Engine Mechanical 5.7l v8 - VIN [P] Chevrolet Caprice Impala SS

ENGINE IDENTIFICATION

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

Engine can be identified by eighth character of Vehicle Identification Number (VIN) which is stamped on a metal pad, located near lower left corner of windshield. See ENGINE IDENTIFICATION CODES table. An "S" in tenth character of VIN indicates 1995 model year.

Engine can also be identified by a 3-character engine code (RPO code). See ENGINE IDENTIFICATION CODES table. This code may be stamped on engine, at flange where engine and transmission meet.

ENGINE IDENTIFICATION CODES

VALVE CLEARANCE ADJUSTMENT

Note. Engine is equipped with hydraulic valve lifters. Adjustment is required only if valve train has been disassembled.

Remove rocker arm covers. Rotate crankshaft until cylinder No. 1 is at TDC of compression stroke. Begin by adjusting exhaust valve of cylinder No. 1. See VALVE CLEARANCE ADJUSTMENT SEQUENCE table. While trying to rotate push rod with thumb and forefinger, loosen nut on rocker stud until push rod just starts to rotate. This is considered zero lash. Tighten nut 3/4 - 1 1/4 turns (this centers the lifter plunger).

VALVE CLEARANCE ADJUSTMENT SEQUENCE

NOTES

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

DRAINING & REFILLING COOLING SYSTEM

The draining procedure is first, followed by the refilling/bleeding procedure. The two procedures can be used independantly of each other.

Draining the Cooling System

1. Park the vehicle on level surface. Remove the coolant recovery reservoir filler cap assembly: Slowly rotate cap counterclockwise about 1/4 turn and then stop. Wait until any remaining pressure (indicated by a hissing sound) is relieved. After all hissing ceases, continue to rotate cap assembly counterclockwise until cap is removed.
2. Open coolant drain valve located in left-hand radiator end tank. Disconnect the battery negative cable assembly. Open heater air bleed valve (36) located just above water pump assembly on the thermostat housing. (Scheme 12) Place a shop towel under the bleed valve to prevent coolant from splashing onto distributor assembly.
3. Remove both electronic spark control (ESC) knock sensors located on both sides of engine block assembly. Allow system to drain completely.
4. Store used coolant in a proper fashion, i.e., in a used coolant holding tank. NOTE: NEVER POUR USED COOLANT DOWN THE DRAIN! Ethylene Glycol antifreeze is a very toxic chemical; disposing of it into the sewer system or ground water is both illegal and ecologically unsound!
5. Close coolant drain valve on radiator. Install ESC knock sensors. Tighten each knock sensor to 14 ft.lbs (19 N.m).

Refilling/Bleeding the Cooling System

1. If not already open, open heater air bleed valve (36) located just above the water pump assembly on the thermostat housing. (Scheme 12) Place a shop towel under the bleed valve to prevent coolant from splashing onto distributor assembly.
2. Fill cooling system through the coolant recovery reservoir assembly to the "FULL COLD" mark. Use Ethylene Glycol antifreeze meeting GM specification 2025-M to provide required freezing and corrosion protection; at least a 50% solution. For fluid capacity, see the «COOLING SYSTEM APPROXIMATE FLUID CAPACITIES TABLE»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p).
3. Add two engine coolant supplement sealant pellets (GM P/N 363462) or equivalent.
4. Close heater air bleed valve when bubbles disappear and only coolant is visible. Run engine with the coolant recovery reservoir filler cap off until thermostat assembly opens.
5. Re-open heater air bleed valve. When bubbles disappear and only coolant is visible, close heater air bleed valve. Again, place a shop towel under the bleed valve to prevent coolant from splashing onto distributor assembly.
6. Fill cooling system through the coolant recovery reservoir until the coolant level is approximately 1 inch (25 mm) above the "FULL COLD" mark.
7. Install the coolant recovery reservoir filler cap assembly. Inspect for leaks after running engine until normal operating temperature is reached.

Note. The "LOW COOLANT" warning/indicator lamp may come on after this procedure. It can take up to THREE engine heat up/cool down cycles before the light goes out! If the "LOW COOLANT" warning/indicator lamp still does not go out and coolant is above "FULL COLD" mark in reservoir assembly, there is a fault with the circuit. Troubleshoot and repair as necessary.

