TM 5-4320-300-14Table 6-1. General Support Maintenance Troubleshooting - ContinuedMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONb.Put throttle control in idler position. Pull out PULL TO STOP handle. Rotate crankshaft with startingmotor until injector follower is fully depressed. Loosen jam nut between exhaust valve rocker arm andpush rod.c.Slide a 0.027 inch feeler gage between end of exhaust valve stem and rocker arm bridge. Ifgage moves freely between valve stem and bridge, the exhaust valve adjustment is incorrect.Adjust push rod to obtain a smooth pull on feeler gage. Remove feeler gage,hold push rod, and tighten jam nut. Recheck clearance; if adjustment is correct,gage will not pass through. Readjust push rod if necessary. Adjust remainingexhaust valves as necessary. Install valve cover, new gasket, and mountingbolts.2.ENGINE CONSUMES EXCESSIVE LUBE OIL (MAY PRODUCE BLUE SMOKE)Step 1.Check for worn or broken oil control rings. Inspect pistons and rings (para 6-10). Inspect cylinderliners (para 6-8).Repair or replace faulty pistons (para 6-10) and cylinder liners (para 6-8). Replace oil control rings(para 6-10).Step 2.Check for scored cylinder liners or pistons. Inspect cylinder liners (para 6-8). Inspect pistons (6-10).Repair or replace faulty cylinder liners (para 6-8) and pistons (para 6-10).Step 3.Check for loose piston pin retainers. Inspect piston pin retainers (para 6-10). Replace a loose pistonpin retainer (para 6-10).6-3
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