4.6L v8 - Vins [y,9] Cadillac Seville IV

ENGINE IDENTIFICATION

Note. For engine repair procedures not covered in this article, see ENGINE OVERHAUL PROCEDURES article in GENERAL INFORMATION.

ENGINE IDENTIFICATION CODES

Scheme 14

COOLING SYSTEM BLEEDING

1. Turn cap in counterclockwise direction until it reaches the stop. DO NOT press down on cap. Wait until any remaining pressure (indicated by a hissing sound) is released. After pressure is released, press down on cap and continue to rotate counterclockwise and remove from surge tank.
2. If system has been drained, add 3 coolant pellets (P/N 3634621) to upper radiator hose. Fill system with about 9.5 qts. (9L) of 50/50 ethylene glycol-water mix by slowly pouring mixture into surge tank until coolant is above weld line or in the indicated safe zone.
3. Install surge tank pressure cap and align arrows on cap with overflow hose. Start engine and check for leaks. With system at operating temperature (about 226° F), heater core circuit and upper left hand corner of radiator core should be hot.
4. If heater core and upper left hand corner of radiator core remain cold, raise engine speed to no more than 2000 RPM, to increase flow until these areas are warm. Shut off engine and allow system to cool.
5. Remove cap and check coolant level. Add Sufficient coolant to bring level slightly above weld line visible inside bottle. Install surge tank pressure cap.

VALVE CLEARANCE ADJUSTMENT

Hydraulic lifters are used. No valve adjustments are required.

TROUBLE SHOOTING

Note. To trouble shoot engine mechanical components, see ENGINE MECHANICAL in BASIC TROUBLE SHOOTING article in GENERAL INFORMATION.

GENERAL PRECAUTION

Note. Most work on engine can only be accomplished with engine removed from vehicle.

Note. For reassembly reference, label all electrical connectors, vacuum hoses and fuel lines before removal. Also place mating marks on engine hood and other major assemblies before removal.

FUEL PRESSURE RELEASE

1. Remove fuel pump fuse B1 in console fuse block. Loosen filler cap to relieve tank pressure. Connect Gauge (J 34730) to fuel pressure connection. Wrap fitting with shop towel while connecting gauge to avoid spillage.
2. Install bleed hose into an approved container and open valve to bleed system pressure. Drain any fuel remaining in gauge into an approved container.

ENGINE

Note. Discharge A/C system using approved refrigerant recovery/recycling equipment.

Removal

1. Scribe line around hinge on inner hood panel to mark hinge for reassembly. Remove hood light connector and hood supports. With the aid of a helper, remove hinge-to-hinge bolts and hood. remove tower-to-tower brace.
2. Disconnect battery and remove air cleaner inlet duct. Drain engine coolant. Remove left and right torque struts. Reinstall bolt in torque strut bracket at left front of engine to be used as an engine lift point.
3. Disconnect radiator hoses at water crossover. Remove both cooling fans. Remove serpentine accessory drive belt. Disconnect cruise control servo connections. Disconnect Idle Speed Control (ISC) motor electrical connector.
4. Hold throttle completely open and push throttle cable toward intake manifold until released. DO NOT kink cable. DO NOT use screwdriver or other sharp tool for removing cable.
5. Disconnect shift cable from park/neutral switch and cable bracket at transmission. Remove park/neutral switch. Disconnect power brake hose. Remove intake manifold. See «INTAKE MANIFOLD & SEALS»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9) .
6. Remove starter motor. Disconnect cylinder head temperature switch at rear of right head. Remove bellhousing bolts. Remove ignition coils and spark plug wires. Raise vehicle.
7. Remove oil pan-to-transmission brace. Remove torque converter splash shield and remove 4 converter-to-flywheel bolts. Disconnect oil cooler lines at oil filter adapter. Remove A/C compressor mounting bolts and electrical connections. Set compressor aside.
8. Disconnect electrical connections from left side of engine. Move harness from behind exhaust manifold. Remove 2 nuts securing motor mount to engine cradle front crossmember. Remove "Y" pipe.
9. Remove right front wheel and remove crankcase-to-transmission bracket at transmission tail shaft. Disconnect knock sensor. Remove bolt from transmission-to-cylinder head brace at cylinder head. Lower vehicle.
10. Disconnect fuel inlet and return lines using Fuel Line Disconnector (J 37088). Disconnect injector harness connector. Disconnect hoses from coolant reservoir and remove reservoir. Disconnect cam position sensor. Disconnect heater hoses from water pipes at front of right cylinder head.
11. Disconnect battery cable from junction block and remove retainer at cylinder head. Disconnect P/S pump pressure and return lines at pump. Remove P/S line retainer at right front of crankcase. Disconnect rear oxygen sensor. Remove 3 screws securing wiring harness retainer to right cam cover and position harness aside.
12. Connect an engine lifting fixture to engine using support hooks at left rear and right rear of engine. Use torque strut bracket at left front of engine for a third lift point. A load tilting device such as Kent-Moore (J 39456) will provide needed adjustment. Remove engine using caution as space is very limited.