Note. If at any time the "TEMP" warning/indicator lamp comes on, immediate action is required. Turn off engine and allow vehicle to cool. Do not remove coolant recovery cap at this time.

COOLING SYSTEM APPROXIMATE FLUID CAPACITIES

Scheme 12

FUEL PRESSURE RELEASE

Disconnect negative battery cable. Loosen fuel tank filler cap. Connect Fuel Gauge (J-34730-1) to fuel pressure connection (wrap shop towel around fitting to avoid spillage). Install bleed hose. Turn gauge valve, and drain fuel into an appropriate container.

Removal (Caprice, Fleetwood, Impala SS & Roadmaster)

1. This procedure involves removing engine without transmission. Release fuel pressure. See «FUEL PRESSURE RELEASE»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p__fuel-pressure-release) . Disconnect negative battery cable. Discharge A/C system using approved refrigerant recovery/recycling equipment.
2. Drain coolant. Remove air cleaner resonator and air intake duct. Disconnect fuel lines from fuel rail assembly. On vehicles with mechanically driven fan, remove radiator fan upper shroud, fan, and fan pulley.
3. On all vehicles, disconnect heater hose from water pump. Disconnect control cables from throttle body. Disconnect radiator hoses from engine. Disconnect coolant hose from throttle body. Raise and support vehicle. Disconnect oil filter adapter hoses. Drain crankcase.
4. Disconnect exhaust pipes from manifolds. Remove cover and torque converter bolts (A/T). Remove serpentine drive belt. Disconnect A/C hoses from compressor. Plug openings. Disconnect transmission fluid cooler lines from clips (A/T).
5. Remove radiator fan lower shroud (or electric cooling fans, if equipped). Disconnect electrical connectors from starter, knock sensor, oxygen sensor, oil level sensor, and oil pressure sensor. Lower vehicle. Disconnect power steering hoses from pump.
6. Disconnect brake booster vacuum hose. Disconnect wiring from alternator and remaining components as necessary. Raise and support vehicle. Remove bolts securing transmission to engine. Remove transmission filler tube bolt. Remove engine mount through-bolts. Lower vehicle. Support transmission. Attach lifting device to engine. Remove engine.

Installation

To install, reverse removal procedure. Fill crankcase. Fill and bleed cooling system. See REFILLING/BLEEDING THE COOLING SYSTEM under DRAINING & REFILLING COOLING SYSTEM . Fill and bleed power steering system. Evacuate and charge A/C system.

Removal

1. Disconnect negative battery cable, and drain cooling system. Relieve fuel pressure. See «FUEL PRESSURE RELEASE»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p__fuel-pressure-release) . Remove air intake duct assembly and fuel rail covers. Disconnect throttle and cruise control cables. Mark and disconnect necessary electrical connectors and vacuum hoses.
2. Remove heater hoses. Remove AIR diverter valve hoses. Disconnect fuel pressure regulator vacuum hose. Remove fuel injectors and fuel rail from intake manifold, and position aside.
3. Remove PCV valve and hose. Remove EGR solenoid bracket and EGR valve. Remove fuel vapor canister purge solenoid bracket and solenoid. Remove AIR pipe from intake manifold and right exhaust manifold.
4. Remove alternator brace. Remove throttle body and gasket. Remove intake manifold and gaskets.

Clean gasket surfaces. Apply 3/16" bead of RTV Sealer (1052289) to front and rear of cylinder block, and run the same bead 1/2" onto each cylinder head. Install gaskets and intake manifold. Tighten bolts and studs to specification in sequence. (Scheme 13) Refer to TORQUE SPECIFICATIONS. To complete installation, reverse removal procedure. Adjust timing (if necessary) and check for leaks.

Scheme 13

Removal (Left)

1. Disconnect negative battery cable. Raise and support vehicle. Remove catalytic converter from exhaust manifold. Remove exhaust system from vehicle. Lower vehicle. Remove air intake duct. Remove serpentine belt. Remove left wheelwell center panel. Remove A/C compressor and alternator and position aside.
2. Remove exhaust crossover pipe at exhaust manifold. Lower vehicle. Remove air cleaner. Remove spark plug wires and clips. Remove air injection pipe and check valve as an assembly. Remove exhaust manifold heat shields, exhaust manifold and gasket.

