Chevy Caprice Repair Manual 1990-1993

VALVE LIFTERS | REMOVAL AND INSTALLATION
EXCEPT ON 5.0L (VIN Y) ENGINE
(See Figure 52)

1. Remove the intake manifold, valve cover and push rod cover (4-cylinder). Disassemble the rocker arms and remove the push rods.



2. Remove the lifters. If they are coated with varnish, clean with carburetor cleaning solvent.



3. If installing new lifters or you have disassembled the lifters, they must be primed before installation. Submerge the lifters in SAE 10 oil and carefully push down on the plunger with a 1/8 inch drift. Hold the plunger down (DO NOT pump), then release the plunger slowly. The lifter is now primed.



4. Coat the bottoms of the lifters with Molykote before installation. Install the lifters and push rods into the engine in their original position.



5. Install the rocker arms and adjust the valves. Complete the installation by reversing the removal procedure.

5.0L (VIN Y) ENGINE
(See Figures 53, 54 and 55)

Valve lifters and push rods should be kept in order so they can be reinstalled in their original position. Some engines will have both standard and 0.010 in. oversize valve lifters as original equipment. The oversize lifters are etched with an O on their sides; the cylinder block will also be marked with an O if the oversize lifter is used.

1. Remove the intake manifold and gasket.
   
   
2. Remove the valve covers.
   
   
3. Remove the valve lifter retainer and guide.
   
   
4. Remove the rocker arm assemblies and push rods.
   
   
5. If the lifters are coated with varnish, apply carburetor cleaning solvent to the lifter body. The solvent should dissolve the varnish.
   
   
6. Remove the lifters. Remove the lifter retainer guide bolts, and remove the guides. A Special tool for removing lifters is available from local parts suppliers, and is helpful for this procedure.
   
   TO INSTALL
   
   
7. New lifters must be primed before installation. Submerge the lifters in SAE 10 oil, which is very thin. Carefully insert the end of a 1/8 inch (3mm) drift into the lifter and pump up and down on the plunger. The lifter is now primed.



8. Coat the bottoms of the lifters and rollers with Molykote or an equivalent molybdenum-disulfide lubricant before installation. Install the lifters and push rods into the engine in their original order. Install the lifter retainer guide.



9. Install the rocker arm assemblies and pushrods. Torque the rocker arm to 22 ft. lbs. (28Nm).



10. Install the valve lifter retainer guide.



11. Install the intake manifold gaskets and manifold.



12. Install the valve covers.



13. Change the engine oil and filter, connect the negative battery cable, check and fill the coolant to the proper level.



14. Start the engine and check for leaks.

CHOKE ROD FAST IDLE CAM ADJUSTMENT
(See figure 12)

1. Connect a rubber band to the green tang of the intermediate choke shaft.



2. Open the throttle to allow the choke valve to close.



3. Set up the angle gauge and set the angle to specifications.



4. Place the cam follower on the second step of the fast idle cam, against the rise of the first step. If the cam follower does not contact the cam, turn the idle screw additional turns.



5. To adjust, bend the tang of the fast idle cam until the gauge bubble is centered.


NOTE: The final fast idle speed adjustment mast be performed according to the emission control label.

UNLOADER ADJUSTMENT
(See Figure 13)

1. Connect a rubber band to the green tang of the intermediate shaft.



2. Open the throttle to allow the choke valve to close.



3. Set up the angle gauge and set angle to specifications.



4. Hold the secondary lockout lever away from the pin.



5. Hold the throttle lever in the wide-open position.



6. To adjust, bend the tang of the fast idle lever until the bubble of the angle gauge is centered.

ROUTINE MAINTENANCE
Model identification | Routine maintenance | Fluids and lubricants | Pushing and towing | Jacking

ENGINE PERFORMANCE & TUNE-UP
Tune-up procedures | Firing order | Electronic ignition | Idle speed and mixture adjustments

ENGINE AND ENGINE REBUILDING
Engine electrical | Engine mechanical | Exhaust system

ENGINE CONTROLS
Emission controls | Electronic engine controls

FUEL SYSTEM
Carbureted fuel system | Gasoline fuel injection system | Fuel tank

CHASSIS ELECTRICAL
Air bag | Air conditioner | Entertainment systems | Windshield wipers and washers | Intstrument and switches | Lighting

DRIVE TRAIN
Automatic transmission | Driveline | Rear axle

SUSPENSION AND STEERING
Wheels | Front suspension | Rear suspension | Steering

BRAKES
Basic operating principles | Brake system | Front disc brakes | Rear drum brakes | Parking brake | Anti-lock brake system

BODY
Exterior | Interior