Installation

1. CAREFULLY lower engine lower engine into position and install bellhousing bolts. Loosely install, 2 nuts to motor mount at front of axle, bolt to cylinder head for transmission brace and 4 transmission-to-crankcase bracket bolts. Tighten fasteners to specification. See «TORQUE SPECIFICATIONS»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9__torque-specifications) .
2. To complete installation, reverse removal procedure. Tighten all fasteners to specification.

1. Remove air intake duct from throttle body. Disconnect coolant hoses at throttle body and to coolant reservoir and plug hoses. To avoid spillage, wrap a shop towel around hoses when disconnecting.
2. Mark and disconnect electrical connectors at intake manifold. Disconnect vacuum hoses at brake booster, fuel pipe bundle and to body. Disconnect PCV hose at intake manifold. Disconnect accelerator cable at throttle body and position aside.
3. Relieve fuel system pressure. See «FUEL PRESSURE RELEASE»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9__fuel-pressure-release). Disconnect fuel pipe quick connects at fuel pipe bundle in engine compartment. Remove EVAP solenoid bracket at rear cam cover. Reposition transaxle range control cable away from cruise control servo.
4. Remove 4 intake manifold bolts and lift intake manifold, with throttle body, out of engine compartment. Remove intake manifold seals and spacers at cylinder heads. Remove fuel pipe retainer at ISC bracket. Remove 4 throttle body bolts and separate throttle body from intake manifold. (Scheme 15)

Scheme 15

1. Position NEW throttle body "O" ring seal on throttle body with petroleum jelly. CAUTION: DO NOT reuse old throttle body "O" ring seal. DO NOT use silicone lubricants on throttle body "O" ring seal.
2. To complete installation, reverse removal procedure using NEW manifold seals if removed. Tighten intake manifold and intake manifold cover to specification. (Scheme 16) See «TORQUE SPECIFICATIONS»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9__torque-specifications).

Scheme 16

Removal (Left)

1. Remove cradle beauty panel. Remove air cleaner assembly. Disconnect left and right engine torque struts and position aside. Remove engine cooling fans. Install engine support fixture (J 28467-A). Raise vehicle on hoist.
2. Remove 2 nuts securing motor mount to engine cradle. Remove 2 bolts securing motor mount bracket to crankcase. Remove 2 bolts securing motor mount bracket to cylinder head. Remove 2 nuts securing motor mount to motor mount bracket. Remove 2 bolts securing "Y" pipe to converter and reposition converter aside. Lower vehicle.
3. Raise engine by adjusting engine support fixture. Remove motor mount and bracket. Raise vehicle.
4. Remove 4 bolts securing rear generator bracket. Remove 2 bolts at manifold outlet flange. Remove exhaust manifold bolts and remove manifold and gasket. Discard gasket if damaged.

Installation (Left)

For installation, reverse removal procedure.

1. Remove engine. See «ENGINE»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9__engine). Remove intake manifold, cam covers, harmonic balancer, front cover and oil pump. See «INTAKE MANIFOLD & SEALS»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9), «CAM COVER(S)»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9), «HARMONIC BALANCER»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9), «FRONT COVER»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9) and «OIL PUMP»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9).
2. Remove chain tensioner from timing chain for head being removed. Remove cam sprockets from head being removed (timing chain remains in chain case). Remove timing chain guides (Access retaining screws through plugs at front of cylinder head).
3. Remove water crossover. Remove exhaust manifold. See «EXHAUST MANIFOLD»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9). Remove cylinder head bolts in reverse order of tightening sequence. (Scheme 17) Remove cylinder head and gasket.