Removal (Right)

1. Disconnect negative battery cable. Raise and support vehicle. Remove catalytic converter from exhaust manifold. Remove exhaust system from vehicle. Lower vehicle. Remove fuel rail covers. Remove fuel injector electrical connectors. Remove fuel pressure regulator vacuum hose. Remove fuel injectors and fuel rail from intake manifold.
2. Lower vehicle. Remove air cleaner. Remove air injection hoses. Mark and disconnect spark plug wires at spark plugs. Remove necessary accessory brackets.
3. Remove oil indicator and tube. Remove exhaust manifold and gasket (if equipped).

Installation (Left & Right)

To install, reverse removal procedure. Tighten studs/bolts to specification. See TORQUE SPECIFICATIONS .

CYLINDER HEAD

1. Disconnect negative battery cable. Remove intake manifold, exhaust manifold and valve covers. See the following: «INTAKE MANIFOLD»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p) «EXHAUST MANIFOLD»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p) «VALVE COVERS»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p)
2. Remove serpentine belt. Drain cooling system. Remove rocker arms and push rods (mark components for installation reference). Remove cylinder head bolts in 3 steps in reverse order of tightening sequence. (Scheme 14) Remove cylinder head and gasket.

Inspection

See CYLINDER HEAD under OVERHAUL.

1. Clean cylinder head bolt holes and threads. Coat steel-type head gaskets with sealer. DO NOT coat composition-type head gaskets with sealer. Install head gasket onto cylinder block. Install cylinder head. Coat head bolts with Sealing Compound (1052080).
2. Tighten bolts in 3 steps in sequence. (Scheme 14) Tighten bolts to specification. See «TORQUE SPECIFICATIONS»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p__torque-specifications). To complete installation, reverse removal procedure.

Scheme 14

CRANKSHAFT BALANCER PULLEY ASSEMBLY & HUB

Note. For component identification in removal and installation procedures. Refer to illustrations. (Scheme 15)- (Scheme 18).

1. Raise and suitably support vehicle.
2. Remove serpentine drive belt.
3. If equipped with a mechanical fan: remove radiator fan upper shroud. (Scheme 15) Remove bolts and screws (25 and 26) from upper shroud assembly (27). Remove upper shroud assembly (27) from lower shroud assembly (28) and radiator support assembly. Remove fan.
4. Mark fan belt drive pulley to crankshaft balancer pulley, remove pulley. Mark crankshaft pulley to the hub. Remove crankshaft balancer pulley bolts/screws (46) and remove the balancer assembly (42). (Scheme 16)
5. Remove hub only if necessary. Mark crankshaft hub (45) to engine front cover assembly. DO NOT crank engine over after match-marking crankshaft hub and engine front cover assembly. Rotating crankshaft assembly will misalign installation of balancer assembly to crankshaft assembly possibly resulting in engine imbalance.
6. Remove crankshaft hub bolt/screw and washer. Pull crankshaft hub (45) using Crankshaft Hub Remover/Installer (J 39046).

Scheme 15

Scheme 16

Scheme 17

Scheme 18

Note. If balancer assembly is replaced, new balance weights of the same size must be installed on the new balancer assembly in the same hole locations as the old balancer assembly.

The crankshaft hub (45) can be installed by a different procedure if the engine should accidentally be cranked over after match marking the hub and engine front cover assembly.

1. Set number 1 piston assembly to top dead center.
2. Install crankshaft hub (45) with cast arrow on hub in the 12 o'clock position.

Install crankshaft hub (45) using Installer (J 39046). Install crankshaft hub washer and bolt/screw. Install crankshaft balancer assembly (42) and bolts/screws (46). Install fan belt pulley. (Scheme 16) Tighten fasteners to specification. See TORQUE SPECIFICATIONS.

1. Disconnect negative battery cable and serpentine drive belt. Remove crankshaft pulley. Loosen or remove motor mount nuts as necessary for harmonic balancer removal. Remove harmonic balancer-to-crankshaft bolt. Mark position, and remove harmonic balancer using Harmonic Balancer Remover/Installer (J-39046).
2. Remove the oil pan. See «OIL PAN»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p) . Remove the water pump. See «WATER PUMP»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p__water-pump) . Remove throttle body air duct and distributor. Remove front cover and gasket. Carefully pry seal from timing cover using a large screwdriver.

