Top Dead Center. This can be measured on top of
exhaust valve stem with a dial indicator (see figure 7-
As the piston comes up to Top Dead Center
there is very little change in the dial indicator
reading and extreme care should be used to
establish the exact Top Dead Center.
Zero the dial indicator. Rotate flywheel in opposite
direction (clockwise) to a point where the dial indica-
tor will indicate approximately 0.200 inch. Rotate fly-
wheel counterclockwise slowly until dial indicator
shows 0.128 inch before Top Dead Center. Care must
be taken to insure that the valve is following the piston,
and that reading is accurate. This procedure must be
followed to insure that all slack is taken out of the
piston and connecting rod fits. At 0.128 inch before
Top Dead Center position, check timing pointer in
timing port on side of flywheel housing (5, figure 7-3).
The timing pointer (10) should be in exact alignment
with P.C. mark on flywheel. If pointer is net in align-
ment, move pointer, and remark generator adapter
as shown in figure 7-4. Destroy old alignment mark.
Figure 7-4. Timing Port and Port Closing Mark
7-5. FLYWHEEL HOUSING.
a. Remove flywheel per paragraph 7-4. Remove
flywheel housing (see figure 7-3). Remove screws (6),
lockwashers (7) and washers (8) while supporting
housing (5). Remove flywheel housing.
b. Clean and Inspect. Inspect flywheel housing for
cracks or dents. Wipe interior of housing with clean
cloth. Check to see that pointer is not bent and se-
c. Install. Mount flywheel housing (5) to the engine
using screws (6), lockwashers (7) and washers (8).
Figure 7-5. Measuring Top Dead Center
7-6. OIL COOLER.
a. Remove. Refer to Operator and Organizational
Maintenance Manual and remove oil cooler.
b. Clean and Inspect. In a suitable area clean oil
cooler 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 Cooler