Note. The following installation procedure includes information from General Motors technical service bulletin, 99-06-010106.

1. Install head with NEW head gasket. Lube washers and underside of bolt heads with engine oil before installation. Tighten head bolts to specification. See «TORQUE SPECIFICATIONS»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9__torque-specifications). (Scheme 17) To complete installation, reverse removal procedure.

Scheme 17

Removal & Installation

Remove serpentine belt. Remove bolt securing power steering hose. Remove harmonic balancer. See HARMONIC BALANCER . Remove belt tensioner. Remove belt idler pulley. Remove front cover and gasket (Gasket is reusable. DO NOT discard unless damaged). For installation, reverse removal procedure.

Remove harmonic balancer. See HARMONIC BALANCER . Pry out seal with a screwdriver or pry bar.

Lubricate seal lips with engine oil and position seal with garter spring toward engine. Using Seal Installer (J 38818) with Harmonic Balancer Installer (J 39344), push seal into front cover until installer bottoms. To finish installation, reverse removal procedure.

1. Rotate engine to TDC No. 1 cylinder. Remove front cover. See «FRONT COVER»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9) . Remove right hand cam cover. See «CAM COVER(S)»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9) . Remove right hand secondary chain tensioner.
2. Remove right hand chain guide. Access upper chain guide mounting bolt through hole in cylinder head covered with plastic plug.
3. Remove right hand cam sprocket bolts and sprockets. Remove secondary drive chain. Repeat steps 1)
4. to remove left hand chain.

Retime camshafts. See CAMSHAFT . Install front cover. See FRONT COVER . Install cam cover(s). See CAM COVER(S) .

Remove front cover. See FRONT COVER . Remove 2 tensioner mounting bolts. Remove tensioner.

Scheme 18

1. Before installation, tensioner must be collapsed. Rotate ratchet release lever counterclockwise and hold. (Scheme 18)
2. Collapse tensioner shoe and hold. Release ratchet lever and slowly release pressure on shoe. As ratchet lever moves to first click, hold tensioner shoe inward and insert a pin through hole in release lever. (Scheme 18)
3. Locked ratchet mechanism should hold shoe in collapsed position. Install tensioner and bolts and tighten to specification. See «TORQUE SPECIFICATIONS»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9__torque-specifications). Remove retaining pin allowing tensioner shoe to extend. Install front cover. See «FRONT COVER»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9).

CAMSHAFT PRIMARY CHAIN

Note. SMU - Section 6A2 - Engine Mechanical - Revised Camshaft #47-61-02 included.

1. Remove engine assembly and place on engine stand. See «ENGINE»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9__engine) . Remove serpentine drive belt, idler pulley and belt tensioner. Remove front cover and oil pump See «FRONT COVER»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9) and «OIL PUMP»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9) . Remove cam covers. See «CAM COVER(S)»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9) .
2. Remove 3 timing chain tensioners. Remove camshaft sprocket bolt from all 4 camshafts and remove sprockets. Remove secondary drive chains from intermediate shaft sprocket.
3. Remove bolt from intermediate shaft sprocket and slide gears and primary drive chain off crankshaft and intermediate shaft. Unless wear is evident, it is unnecessary to remove intermediate shaft.

1. Retime camshafts. See «CAMSHAFT»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9) . Install front cover. See «FRONT COVER»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9) . Install cam cover(s). See «CAM COVER(S)»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9) .

Removal (Left Cover)

1. Disconnect battery. Partially drain coolant from radiator. Disconnect upper radiator hose at water crossover. disconnect spark plug wires.
2. Remove right hand fan. Disconnect battery cable at generator. Disconnect cable harness cup at cam cover and position aside. Disconnect PCV fresh air tube from cam cover.
3. Remove left and right torque struts. Disconnect water pump drive belt. Using Pulley Remover (J 38825), remove water pump pulley. Remove camshaft seal retainer screws and remove seal. Disconnect battery cable retainer at front of cam cover. Remove cam cover screws.
4. Remove cam cover by moving cam drive end of cover up and then pivot entire cover around water pump drive shaft. Continue moving cover upward and pivoting so that edge of cover closely follows left edge of intake manifold cover. (Scheme 19)and (Scheme 20). Discard cover seal if there is any evidence of damage or if seal comes out of groove in cover during removal. Spark plug seals may be reused if undamaged.

