Removal

Fig. 1 Cylinder Head-Camshaft-Valves:

Fig. 2 Rocker Cover:

REMOVE VALVE COVERS
1. Remove air cleaner assembly.
2. Disconnect battery and relocate spark plug wires.
3. Remove vacuum connections.
4. Remove rocker cover screws and remove cover Fig. 2.

REMOVE CAMSHAFT SPROCKETS
Refer to Engine/Timing Components/Timing Belt/Service and Repair, for disassembly and remove camshaft sprockets.
Service and Repair

Fig. 3 Auto Lash Adjuster Check:

CHECK AUTO LASH ADJUSTER FUNCTION
Check auto adjusters for free play by inserting a small wire through the air bleed hole in the rocker arm and VERY LIGHTLY push the auto adjuster ball check down Fig. 3. While lightly holding the check ball down move the rocker up and down to check for free play. If there is no play replace the adjuster.

NOTE: Do not disassemble the auto lash adjuster.

Fig. 4 Auto Lash Adjuster Retainers:

REMOVE CAMSHAFTS
1. Install auto lash adjuster retainers. Fig. 4.

Fig. 11 Distributor Drive:

2. Remove distributor extension Fig. 11.
3. When removing camshaft bearing caps do not remove the bolts from the bearing caps. Remove the rocker arm, rocker shafts and bearing cap as an assembly.

Fig. 5 Check Camshafts:

INSPECT CAMSHAFTS
1. Inspect camshaft bearing journals for damage and binding Fig. 5. If journals are binding, also check the cylinder head for damage Fig. 1. Also check cylinder head oil holes for clogging.
2. Front cylinder head camshaft check the tooth surface of the distributor drive gear teeth of the camshaft and replace if abnormal wear is evident Fig. 5.
3. Check the cam surface for abnormal wear and damage and replace if defective. Also measure the cam height Fig. 5.and replace if out of limit, standard value is 41.25 mm 1.624 inch, wear limit is 40.75 mm 1.604 inch.

Fig. 6 Inspect Rocker Arms:

INSPECT ROCKER ARMS
Check rocker arms for wear or damage Fig. 6. Replace as necessary.

INSPECT ROCKER ARM SHAFTS

Fig. 7 Rocker Arm Shaft Identification:

NOTE: The rocker arm shaft is hollow and is used as a lubrication oil duct. The rocker arm shaft on the inlet side has a 3mm diameter oil passage hole from the cylinder head. The exhaust side does not have this oil passage Fig. 7.

1. Check the rocker arm mounting portion of the shafts for wear or damage. Replace if heavily damaged or worn.
2. Check oil holes for clogging with small wire, clean as required Fig. 7.

REMOVE INTAKE MANIFOLD ASSEMBLY
Refer to Engine/Intake Manifold/Service and Repair.
Service and Repair

REMOVE EXHAUST MANIFOLDS
Remove exhaust manifolds and cross over, Refer to Exhaust System/Exhaust Manifold/Service and Repair.
Service and Repair

REMOVE CYLINDER HEADS

Fig. 14 Cylinder Head Bolt Removal Sequence:

Remove cylinder head bolts in sequence shown in Fig. 14 and remove cylinder head.

INSPECTION
1. Before cleaning, check for leaks, damage and cracks.
2. Clean cylinder head and oil passages.

Fig. 15 Check Cylinder Head:

3. Check cylinder head for flatness Fig. 15.
4. Cylinder head must be flat within:
^ Standard dimension = less than 0.05mm .002 inch
^ Service Limit = 0.2mm .008 inch
^ Grinding Limit = Maximum of 0.2 mm .008 inch is permitted.

CAUTION: This is a combined total dimension of stock removal from cylinder head if any and block top surface.