5.0l (305") v8 - Vins [h,s] Chevrolet Camaro II

ENGINE IDENTIFICATION

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

Engine may be identified from the Vehicle Identification Number (VIN) stamped on a metal tab located on top of instrument panel at lower left of windshield. The VIN number contains 17 digits. The 8th digit identifies the engine and the 10th digit establishes the model year.

ENGINE IDENTIFICATION CODES

ENGINE

See ENGINE REMOVAL article in this section.

Removal (Carbureted Models)

1. Disconnect negative battery cable. Drain cooling system. Remove air cleaner. Remove AIR crossover hoses. Remove heater and radiator hoses. Remove alternator upper bracket. Disconnect carburetor linkage, fuel line, vacuum lines and electrical wiring at manifold.
2. Disconnect right side spark plug wires at spark plugs. Remove distributor cap and position cap and wires aside. Mark position of rotor with chalk and remove distributor. If equipped, remove A/C and cruise control servo brackets.
3. Remove brake vacuum pipe. If equipped, remove EGR valve. Remove carburetor. Remove manifold bolts and remove intake manifold.

Removal (CFI Models)

1. Disconnect negative battery cable. Drain radiator, remove air cleaner, EGR solenoid, and fuel inlet line. Disconnect idle air motors, injectors and Throttle Position Sensor (TPS). Remove alternator adjustment bracket. Remove power brake booster line and fuel return line.
2. If equipped with A/C, remove A/C strut. Disconnect accelerator cable and cruise control, if equipped. Disconnect PCV hose, vacuum hoses, fuel balance tube, CFI-to-manifold bolts and CFI plate. Remove cap and distributor. Remove radiator hose at thermostat housing. Disconnect heater hose and remove manifold.

Scheme 24

1. Clean mating surfaces of head and manifold. Install manifold side gaskets on cylinder heads. Using RTV sealer, lay a bead along front and rear ridge of block, about 1/2" up each head to seal and retain manifold side gaskets. (Scheme 24): Intake Manifold Tightening Sequence
2. Use sealer at water passages and install manifold and bolts. Tighten bolts in sequence. (Scheme 24) Reverse removal procedure to complete installation.

Removal (Left Side)

Disconnect negative battery cable. Raise vehicle on hoist. Disconnect exhaust pipe at manifold and suspend with wire. Lower vehicle. If equipped, remove A/C compressor and bracket and position aside, leaving refrigerant lines attached. Remove power steering bracket. Remove end bolts, center bolts and remove exhaust manifold.

Removal (Right Side)

1. Disconnect negative battery cable. Remove air cleaner and heat stove pipe. Raise vehicle on hoist. Disconnect exhaust pipe at manifold and suspend exhaust pipe with wire.
2. Lower vehicle. Disconnect spark plug wires, EFE valve vacuum hose and any emission control devices that interfere with manifold removal. Remove end bolts, center bolts and remove exhaust manifold.

Installation

Clean exhaust manifold and cylinder head mating surfaces of any carbon and/or dirt. Position manifold to cylinder head and install bolts finger tight. With manifold correctly positioned on cylinder head, tighten bolts to specification. Reverse removal procedure to complete installation.

Removal

1. Remove intake manifold as previously described. Remove alternator lower mounting bolt and position alternator aside. Remove exhaust manifold as previously described.
2. Remove rocker arm cover and remove rocker arm assembly. Drain cylinder block of coolant. If necessary, remove diverter valve. Remove head bolts, cylinder heads and gaskets. Place each cylinder head on 2 wood blocks to prevent damage.

Cylinder Head Tightening Sequence Apply sealer to head bolt threads and tighten in sequence. Scheme 25

1. Clean cylinder block and cylinder head mating surfaces of any gasket material, carbon and/or dirt. Make sure mating surfaces are free of any nicks or heavy scratches. Clean bolt hole threads in cylinder block to ensure proper bolt torque.
2. Where steel gaskets are used, apply a thin, even coat of sealer to both sides of gasket. On composition steel asbestos gaskets, do not use sealer of any type. Install gaskets over dowel pins with "bead" side up.
3. Install cylinder heads, applying sealing compound to head bolt threads and tighten in sequence. (Scheme 25) Reverse removal procedure to complete installation.

VALVE ARRANGEMENT

E-I-I-E-E-I-I-E (Both banks, front to rear).

VALVE GUIDE SERVICING

Insert valve with valve head positioned 1/16" above valve seat. Attach dial indicator to cylinder head. Position dial indicator stem against valve stem just above valve guide. Rock valve in guide and measure guide wear as shown on indicator.