Scheme 19

Scheme 20

Installation (Left Cover)

1. Install spark plug and cam cover seals as required. Insert intake cam through hole in cam cover and, using fingers, guide cam cover up over edge of cylinder head. (Scheme 19)and (Scheme 20). Use care to prevent exposed section of cam cover seal from being damaged by edge of cylinder head casting. Work cover into position by allowing top edge of cover to follow left hand edge of intake manifold.
2. Install cam cover screws and tighten to specification. See «TORQUE SPECIFICATIONS»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9__torque-specifications). To complete installation, reverse removal procedure. Install water pump pulley using Pulley Installer (J 38823). Tighten all fasteners to specification.

Removal (Right Cover)

1. Disconnect Battery. Raise vehicle and disconnect exhaust "Y" pipe at converter. Position converter aside. Lower vehicle.
2. Remove tower-to-tower brace. Disconnect Distributorless Ignition System (DIS) wiring connectors (4) and mounting bolts (5). Remove DIS and right bank spark plug wires. Disconnect PCV valve.
3. Remove purge canister solenoid from rear of cover. Remove 3 screws securing wiring harness to cover. Remove cam cover screws.
4. Support front of engine cradle and remove 2 mounting screws at front of cradle. Remove left and right torque struts. Lower cradle (or raise vehicle) to provide clearance at rear of engine compartment. Remove cam cover. Discard cover seal if there is evidence of damage or if seal comes out of groove in cover during removal. Spark plug seals may be reused if undamaged.

Installation (Right Cover)

For installation, reverse removal procedure. Tighten all fasteners to specification. See TORQUE SPECIFICATIONS .

Scheme 21

1. Remove cam cover(s). See «CAM COVER(S)»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9). Secure cam sprocket to timing chain using tie wraps through cam sprocket holes (2 tie wraps per sprocket). CAUTION: Sprocket/chain relationship must be maintained throughout this procedure or camshaft timing will be lost and require further engine disassembly to retime.
2. Working behind sprockets, install Cam Chain Holder (J 38815) so it is positioned between chain tensioner and chain guide. (Scheme 21) Apply tension to holder by tightening tension adjusting screw.
3. Remove both cam sprocket bolts. (Note and mark location of cam drive pins in end of camshafts). Work sprockets off cams using play in chain.
4. Alternately loosen cam bearing cap screws a few turns at a time until all valve spring pressure has been released. Remove bolts and caps. Remove camshafts.

Inspection

Whenever a camshaft is removed the lobes should be visually checked. Excessive wear, scoring or flaking of the lifter will usually denote camshaft lobe wear. Excessive camshaft lobe wear is evidenced by grooves, scoring or flaking. Camshaft should be replace if any of these conditions exist. Bearing journals should not be scored or burned.

1. Apply prelube (1052365) to face of each cam lobe. Position camshaft and bearing caps on head. Loosely install bearing cap bolts. NOTE: Each cap is identified for position and direction. Arrow points to front of engine. "E" indicates exhaust cam. "I" indicates intake cam. Position No. 1 is toward front of engine.
2. Alternately tighten bearing cap bolts a few turns at a time until all bolts are snug. Tighten bolts to specification. See «TORQUE SPECIFICATIONS»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9__torque-specifications) .
3. Use hex cast into camshaft to adjust cams until drive pins are in position to engage cam sprockets over cams and then start retaining bolts. Work sprockets over cams and tighten retaining bolts to specification. To finish installation, reverse removal procedure.

Scheme 22

Note. Setting camshaft timing is necessary whenever cam drive system has been disturbed such that the relationship between any chain and sprocket has been lost. Even when only one sprocket is involved the timing procedure should be observed since one crankshaft revolution will not confirm correct timing.

