1. With engine and oil at normal operating temperature, check oil pressure at 2000 rpm. If oil pressure is above 50 psi (345 kPa) or below 5 psi (34 kPa), inspect the following for restrictions or blockage:
a. Oil pump
b. Crankcase passages
c. Oil hoses
2. Repair or replace parts as necessary.
3. If oil is not reaching the hydraulic lifters, remove and inspect. See 3.21 PUSHRODS, LIFTERS AND COVERS,
Lifter Inspection. Clean lifter bore of all foreign material. Replace hydraulic lifter if required.
4. Inspect pushrod, lifter and lifter block for proper fit and unusual wear. Replace parts as necessary.
5. Visually inspect camshaft lobes for abnormal wear.
6. Check cam chain tensioning shoe for wear.
7. Remove cylinder head and rocker box assemblies. Check rocker arm end play and check for binding. Inspect valve
stems for scuffing and check stem to guide clearance. Check valve seats for signs of looseness or shifting.
8. Grind valves and valve seats. See 3.22 CYLINDER HEAD, Valve and Seat Refacing.
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