If valve guide wear is excessive, ream valve guide to next size oversize. Service valves are available in standard, .003", .015" and .030" (.076, .381 and .762 mm) oversize.

VALVE STEM OIL SEALS SERVICE

Oil seals are installed on all valve stems and must be replaced whenever valve service is performed. See Valve Spring Removal for disassembly. Lightly coat seals with engine oil to prevent twisting. Reverse the disassembly procedures to complete installation. Using valve oil seal leak detector (J-23994 or equivalent), apply vacuum to make sure no air leaks past seal.

Removal (Cylinder Head Installed)

1. Remove rocker arm cover, spark plug, rocker arm and push rods on cylinder(s) to be serviced. Install air line adapter (J-23590 ) to spark plug port and apply compressed air to hold valves in place.
2. Using valve spring compressor (J-5892 ), compress valve spring and remove valve locking keys, valve cap, valve spring and damper. Remove valve stem or head oil seal.

Inspection

Check valve spring tension using valve and clutch spring tension tester (J-8056 or equivalent). Springs must be within 10 lbs. of specified load at required height (without dampers).

Installation (Cylinder Head Installed)

1. Install valve stem oil seal over valve stem and seat against cylinder head. Set valve spring and damper, oil shedder and valve cap (or rotator) in place. Compress spring with compressor tool (J-5892 ) and install oil seal in the lower groove of the stem.
2. Ensure seal is flat and not twisted. A light coat of oil will help prevent twisting. Install locking keys and release compressor tool. Use grease to hold keys in place while releasing tool. Using vacuum tool (J-23994 ), apply vacuum to valve cap and be sure no air leaks past seal. To complete installation, reverse removal procedure.

Removal (Cylinder Head Removed)

1. With rocker arm removed, compress valve springs using compressor tool (J-8062 ). Remove locking keys and release compression tool.
2. Remove caps (or rotators), oil shedders, springs and spring dampers, oil seals and valve spring shims. Keep components in original order for reinstallation in proper location.

Check valve spring tension using valve and clutch spring tension tester (J-8056 or equivalent). Springs must be within 10 lbs. of specified load at required height (without dampers).

Installation (Cylinder Head Removed)

Install valve spring shims, if used. Install springs, dampers, oil shedder and valve cap (or rotator). Compress spring with compressor (J-8062 ) and install oil seal in lower groove of valve stem. Ensure that seal is flat and not twisted. Install valve locks and release spring compression tool.

VALVE SPRING INSTALLED HEIGHT

Installed height of valve spring should be 1.72" (43.7 mm). Measure from top of spring seat (in head) to top of oil shield. If measurement exceeds specifications, install a 1/16" shim at spring seat. Valve spring should never be shimmed to give an installed height of less than minimum specification.

VALVE ADJUSTMENT

1. To adjust valves, rotate crankshaft to No. 1 firing position and adjust following valves: Intake No. 1, 2, 5 and 7. Exhaust No. 1, 3, 4 and 8.
2. Adjust valves by backing off adjusting nut until lash is felt at push rod, then tighten until all lash is removed. Tighten adjusting nut an additional 1 full turn. Rotate crankshaft to No. 6 firing position. Adjust the following valves: Intake No. 3, 4, 6 and 8. Exhaust No. 2, 5, 6 and 7.
3. When adjustment is complete, install rocker arm covers. Start engine and check timing and idle speed.

ROCKER ARM STUDS

Cylinder heads use pressed in rocker arm studs. Rocker arm studs having damaged threads or loose fit in cylinder head should be replaced. Studs are available in standard, .003" (.076 mm) and .013" (.330 mm) oversize.

Remove stud using puller tool (J-5802-1 or equivalent). Install removal tool over stud, install flat washer and nut and tighten nut until stud is removed.

1. If necessary, ream stud hole for oversize stud using reamer tool (J-5715 for .003" (.076 mm) oversize, and J-6036 for .013" (.330 mm) oversize). Do not install an oversize stud without first reaming stud hole, as damage to head casting may occur.
2. Coat press fit area of stud with hypoid axle lubricant. Drive stud into place using guide tool (J-6880 or equivalent) and a hammer. When guide tool bottoms on head, stud is at correct height.

HYDRAULIC VALVE LIFTER ASSEMBLY

Lifters are serviced as a complete unit only. If lifter is damaged or worn, it must be replaced. Should lifter be disassembled for any reason, test lifter leakdown rate. When new lifters are installed, an additive containing EP lubricant should be added to crankcase oil during break-in period. (Scheme 26) Make sure lifter foot is convex for proper lifter rotation.