Note. The camshafts and crankshaft are correctly timed when the relationships shown in Fig. (Scheme 23) exist. Correct timing exists when crank sprocket and intermediate shaft sprocket have their timing marks aligned and all 4 camshaft drive pins are perpendicular to cylinder head surface. (Scheme 23)

Scheme 23

1. Remove cam covers. See «CAM COVER(S)»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9). Remove front cover. See «FRONT COVER»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9). Remove or fully retract all 3 chain tensioners. Remove oil pump. See «OIL PUMP»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9) under ENGINE OILING.
2. Primary and secondary chain guides should remain in place. Rotate crankshaft until sprocket drive key is positioned at about 1 o'clock.
3. Set crankshaft and intermediate shaft sprockets into primary drive chain with their timing marks adjacent to each other. (Scheme 23)
4. Install crank and intermediate sprockets over their respective shafts. Rotate crankshaft as necessary to engage crankshaft key in sprocket without changing the timing mark relationship.
5. Install Flywheel Holder (J 39411) to lock crankshaft in position. (If engine is on stand, an alternate locking method should be devised. Install intermediate sprocket retaining bolt and tighten to specification. See «TORQUE SPECIFICATIONS»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9__torque-specifications).
6. Route secondary chain for left hand cylinder head over inner row of intermediate shaft teeth. Route secondary drive chain over chain guide and install exhaust cam sprocket to chain so that camshaft drive pin engages sprocket notch marked LE (left head exhaust). There should be no slack in lower section of chain and cam drive pin must be perpendicular to cylinder head face. (Scheme 23)
7. Install intake cam sprocket into chain so the sprocket notch marked LI (left head intake) engages cam drive pin while pin remains perpendicular to head face. Minor cam positioning adjustments can be made using open end wrench on hex cast into camshaft.
8. Install sprocket retainer bolts and chain tensioner and tighten to specification. See «TORQUE SPECIFICATIONS»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9__torque-specifications).
9. Route secondary chain for right hand cylinder head over outer row of intermediate shaft teeth and repeat steps No. 6) 8). Right hand cam sprockets are identified RI (right intake) and RE (right exhaust). In addition, RE sprocket must contain cam position sensor pickup.

1. Release tension from accessory drive belt. Raise vehicle on hoist. Remove right front wheel. Remove 2 splash shields from wheelhouse. Remove brace between engine oil pan and transmission case and install Flywheel Holder (J 39411). Remove balancer bolt.
2. Support engine cradle with tall screw jack and remove 3 engine cradle bolts on right side of cradle. Disconnect Road Sensing Suspension (RSS) sensor from right hand lower control arm.
3. Lower engine cradle to obtain clearance for Puller (J 34816) below body rail. Install pilot into end of crankshaft. Remove harmonic balancer using Puller (J 38416).

Position balancer on crankshaft and install using Installer (J 39344). Clean and oil balancer bolt threads and tighten to specification. See TORQUE SPECIFICATIONS . To complete installation, reverse removal procedure.

Scheme 24

1. Remove engine and mount on stand. See ENGINE. Remove oil pan, oil pump, oil pump pickup, oil baffle, main bearing bolts, oil manifold bolts, oil manifold and upper/lower crankcase bolts.
2. Working on either side of crankcase, separate crankcase halves by alternately prying in grooves provided until lower crankcase is free of dowel pins. Remove lower crankcase. (Scheme 24) NOTE: Upper-to-lower crankcase seal may be reused unless damaged or removed from its groove in upper crankcase.
3. Remove rear main seal and discard. Remove lower main bearings from lower crankcase. Remove upper main bearings by rolling out with aluminum pin inserted in oil hole of crank journal.

1. Install lower main bearing into lower crankcase. Install upper main bearing into upper crankcase. Ensure upper bearing has oil transfer hole. Roll bearing into position so lock tang engages crankcase slot. Bearing must fit flush with crankcase.
2. Inspect upper crankcase seal to ensure it is in position in crankcase. Seal must not be torn, nicked or out of groove over its entire length on both sides of crankcase.
3. Clean block groove. Start seal at both ends and work seal into groove toward center. Lower crankcase over dowels. Wiggle into installed position.
4. Install oil manifold. Install 20 main bearing bolts (inboard bolts have stud heads). Install 10 oil manifold bolts. Install 8 upper-to-lower crankcase bolts. Tighten bolts to specification. See «TORQUE SPECIFICATIONS»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9__torque-specifications). (Scheme 25)
5. Check crankshaft end play. End play should not exceed.019" (.50 mm). Install oil baffle and 10 nuts. Tighten to specification. See «TORQUE SPECIFICATIONS»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9__torque-specifications).
6. Install oil pump pickup using NEW "O" ring. To complete installation, reverse removal procedure.

