TM5-6115-585-34NAVFAC P-8-623-34TO-35C2-3-455-2TM-05684C/05685B-34Top Dead Center. This can be measured on top ofexhaust valve stem with a dial indicator (see figure 7-5).NOTEAs the piston comes up to Top Dead Centerthere is very little change in the dial indicatorreading and extreme care should be used toestablish the exact Top Dead Center.Zero the dial indicator. Rotate flywheel in oppositedirection (clockwise) to a point where the dial indica-tor will indicate approximately 0.200 inch. Rotate fly-wheel counterclockwise slowly until dial indicatorshows 0.128 inch before Top Dead Center. Care mustbe taken to insure that the valve is following the piston,and that reading is accurate. This procedure must befollowed to insure that all slack is taken out of thepiston and connecting rod fits. At 0.128 inch beforeTop Dead Center position, check timing pointer intiming port on side of flywheel housing (5, figure 7-3).The timing pointer (10) should be in exact alignmentwith P.C. mark on flywheel. If pointer is net in align-ment, move pointer, and remark generator adapteras shown in figure 7-4. Destroy old alignment mark.Figure 7-4. Timing Port and Port Closing Mark7-5. FLYWHEEL HOUSING.a. Remove flywheel per paragraph 7-4. Removeflywheel housing (see figure 7-3). Remove screws (6),lockwashers (7) and washers (8) while supportinghousing (5). Remove flywheel housing.b. Clean and Inspect. Inspect flywheel housing forcracks or dents. Wipe interior of housing with cleancloth. Check to see that pointer is not bent and se-curely mounted.c. Install. Mount flywheel housing (5) to the engineusing screws (6), lockwashers (7) and washers (8).Figure 7-5. Measuring Top Dead Center7-6. OIL COOLER.a. Remove. Refer to Operator and OrganizationalMaintenance Manual and remove oil cooler.b. Clean and Inspect. In a suitable area clean oilcooler using a brush and fuel oil. Inspect for leaks,bent fins and/or bad inlet and outlet threads.c. Test (see figure 7-6).Figure 7-6. Testing Oil Cooler7-6Change 2
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