Exploded View of Hydraulic Lifter Assembly. Scheme 26

OIL PAN

See OIL PAN REMOVAL article in this section.

1. With oil pan, oil pump and cylinder heads removed, use a ridge reamer to remove any ridge or deposit from upper portion of cylinder bore. Be sure piston and rod assembly is marked for reinstallation in original location.
2. With piston at bottom of stroke, remove connecting rod cap and install rod bolt guides over rod bolts. Push piston and rod assembly out top of bore and reinstall rod cap to respective rod. Rotate crankshaft as required to remove remaining piston and rod assemblies.

1. Apply a light coating of oil to pistons, rings, cylinder bores and bearings. Install bearings on connecting rods. Use compression tool (J-8037 ) to compress rings. Ensure that ring gaps are staggered around piston and are not aligned.
2. Install piston and rod assembly with bearing tang slot on opposite side of camshaft. Remove rod bolt guides, install bearings and caps and tighten.

FITTING PISTONS

Note. New pistons must be installed into cylinders for which they were fitted. Old pistons should be returned to cylinders from which they were removed.

1. Measure cylinder bore diameter with an inside micrometer or dial bore gauge 2 1/2" (63.50 mm) from top of cylinder. Center dial bore gauge in cylinder and set indicator to zero. Move gauge carefully up and down cylinder and turn in different directions to determine cylinder out-of-round and taper.
2. Out of round must not exceed .002" (.051 mm) and taper .005" (.128 mm). Cylinder may be honed and .001" (.025 mm) oversize pistons installed if measurements do not exceed specifications. Measure piston on skirt at right angles to piston pin at centerline of pin. Oversize pistons are available if cylinders are bored.

FITTING RINGS

1. Position ring in cylinder bore. Push ring down into cylinder bore approximately 1/4" above ring travel, making sure ring is positioned squarely in cylinder bore.
2. Measure gap between ends of ring using feeler gauge. If gap is not within specification, substitute another ring set until fit is correct.

PISTON PINS

Using arbor press and piston pin remover (J-24086-8 ), remove pin. With piston and rod separated, inspect pin and pin bore for wear and measure clearance. If clearance exceeds .001" (.025 mm), replace piston and pin assembly.

Note. During production, .009" (.229 mm) undersize bearings may have been installed for close tolerances on some journals.

CONNECTING ROD BEARING SERVICE

1. Remove rod cap and use Plastigage method to check bearing clearance. Place Plastigage across full width of bearing journal, parallel to crankshaft. Install rod cap and tighten nuts.
2. Remove rod cap and determine amount of clearance by measuring width of compressed Plastigage at widest point. Bearings must be replaced if clearance is inaccurate. Precision bearings have been used and shimming is not necessary for adjustment. Never file or grind connecting rods or caps when fitting bearings.
3. New bearings are available in standard, .001" (.025 mm) and .002" (.051 mm) undersize for use with standard size crankshaft and in .009", .010" and .020" (.229, .254 and .508 mm) undersize for use with reconditioned crankshaft.
4. Use a micrometer to check for out-of-round condition on crankshaft journals. If journals are more than .001" (.025 mm) out-of-round or tapered, crankshaft must be replaced or reconditioned.
5. When all bearings are checked and/or replaced and checked once more, tap each rod lightly (parallel to crankpin). Be sure side play clearance is within specification. If clearance cannot be corrected with service bearings, grind crankpin to next undersize. If already ground to maximum undersize, replace crankshaft.

MAIN BEARING SERVICE

1. If bearings are being checked with engine in vehicle, crankshaft must be supported to take up clearance between upper bearing half and crankshaft. Support crankshaft at both damper and flywheel. Be sure all bearing caps, other than the one being checked, are tightened to specification.
2. Start with rear main bearing and work forward. Remove main cap and use Plastigage method to check bearing clearance. Place Plastigage across full width of bearing journal, parallel to crankshaft. Install main cap and tighten bolts to specification.
3. Remove main cap and determine amount of clearance by measuring width of compressed Plastigage at widest point. Bearings must be replaced if clearance is not within specifications. Always install bearings in pairs. Never combine old and new bearing halves.
4. New bearings are available in standard, .001" and .002" (.025 and .051 mm) undersize for use with standard size crankshaft and in .009", .010" and .020" (.229, .254 and .508 mm) undersize for use with reconditioned crankshaft.
5. If main bearing cap requires replacement, laminated shims are available. Shim requirement is determined by bearing clearance. Replace upper and lower inserts as a unit. Use a micrometer to check for out-of-round condition on crankshaft journals.
6. If journals are more than .001" (.025 mm) out-of-round or tapered, crankshaft must be replaced or reconditioned. If within specifications, coat bearings with oil and install main caps. When all bearings are checked and/or replaced and checked once more, check thrust bearing alignment.