Scheme 25

1. Remove transmission. For 1993, see «REMOVAL & INSTALLATION - A/T»(/cadillac/seville/iv-1992-1997/remont/automatic-trans/#removal-installation-at) article in TRANSMISSION SERVICING. For 1994, see «REMOVAL & INSTALLATION - A/T (4T80)»(ref-56084) article in TRANSMISSION SERVICING. Remove flywheel.
2. Preferred method of seal removal is by drilling an 1/8" hole in metal seal body and removing with a body dent puller (slide hammer).
3. Seal removal with a screwdriver blade between seal lips and crankshaft is also possible but extreme care is required to avoid damage to crankshaft sealing surface.

1. Place a small dab of RTV sealant at crankcase split line between upper and lower cases. Lubricate seal lips with engine oil and slide seal over arbor of Seal Installer (J 38817).
2. Thread seal installer into crankshaft flange and install seal by turning handle until installer bottoms against crankshaft. To complete installation, reverse removal procedure.

1. Disconnect the negative battery cable.
2. Drain the cooling system.
3. Remove the upper tie bar.
4. Disconnect the electrical connectors from the cooling fans.
5. Remove the cooling fans by disconnecting the wiring harness from the motor and the fan frame. Remove the fan guard and the hose support as needed.Remove the fan assembly from the radiator support.
6. Disconnect the electrical connector from the coolant level sensor.
7. Disconnect the radiator inlet and the outlet hoses from the radiator.
8. Remove the bolts from the condenser.
9. Disconnect the transaxle cooler lines from the radiator.
10. disconnect the engine oil cooler lines from the radiator if equipped.
11. Remove the radiator.

1. Install the radiator in the vehicle. Locate the bottom of the radiator on the lower mounting pads.
2. Connect the transaxle oil cooler lines to the radiator. Tighten the transaxle oil cooler lines to 13 ft. lbs. (18 N.m).
3. Connect the engine oil cooler lines to the radiator if equipped. Tighten the engine oil cooler lines to 10 ft. lbs. (14 N.m).
4. Install the bolts to the condenser.
5. connect the radiator inlet and the outlet hose to the radiator.
6. Install the cooling fans.
7. Connect the electrical connectors to the cooling fans.
8. Ensure the radiator to condenser and radiator to upper tie bar seals are in place. Install the upper tie bar assembly. Tighten the tie bar assembly bolts to 89 INCH lbs. (10 N.m).
9. Refill the cooling system.
10. Check the transaxle fluid. Refill the transaxle fluid if necessary.
11. Start the engine. Check for leaks.

THERMOSTAT

1. Drain the coolant.
2. Disconnect the negative battery cable.
3. Remove the air intake duct.
4. Disconnect the radiator hose.
5. Remove the thermostat housing.
6. Remove the thermostat. Clean all sealing surfaces

Note. Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

1. Install the thermostat.
2. Install the thermostat housing using a new gasket.
3. Install the thermostat housing bolts. Tighten the thermostat housing bolts to 89 INCH lbs. (10 N.m).
4. Connect the radiator hose.
5. Install the air cleaner outlet duct.
6. Refill the coolant.
7. Start the engine.
8. Check for leaks.

WATER PUMP

Note. Water Pump Remover/Installer (J 38816) is required to turn pump assembly.

Drain cooling system. Remove air cleaner. Remove water pump cover (4 bolts). Remove water pump drive belt. Using Remover/Installer (J 38816), rotate water pump assembly clockwise and remove from vehicle. (Scheme 26)

Scheme 26

Clean water pump assembly and pump housing sealing surfaces. Using a NEW "O" ring, install water pump assembly and tighten counterclockwise to 74 ft.lbs. (100 N m.) To complete installation, reverse removal procedure. Tighten water pump cover bolts (4) to specification. See TORQUE SPECIFICATIONS

OIL PAN

Note. The engine oil pan removal procedure for 1993 Cadillac Allante, Eldorado and Seville has been revised due to TSB 43-61-05 dated 06/10/1994. The removal procedure below reflects those changes. It is necessary to remove either the engine or transmission to allow for engine oil pan removal.