1. Using Seal Aligner/Installer (J-35468), install NEW oil seal in timing cover. Coat timing cover gasket with sealant, and position onto timing cover. Install timing cover.
2. Alternately tighten all bolts to specification. Refer to «TORQUE SPECIFICATIONS»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p__torque-specifications) . Apply sealant to oil pan, cylinder block and timing cover joint. To complete installation, reverse removal procedure.

1. Disconnect the negative battery cable. Remove front cover. See «FRONT COVER & OIL SEAL»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p). Rotate crankshaft until the camshaft sprocket and crankshaft sprocket timing marks line up with the shaft centers. (Scheme 20)
2. Remove camshaft sprocket and chain as an assembly. (Scheme 19) If replacing crankshaft sprocket, use Sprocket Remover (J-5825-A) to pull sprocket off crankshaft. If replacing water pump drive gear, use Gear Remover (J-39243) to remove gear.

Drive crankshaft sprocket onto crankshaft, with timing mark facing out. Ensure timing marks on crankshaft sprocket and camshaft sprocket are as close together as possible and lined up with shaft centers. (Scheme 20) Install camshaft sprocket and chain as an assembly. To complete installation, reverse removal procedure.

Scheme 19

Scheme 20

Disconnect negative battery cable. Remove alternator brace. Remove alternator and position aside. Disconnect AIR diverter valve hose from check valve. Remove fuel rail cover and studs, and position wiring harness aside. Remove fuel lines and brackets. Remove valve cover bolts, washers, valve cover and gasket.

1. Disconnect negative battery cable. Remove fuel rail cover and fuel rail bolts. Disconnect fuel pressure regulator vacuum hose. Remove fuel injectors and fuel rail from intake manifold. Remove fuel rail cover studs, and position wiring harness aside. Remove AIR pipe and check valve from intake and exhaust manifolds.
2. Disconnect ECM harness connectors and position harness aside. Remove AIR diverter valve and hoses. Remove spark plug wires at distributor. Remove EGR solenoid bracket. Disconnect PCV hose and connector. Remove valve cover and gasket.

To install, reverse removal procedure. Tighten bolts and nuts to specification. See TORQUE SPECIFICATIONS .

Removal & Installation

Remove valve covers. See VALVE COVERS . Mark components for installation in original locations. Remove rocker arm nuts, balls, rocker arms and push rods. To install, reverse removal procedure. Apply Prelube (1052365) to rocker arm and ball mating surface.

1. Remove the rocker arms and push rods as necessary. Refer to «ROCKER ARMS & PUSH RODS»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p) . Remove rocker arm stud(s) using Stud Remover (J-5802-01). Ream stud bore to replacement size of oversize stud. Oversize studs are available in .003" (.08 mm) and .013" (.33 mm).
2. Coat press-fit area of stud with hypoid axle lubricant. Install rocker arm stud using Stud Installer (J-6880) until installer bottoms out on cylinder head. To complete installation, reverse removal procedure.

CAMSHAFT

Note. Rotate crankshaft in direction of normal operation only. Keep components in order for installation reference.

1. Remove valve covers and rocker arms. See «VALVE COVERS»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p) . DO NOT remove push rods. See «ROCKER ARMS & PUSH RODS»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p) . Measure lobe lift of camshaft with push rods installed.
2. To measure lobe lift, attach dial indicator to cylinder head. Position indicator pointer onto tip of a push rod. Rotate crankshaft until push rod is at lowest point. Zero indicator, and rotate crankshaft until push rod is at highest point. Record reading, and repeat procedure for remaining lobes.
3. After lobe lift is measured, remove push rods. Remove intake manifold and timing sprockets. See «INTAKE MANIFOLD»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p) . Also refer to «TIMING CHAIN»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p) . Remove air cleaner, coolant reservoir hose from radiator, and relay bracket from left side of radiator support. Remove AIR pump and hoses, and position aside. Disconnect cooling fan electrical connectors. Remove upper radiator support.
4. Remove upper radiator fan shroud. Remove radiator and hoses. Discharge A/C system and remove condenser (if equipped). Remove valve lifters and camshaft retaining plate. Using three 5/16" x 18 tpi x 4" bolts as a handle, carefully pull camshaft from engine. Remove camshaft rear plug and bearings as necessary.

