TM 5-3895-346-14
GEAR TRAIN AND TIMING
ENGINE OVERHAUL
the rod reaches the end of its upward travel. Remove the rod and turn the crankshaft, opposite the
direction of rotation, between 1/16 and 1/8 of a turn.
5.
Select a dial indicator with 0.001 inch graduations and a spindle movement of at least one inch.
Provide an extension for the indicator spindle. The extension must be long enough to contact the
piston just before it reaches the end of its upward stroke. Also, select suitable mounting
attachments for the indicator so it can be mounted over the injector tube in the cylinder head.
6.
Mount the indicator over the injector tube. Check to be sure the indicator spindle extension is free
in the injector tube and is free to travel at least one inch.
7.
Attach a suitable pointer to the engine lower front cover. The outer end of the pointer should
extend out over the top of the crankshaft pulley.
8.
Turn the crankshaft slowly, in the direction of engine rotation, until the indicator hand just stops
moving.
9.
Continue to turn the crankshaft, in the direction of rotation, until the indicator starts to move again.
Now set the indicator on zero and continue to turn the crankshaft until the indicator reading is 0.010
inch.
10.
Scribe a line on the crankshaft pulley in line with the end of the pointer.
11.
Slowly turn the crankshaft, opposite the direction of rotation, until the indicator hand stops moving.
12.
Continue to turn the crankshaft, opposite the direction of rotation, until the indicator starts to move
again. Now set the indicator on zero and continue to turn the crankshaft until the indicator reading
is 0.010 inch.
13.
Scribe the second line on the crankshaft pulley in line with the end of the pointer.
14.
Scribe a third line on the pulley halfway between the first two lines. This is top dead center.
CAUTION
If the crankshaft pulley retaining bolt loosened up, tighten it to the torque specified
in Specifications.
15.
Remove the dial indicator and rod from the engine.
16.
Install the injector as outlined in Fuel Injector. Then refer to Engine Tune-up and adjust the
exhaust valve clearance and time the fuel injector.
17.
Turn the crankshaft, in the direction of rotation, until the exhaust valves in the cylinder selected are
completely open. Reinstall the dial indicator so the indicator spindle rests on the top of the injector
follower. Then set the indicator on zero. Next, turn the crankshaft slowly, in the direction of
rotation, until the center mark on the pulley is in line with the pointer.
18.
Check the front end of the cam- shaft for an identification mark. For identification purposes, a
letter V is stamped on each end of a low velocity camshaft, but a letter V is not stamped on a high
velocity camshaft. Note the indicator reading and compare it with the dimensions listed in Table 1
for the particular camshaft in the engine.
19.
Remove the dial indicator. Also remove the pointer attached to the front of the engine.
20.
Install the valve rocker cover.
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