1. Engine oil pan removal is possible using 2 procedures. If removing engine to allow for engine oil pan removal, see «ENGINE»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9__engine) . If removing transaxle to allow for engine oil pan removal, For 1993, see «REMOVAL & INSTALLATION - A/T»(/cadillac/seville/iv-1992-1997/remont/automatic-trans/#removal-installation-at) article in TRANSMISSION SERVICING. For 1994, see «REMOVAL & INSTALLATION - A/T (4T80)»(ref-56084) article in TRANSMISSION SERVICING.
2. Drain engine oil. Remove engine oil pan bolts and engine oil pan. Gasket is reusable unless damaged. DO NOT remove gasket from engine oil pan unless replacement is required.

Install NEW engine oil pan gasket, if required, by starting seal into pan groove and working seal into groove in both directions. Once seal is exposed to oil it will expand and no longer stay in groove without wrinkles. If wrinkles exist, replace with NEW seal. To complete installation, reverse removal procedure. Tighten fasteners to specification. See TORQUE SPECIFICATIONS. (Scheme 27)

Scheme 27

OVERHAUL

Note. For engine repair procedures not covered in this article, see ENGINE OVERHAUL PROCEDURES article in GENERAL INFORMATION.

Cylinder Head

Note. The cylinder head inspection procedure includes updated information from General Motors technical service bulletin 47-61-21 included..

When measuring cylinder head for flatness, measure along each edge, at center and across both ends. If warpage is less than.002" (.05 mm) head does not require resurfacing. If warpage is between.002-.008" (.05-.20 mm), resurface head. When resurfaced, dimension between combustion chamber gauge pad and deck surface must be at least.335" (10.5 mm). (Scheme 28)and (Scheme 29).

Scheme 28

Scheme 29

Valve Springs

1. Measure valve spring free length and tension (pressure). Replace valve spring if free length and tension are not within specification. See «VALVES & VALVE SPRINGS»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9) table under ENGINE SPECIFICATIONS.

Valve Stem Oil Seals

Install Lifter Bore Protector (J 38820-2) and, using Remover/Installer (J 38820), grip valve stem seal/seat assembly. Remove seal by exerting a twisting, pulling motion. Discard seal. Lubricate NEW seal with engine oil and, using remover/installer, with a twisting, pushing motion install new seal.

Valve Guides

Check valve stem clearance using a hole gauge and outside micrometer. Measure inside diameter of guide with hole gauge, crosswise to engine, at top and .394" (10 mm) from bottom of guide, measuring gauge each time with micrometer. A standard valve guide is .235" (5.979 mm). Measure valve stem with micrometer and subtract from greater of 2 guide measurements to obtain maximum clearance. If clearance is greater than .0005" (.12 mm) action is indicated. If a NEW standard diameter valve stem doesn't bring clearance within tolerance, cylinder head must be replaced. Valve guide wear in the bottom .394" (10 mm) of valve guide is not significant to normal operation.

Valve Seat

Manufacturer does not recommend seat replacement.

Valves

Measure valve head diameter, stem diameter and margin. Replace valve if head diameter, stem diameter or margin are not within specification. See VALVES & VALVE SPRINGS table under ENGINE SPECIFICATIONS. DO NOT lap NEW valves, as protective coating will be damaged. Lightly lap reused valves.

Valve Seat Correction Angles

After grinding, if seat is too wide, use 20-degree and/or 70-degree stones to narrow the seat.

Fitting Pistons

Measure piston diameter 1.81" (46 mm) below top of piston at 90-degree angle to piston pin. Measure cylinder bore 2" (51 mm) below top of cylinder. If piston clearance is not to specification, replace piston. See PISTONS, PINS & RINGS table under ENGINE SPECIFICATIONS.

Piston Rings

Note. Piston ring installion contains updated information from General Motors technical service bulletin 67-61-08.