THRUST BEARING ALIGNMENT

1. Make sure all main bearing caps are installed with arrows pointing toward front of engine. Tighten main bearing cap bolts (except rear main) to specification. Tighten rear main bolts to 11 ft. lbs. (15 N.m) and tap end of crankshaft rearward and then forward to line up main bearing thrust surfaces with crankshaft thrust face.
2. Tighten all main bearing cap bolts to specification. Rotate crankshaft to ensure there is no excessive drag. Measure end play at front end of rear main bearing using feeler gauge.

REAR MAIN BEARING OIL SEAL

Note. Always replace upper and lower seals as a unit. Lip of seals should face front of engine.

Scheme 27

1. Remove oil pan and oil pump. Remove rear main bearing cap and take out old seal with a small screwdriver. (Scheme 27): Rear Main Bearing Oil Seal Installation Tool Position installer between crankshaft and seal seat in cylinder block.
2. Remove upper seal with a brass pin punch. Tap punch until seal protrudes enough to grip with pliers. Clean foreign material from bearing cap and block.
3. Check components for scratches, nicks and defects. Before installation, make a seal installation tool using a piece of.004" (.102 mm) shim stock. (Scheme 27)

1. Coat seal lips and seal bead with light engine oil. Keep oil off seal mating ends. Position tip of tool between crankshaft and seal seat in cylinder block. Place seal between tip of tool and crankshaft, so that seal bead contacts tip of tool.
2. Roll seal around crankshaft using tool as a "shoe horn" to protect seal bead from sharp corner of cylinder block. Tool must be kept in position until ends of seal are seated flush with block. Carefully remove tool without pulling seal out with it.
3. Install lower half of oil seal in bearing cap and apply sealer on cap-to-case interface. Install bearing cap and tighten.
4. To line up main bearing thrust surfaces, tap end of crankshaft rearward and then forward. Tighten main bearing cap bolts to specification.

Drain cooling system, remove belts, fan and pulley. Use torsional damper puller tool (J-23523 or equivalent) to remove damper. Remove water pump. Remove front cover retaining bolts, cover and gasket.

1. Apply sealer to new gasket and a rubber sealer to joint formed where oil pan meets cylinder block. Place gasket on cover and install cover-to-oil pan seal. Place cover over end of crankshaft and loosely install cover-to-block screws.
2. Tighten screws alternately while pressing down on cover so that dowels are aligned with holes in cover. Do not force cover over dowels as distortion of holes will result.
3. Install remaining screws. Install torsional damper using installer (J-23523 or equivalent). Install pulley, fan, belts and water pump. Refill cooling system.

The oil seal may be replaced without removing cover. Pry old seal outward with large screwdriver.

Install new seal with open end toward inside of cover. Drive seal into position using installer (J-23042 or equivalent).

Remove front cover and use torsional damper retaining bolt to rotate crankshaft so timing marks are aligned. Remove camshaft sprocket bolts. Use 2 large screwdrivers to alternately pry camshaft sprocket forward until free.

Timing Chain Sprocket Alignment Align marks on camshaft and crankshaft sprockets. Scheme 28

1. With camshaft installed, place timing chain over camshaft sprocket so that it hangs below sprocket. Align marks on camshaft and crankshaft sprockets. (Scheme 28)
2. Align dowel in camshaft with dowel hole in camshaft sprocket. Install sprocket on camshaft. Use mounting bolts to draw sprocket onto camshaft and tighten bolts. Check sprocket alignment, lubricate chain with engine oil and reinstall other components.

Remove intake manifold as previously described. Remove rocker arm assembly, push rods and lifters. Remove radiator, grille, water pump and front engine cover. Remove fuel pump push rod. Install two 5/16 x 4" bolts in camshaft bolt holes and carefully remove camshaft.

Note. All camshaft journals are same diameter. Use care when removing camshaft to prevent damage to lobes or journals. If journals are more than .001" (.025 mm) out-of-round, replace camshaft. If replaced, install all new lifters.

Lubricate journals with engine oil and apply Molykote or equivalent to camshaft lobes. Carefully install camshaft. Complete installation by reversing removal procedure.