Check camshaft for scratches, pits and loose fit in bearings. Check camshaft journal diameter and lobe lift (recorded earlier). Replace camshaft if damaged or not to specification. See CAMSHAFT table under ENGINE SPECIFICATIONS.

1. Install front and rear bearings. Position camshaft bearing No. 1 oil holes at 1 o'clock and 5 o'clock positions.
2. Position oil hole of rear bearing at 12 o'clock position. Position oil holes of middle bearings at 5 o'clock position, toward left side of engine and even with bottom of cylinder bore.
3. Install camshaft rear plug flush to .031" (.79 mm) deep in block. Use Sealant (1052080) on camshaft plug. If replacing camshaft, replace lifters, engine oil and filter.
4. Apply Camshaft Prelube (1052365) to camshaft lobes. Apply engine oil to bearings and camshaft bearing journals. To complete installation, reverse removal procedure.

Remove transmission. Remove flywheel/flexplate. Pry out seal using screwdriver at notches in seal retainer. (Scheme 21)

1. Coat entire seal with engine oil. Install seal using Seal Installer (J-35621) until installer bottoms. (Scheme 21) Align crankshaft dowel to flywheel hole.
2. Install flywheel/flexplate-to-crankshaft bolts. Tighten bolts to specification. See «TORQUE SPECIFICATIONS»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p__torque-specifications). To complete installation, reverse removal procedure.

Scheme 21

WATER PUMP

The layout of this section is

1. Brief description of the water pump
2. Removal of the water pump; all cooling system types are addressed
3. Cleaning after removal
4. Installation of the water pump

Description

The water pump assembly is gear driven by the camshaft sprocket using a driveshaft and coupling. Keep the ignition wires connected to the distributor assembly until the water pump assembly is removed and all coolant has been drained.

Note. see scheme 11for exploded view of water pump assembly. This illustration is referred to here.

1. Drain engine coolant. See the «DRAINING & REFILLING COOLING SYSTEM»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p__draining-refilling-cooling-system) section in this article
2. If equipped with a mechanical fan: Remove air cleaner resonator bracket nuts. Remove air cleaner resonator assembly; loosen clamp and slide resonator assembly off studs. Remove the air intake duct.
3. If equipped with a mechanical fan: remove radiator fan upper shroud. see scheme 12 Remove bolts and screws (25 and 26) from upper shroud assembly (27). Remove upper shroud assembly (27) from lower shroud assembly (28) and radiator support assembly.
4. If equipped with a mechanical fan: Remove fan belt from tensioner assembly. (Scheme 22)Remove the fan blade clutch nuts (247) and fan blade assembly (249) with clutch assembly attached.
5. For all, remove engine coolant and heater hose assemblies from water pump assembly (37).
6. If equipped with a mechanical fan: Remove fan pulley. Remove coolant fan pulley bracket nuts (132). Remove coolant fan pulley bracket (130)
7. For all, remove the electrical connect from coolant sensor. Remove the secondary air injection pump assembly by removing the electrical connector from AIR pump, outlet and inlet hoses, and finally, the air pump mounting bolts (3) from bracket. (Scheme 23)
8. Remove the water pump bolts/screw (127 and 129) and stud (128). Remove water pump assembly (37) and gaskets (38). Remove water pump driveshaft coupling (39) and seals (156). Discard the seals (156).

Cleaning

Clean the water pump gasket surfaces, the water pump bolts/screws (127 and 129). Clean coolant fan pulley bracket studs (131), if removed.

Note. see scheme 11for exploded view of water pump assembly. This illustration is referred to here.