Each piston has 2 compression rings and a side-seal type oil ring that incorporates a steel expander and 2 identical chrome plated steel rails. Top compression ring is molybdenum filled steel. Second compression ring is coated cast iron. When replacing piston rings, install only re-ring sets that have molybdenum filled upper compression ring and multi-piece oil rings. Top compression ring may be installed either side up. Second compression ring has a locating dimple identifying top side. Measure piston ring end gap and side clearance. If end gap and side clearance are not to specification, replace rings and/or piston. Whenever removal and installation of the piston rings of a 4.6L Northstar or 4.0L Aurora engine is necessary, you must install the oil ring expander with the ends of the expander facing toward the top of the piston. See PISTONS, PINS & RINGS table under ENGINE SPECIFICATIONS. Ensure ring end gaps are correctly spaced around piston. (Scheme 30)and (Scheme 31).

Scheme 30

Scheme 31

Rod Bearings

Ensure tangs on bearings are positioned in notches on rod and cap before tightening cap nuts. Measure rod bearing oil clearance. Replace bearing if clearance exceeds specification. See CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS table under ENGINE SPECIFICATIONS.

Crankshaft & Main Bearings

Shell type main bearings of steel backed aluminum are used at all positions. Upper halves are interchangeable, as are the lower halves except for the bearings in No. 3 position (thrust bearing). To service main bearings, engine must be removed from vehicle. See CRANKSHAFT MAIN BEARINGS under REMOVAL & INSTALLATION.

Thrust Bearing

To measure crankshaft end play, pry crankshaft to extreme forward position. Using feeler gauge, measure distance between crankshaft thrust face and thrust face of No. 3 bearing (front side of bearing). When using a dial indicator, mount indicator on block beside flywheel flange and measure crankshaft movement when prying crank back and forth. If not within specification, replace thrust bearing and/or crankshaft as necessary. See CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS table under ENGINE SPECIFICATIONS.

Cylinder Block

Cylinder block deck warpage information is not available from manufacturer.

Description

Gerotor oil pump is mounted to lower crankcase behind front cover and drive is furnished by the clamp load on harmonic balancer from its mounting bolt. Pump draws oil from sump through sump pickup and cast-in channels to pump. Oil, pressurized by pump, enters lower crankcase distribution channel through pump outlet. Oil is routed through oil filter/cooler circuit to the engine.

Scheme 32

Crankcase Capacity

Oil capacity is 7.5 qts. (7.0L) with filter.

Oil Pressure

Oil pressure is 5 psi (35 kPa) at idle and 35 psi (250 kPa) at 2000 RPM.

Scheme 33

1. Remove front cover. See «FRONT COVER»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9) under REMOVAL & INSTALLATION. Remove 3 oil pump mounting bolts. (Scheme 33) Remove pump and drive gear.
2. Remove drive spacer from pump housing. Remove 2 screws holding pump halves together. Remove inner (drive) and outer (driven) rotors from housing and mark for reassembly. Remove pressure relief valve. (Scheme 34)

Scheme 34

Inspect pump housing for nicks, burrs, chips or debris that might cause a leak or binding in rotor pocket. Inspect drive and driven rotors for nicks or burns. Check pump cover and interior surface for excessive wear or score marks. Check for flatness.

1. Lubricate rotors with engine oil and install in pump cover with same orientation as when removed. Install pressure relief valve seat, spring and pilot in pump housing.
2. Assemble housing and cover over locating dowel. Insert 3/8" (9.5 mm) drill bit into the pump mounting hole on side opposite dowel, to aid alignment of housing and cover. Install 2 screws and tighten to 106 INCH lbs. (12 N.m).
3. Install oil pump drive spacer into oil pump from rear so drive flat engages pump rotor. Position pump over crankshaft. Loosely install screws. Hold pump in its furthest up position while tightening screws. Tighten screws to specification. See «TORQUE SPECIFICATIONS»(/cadillac/seville/iv-1992-1997/remont/mechanical/#46l-v8-vins-y9__torque-specifications) . To complete installation, reverse removal procedure.

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

ENGINE SPECIFICATIONS

GENERAL SPECIFICATIONS

CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS

CONNECTING RODS

PISTONS, PINS & RINGS

CYLINDER BLOCK

VALVES & VALVE SPRINGS

CYLINDER HEAD

CAMSHAFT

See also:
• ENGINE OVERHAUL PROCEDURES
• ENGINE MECHANICAL
• COMPUTER RELEARN PROCEDURES
• REMOVAL & INSTALLATION - A/T
• INTAKE MANIFOLD & SEALS
• TORQUE SPECIFICATIONS
• FUEL PRESSURE RELEASE
• ENGINE