C 3500 Truck 2WD V8-379 6.2L DSL (1986)
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Scoring
4.
Inspect springs for:
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Damaged or distorted coils
Stuck Valve Servicing
If during disassembly of the control valve assembly a valve is found to be sticking in a bushing or bore, use the following procedure to service the valve
and bushing or bore:
-VALVE LANDS
1.
Apply a small amount of "micro fine" lapping compound to the valve lands. (The lapping compound should be 900 grit or finer.) Reinsert the
valve into the bushing (or bore in the valve body). (Refer to Figure 4)
-STEEL VALVES
2.
A. Steel Valves
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Using a pencil type magnet, rotate the valve while moving it back and forth in the bore. (Refer to Figure 5)
B.
Aluminum Valves
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Using a small flat blade screwdriver, move the valve back and forth in the bore.
IMPORTANT:
Too much "lapping" of a valve will cause excessive clearances and increase the chance of a valve not operating. Clearances between a
valve and its sleeve or bore are normally .028 - .04 mm (.001 - .0015").