1. Install the water pump driveshaft coupling (39) and new seals (156). Install water pump assembly (37) and gaskets (38). Install the water pump bolts/screws (127 and 129) and stud (128). Tighten all to 30 lb.ft. (41 N.m).
2. Install the secondary air injection pump assembly: Install the AIR pump to bracket. (Scheme 23) Connect the mounting bolts (3), tightening them to 50 lb.in. (5.6 N.m). Connect outlet and inlet hoses to pump. Connect electrical connector to AIR pump.
3. Install the electrical connector to coolant sensor.
4. If equipped with a mechanical fan: Install the coolant fan pulley bracket (130). Install the coolant fan pulley bracket nuts (132), tightening them to 22 lb.ft. (30 N.m). Install the fan pulley. Install the fan blade assembly (249) with clutch assembly attached and nuts (247). Tighten the nuts to 19 lb.ft. (26 N.m).
5. On all, install the engine coolant and heater hose assemblies to water pump assembly (37).
6. If equipped with a mechanical fan: Install the fan belt to tensioner assembly. (Scheme 22) Install the radiator fan upper shroud: Install upper shroud assembly (27) to lower shroud assembly (28) and radiator support assembly. see scheme 12 Install the bolts/screws (25 and 26), tightening them to 53 lb.ft. (6 N.m).
7. If equipped with a mechanical fan: Install the air intake duct. Install air cleaner resonator assembly; slide resonator assembly over studs and tighten clamp until snug. Install the air cleaner resonator bracket nuts, tightening them to 89 lb.in. (10 N.m).
8. For all, refill and bleed the cooling system. See the «DRAINING & REFILLING COOLING SYSTEM»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p__draining-refilling-cooling-system) section in this article

Scheme 22

Scheme 23

Note. For component identification in removal and installation procedures. Refer to illustrations. (Scheme 24)- (Scheme 26).

1. Remove negative battery terminal. Disconnect harness connector from air pump.
2. Remove outlet and inlet hoses from air pump. Remove air pump mounting bolts, remove air pump.
3. Remove air pump bracket to block mounting bolt(s). Remove bracket. To install, reverse removal procedure. Tighten bolts and nuts to specification. See «TORQUE SPECIFICATIONS»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p__torque-specifications) .

Scheme 24

Scheme 25

Scheme 26

1. Disconnect negative battery cable. Remove air cleaner resonator and air intake duct. Remove radiator fan upper shroud (vehicles with mechanically driven fan). Disconnect windshield wiper motor electrical connector. Raise and support vehicle. Drain crankcase. Remove oil level sensor.
2. Disconnect exhaust pipes from manifolds. Disconnect catalytic converter support from transmission. Remove oil filter and adapter. Disengage transmission fluid cooler lines from clips at oil pan (A/T). Remove starter. Remove flywheel cover.
3. Rotate crankshaft until arrow on crankshaft balancer is pointing straight down (6 o'clock position). Remove engine mount through-bolts. Lift engine from above. Remove oil pan.

Installation (All Models)

To install, reverse removal procedure. Apply Sealant (1052914) to front cover, cylinder block, rear seal retainer and cylinder block junction. Install NEW oil pan gasket. Tighten bolts and nuts to specification. See TORQUE SPECIFICATIONS .

Valve Guides

Check and service guides before servicing valve and seat. Guide replacement information is not available from manufacturer. Valve guides may be reamed for installation of .003" (.08 mm), .015" (.38 mm) or .030" (.76 mm) oversize valves.

Valve Seat

Valve seat replacement information is not available from manufacturer. Follow instructions of tool manufacturer for servicing valve seats. If seats are serviced, service or replace valves.

Valves

Check valves before servicing. Replace valves as necessary. See VALVES & VALVE SPRINGS table under ENGINE SPECIFICATIONS. Valve face may be machined.

Valve Seat Correction Angles

If seat is too wide after grinding, use a 20-degree stone to lower or a 70-degree stone to raise seat.

Piston & Rod Assembly

1. Mark rod and rod cap with matching cylinder number. Before disassembling, mark piston-to-rod position for reassembly reference. Notch or dot on piston top should face front of engine. Piston pin is a press fit.
2. When measuring, ensure pin bore and piston pin are free of varnish and scuffing. If clearance between the piston and pin exceeds specification, replace the piston and pin as an assembly. See «PISTONS, PINS & RINGS»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p) table under ENGINE SPECIFICATIONS.

Fitting Pistons

Ensure notch or dot on piston top faces front of engine. Check pistons for wear and damage. Replace pistons as necessary. Check piston-to-cylinder bore clearance. If one cylinder needs to be bored, bore all cylinders to same oversize.

