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 TM 55-1905-219-14-4
3-33.1.
VALVE AND INJECTOR OPERATING MECHANISM - MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
CLEANING AND INSPECTION
Use eye protection when using compressed air.
4. Rocker
Wash the rocker arms, shaft, brackets and bolts with
shaft
clean fuel oil. Use a small wire to clean out the
assembly
drilled oil passages in the rocker arms and rocker
shaft bolts. Dry the parts with compressed air.
Inspect the rocker arm shaft and rocker arm bushings
for wear. A maximum shaft to bushing clearance of
.004 inch (0.010 cm) is allowable with used parts.
Service replacement bushings must be reamed to size
after installation.
Inspect the rocker arms for galling or wear on the
pallets (valve or injector contact surfaces). If
worn, the surface may be refaced up to a maximum of
.010 inch (0.025 cm). However, proceed with caution
when surface grinding to avoid overheating the rocker
arm. Maintain the radius and finish as close to the
original surface as possible. Also inspect the valve
bridges for wear.
5.
Cam
Proper inspection and service of the cam follower is
follower
very necessary to obtain continued efficient engine
performance. When any appreciable change in injector
timing or exhaust valve clearance occurs during en-
gine operation, remove the cam followers and their
related parts and inspect them for excessive wear.
This change in injector timing or valve clearance can
usually be detected by excessive noise at idle speed.
Wash the cam followers with lubricating oil or Cindol
1705 and wipe dry. Do not use fuel oil. Fuel oil
working its way in between the cam roller bushing and
pin may cause scoring on initial start-up of the en-
gine since fuel oil does not provide adequate lubrica-
tion. The push rods, springs and spring seats may be
washed with clean fuel oil and dried with compressed
air.
3-706
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