1. With crankshaft and camshaft removed, drive camshaft plug out rear of cylinder block. Using camshaft bearing remover tool (J-6098 or equivalent), remove center 2 bearings. Index pilot in front bearing and install puller screw through pilot.
2. Install bearing remover tool with shoulder toward bearing. Make sure enough threads are engaged. With 2 wrenches, use 1 to hold puller screw, the other to turn nut.
3. Index pilot in rear bearing to pull rear intermediate bearing. Assemble remover tool on driver handle and remove front and rear bearings by driving toward center of engine.

1. Install front and rear bearings first. These bearings act as guides for the pilot and center the remaining bearings being pulled into place. Assemble tool on driver handle and install camshaft front and rear bearings by driving toward center of block. NOTE: No. 1 bearing should be installed so oil holes are equidistant from 6 o'clock position; No. 2 through No. 4 bearings should be installed with oil holes at 5 o'clock position; No. 5 at 12 o'clock position.
2. Using camshaft bearing removal tool (J-6098 or equivalent), install 2 center bearings with oil holes aligned with holes in block. Camshaft plug should be installed flush to 1/32" deep and parallel with surface of block. Reverse removal procedure to complete installation.

CRANKCASE CAPACITY

Crankcase capacity including filter change is 5 quarts (4.7L).

NORMAL OIL PRESSURE

Oil pressure is 30-40 psi (2.1-2.8 kg/cm 2 ) @ 2000 RPM.

PRESSURE REGULATOR VALVE

Pressure regulator valve is located in oil pump body and is not adjustable.

ENGINE OILING SYSTEM

Oil is supplied under pressure by a gear-type pump, driven by the distributor, which in turn is driven by a helical gear on the camshaft. The main oil gallery (down center of block above camshaft on V8 engines, along left bank of V6 engines) feeds oil through drilled passages to the camshaft and crankshaft to lubricate bearings.

The valve lifter oil gallery feeds valve lifters, which through hollow push rods feed individually mounted rocker arms. All other components are lubricated by splash or nozzle.

Remove oil pan. Remove pump-to-rear main bearing cap bolt and remove pump and extension shaft.

Disassembly

1. Remove pump cover and mark gear teeth so they may be reassembled with same teeth indexing. Remove idler gear and the drive gear and shaft from pump body.
2. Remove pressure regulator valve retaining pin, valve and related parts. Pull pickup screen and pipe assembly from pump body, if replacement is necessary. Do not disturb pickup screen on pipe. This is serviced as an assembly.

Exploded View of Oil Pump Assembly. Scheme 29

Reassembly

1. If pump gears or body are damaged or worn, replacement of entire pump assembly is necessary. Apply sealer to end of replacement pickup tube and using installer (J-8369 ), tap tube in place with plastic hammer. Install pressure regulator valve and related parts.
2. Install drive gear and shaft in pump body. Install idler gear in pump body with smooth side of gear towards pump cover opening. Install pump cover and tighten screws. Turn drive shaft to ensure smooth operation.

Install pump and extension shaft to rear main bearing cap. Align slot on top end of extension shaft with drive tang on lower end of distributor drive shaft. Install pump to rear main bearing cap bolt and tighten.

1. Disconnect negative battery cable. Drain cooling system. Remove fan shroud or upper radiator support, if necessary. Remove drive belts. Remove fan and pulley from water pump hub. Remove upper and lower alternator brackets and power steering pump lower bracket from water pump (if equipped) and swing aside.
2. Remove lower radiator hose and heater hose from water pump. Remove water pump to block attaching bolts and remove water pump.

To install, reverse removal procedure, noting the following: If using a new pump, transfer pulley from old pump. Use a new gasket.

Note. For further information on cooling system capacities and other cooling system components, see ENGINE COOLING SYSTEMS article in this section.

TORQUE SPECIFICATIONS

TIGHTENING SPECIFICATIONS

GENERAL ENGINE SPECIFICATIONS

GENERAL SPECIFICATIONS

VALVE SPECIFICATIONS

VALVE SPECIFICATIONS

PISTON/PIN/RING SPECIFICATIONS

PISTONS, PINS, RINGS SPECIFICATIONS

BEARING SPECIFICATIONS

MAIN & ROD BEARINGS SPECIFICATIONS

VALVE SPRING SPECIFICATIONS

VALVE SPRINGS SPECIFICATIONS

CAMSHAFT SPECIFICATIONS

CAMSHAFT SPECIFICATIONS

See also:
• ENGINE OVERHAUL PROCEDURES - GENERAL INFORMATION