Piston Rings

Install marked side of ring toward top of piston. Top compression ring is chrome or molybdenum face. Second compression ring has a tapered face. Oil ring is a 3-piece type. Ensure end gaps are evenly spaced on piston. (Scheme 27)

Note. Rod and main bearings are available in .001" (.03 mm) and .002" (.05) undersize for oil clearance adjustment.

Rod Bearings

Ensure bearing cap bolt holes and mating surfaces are clean and dry. Use connecting rod stud protectors on rod cap bolts. Install inserts in connecting rod and cap. Lubricate bearings and crank pin. Install bearing cap. Tighten rod bearing cap bolts to specification. See TORQUE SPECIFICATIONS .

Crankshaft & Main Bearings

1. If bearing clearance is greater than specification, replace with undersized bearings and recheck bearing clearance using Plastigage. See «CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p) table under ENGINE SPECIFICATIONS.
2. Tighten the main bearing caps finger tight. Pry the crankshaft rearward and then forward to align the rear main bearing thrust surfaces. Retighten the main bearing caps to specification. See «TORQUE SPECIFICATIONS»(/chevrolet/caprice-impala-ss/1995-1996/remont/mechanical/#engine-mechanical-57l-v8-vin-p__torque-specifications) .

Thrust Bearing

Check crankshaft end play by forcing the crankshaft to the extreme forward position. Measure end play at the front of the rear main bearing using a feeler gauge. If end play is not within specification, replace thrust bearing and/or crankshaft. See CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS table under ENGINE SPECIFICATIONS.

Cylinder Block

Check cylinder bore for wear, taper, out-of-round and piston fit. See CYLINDER BLOCK table under ENGINE SPECIFICATIONS. Cylinders with less than .005" (.13 mm) wear or taper can be honed. Cylinders with more than .005" (.13 mm) wear or taper should be bored to smallest oversize piston which will permit complete resurfacing of all cylinders.

Scheme 27

ENGINE OILING SYSTEM

A gear-type oil pump provides pressurized lubrication through the full-flow oil filter. Oil pump is bolted to bottom of cylinder block, inside oil pan. Oil pump is driven (through intermediate shaft) by a gear on rear end of camshaft.

Crankcase Capacity

Crankcase capacity is 4 qts. (3.8L) without oil filter change or 5 qts. (4.7L) with oil filter change.

Oil Pressure

With engine at normal operating temperature, oil pressure should be at least 6 psi (0.4 kg/cm 2 ) at 1000 RPM, 18 psi (1.3 kg/cm 2 ) at 2000 RPM and 24 psi (1.7 kg/cm 2 ) at 4000 RPM.

Removal & Disassembly

Remove oil pan. See OIL PAN under REMOVAL & INSTALLATION. Remove oil pan baffle (if equipped). Remove oil pump assembly and intermediate shaft. Remove oil pump cover screws, and remove cover. Mark gear teeth for reassembly reference. Remove gears. Remove pressure regulator pin, spring and valve from cover. Remove pick-up screen and pipe from cover only if replacing.

Check oil pump body and gears for cracks, wear and damage. Check oil pump shaft for looseness in housing. Check inside of cover for wear or oil leakage. If excess wear or damage is found, replace oil pump as an assembly. Oil pump specifications are not available from manufacturer.

Reassembly & Installation

Clean parts in solvent. Dry parts using compressed air. To assemble, reverse disassembly procedure. To install, reverse removal procedure.

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

GENERAL SPECIFICATIONS

GENERAL SPECIFICATIONS

CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS

CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS

CONNECTING RODS

CONNECTING RODS

PISTONS, PINS & RINGS

PISTONS, PINS & RINGS

CYLINDER BLOCK

VALVES & VALVE SPRINGS

VALVES & VALVE SPRINGS

CYLINDER HEAD

CAMSHAFT

See also:
• ENGINE OVERHAUL PROCEDURES - GENERAL INFORMATION
• COMPUTER RELEARN PROCEDURES
• ENGINE IDENTIFICATION CODES
• FUEL PRESSURE RELEASE
• DRAINING & REFILLING COOLING SYSTEM
• TORQUE SPECIFICATIONS
• WATER PUMP