TM 5-3810-306-34
b. Remove capscrews (4) securing thrust plate (3).
c.
Repeat steps a and b for remaining tappets.
Remove thrust plate (3).
INSPECTION:
c.
Carefully remove camshaft (2) from engine.
1. INSPECT THE FUEL PUMP LOBE, VALVE LOBES
d. Remove gear (1) and pin (5) from camshaft
AND
BEARING
JOURNALS
FOR
WEAR,
using suitable puller.
CRACKING, PITTING AND OTHER DAMAGE.
3. REMOVE TAPPETS (6).
2. INSPECT GEAR (1) TEETH FOR WEAR AND
DAMAGE. LOOK FOR CRACKS AT ROOT OF
a. Rotate crankshaft to allow access to tappets (6).
TEETH.
NOTE
3. MEASURE BEARING JOURNALS AND VALVE
LOBES.
Only four tappets will be accessible
a. Bearing journal
at one time. Crankshaft must be
rotated three times to access all
Min. dia. = 2.3607 in.
tappets.
(59.962 mm)
b. Remove rubber bands from dowels securing
b. Valve lobes
only accessible tappets. Remove tappets (6)
from block and dowel from tappet.
(Min. dia. at peak of lobe)
Intake min. height = 2.0383 in.
CAUTION
(51.774 mm)
Exhaust min. height = 2.0313 in.
When reusing camshaft (2) and
(51.596 mm)
tappets (6), tappets must be matched
to their companion lobe on camshaft
c.
Fuel pump lobe
to prevent accelerated camshaft
wear.
Min. dia. = 1.626 in. (41.31 mm)
4. INSPECT CAMSHAFT BORES FOR DAMAGE OR
EXCESSIVE WEAR.
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