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 TM 55-1905-220-14-5
3-90.1. VALVE AND INJECTOR OPERATING MECHANISM - MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
CLEANING and INSPECTION (Cont)
5.
Cam
Proper inspection and service of the cam follower is very necessary to obtain continued
follower
efficient engine performance. When any appreciable change in injector timing or exhaust
valve clearance occurs during engine 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.
WARNING
Wear eye protection when using compressed air.
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 engine since fuel oil does not provide adequate lubrication. The push
rods, springs and spring seats may be washed with clean fuel oil and dried with compressed
air.
Examine the cam follower rollers for scoring, pitting or flat spots. The rollers must turn freely
on their pins. Measure the total diametric clearance and side clearance. Install a new roller
and pin if the clearances exceed those shown below. Cam followers stamped with the letter
"S" on the pin, roller and follower body are equipped with an oversize pin and roller. The
same clearances apply to either a standard or oversize cam follower assembly.
Examine the camshaft lobes for scoring, pitting or flat spots. Replace the camshaft if
necessary. (Refer to Direct Support Maintenance). Check the cam follower-to-cylinder head
clearance. The clearance must not exceed .006 inch (0.015 cm) with used parts.
Examine the cam follower bores in the cylinder head to make sure they are clean, smooth
and free of score marks. If necessary, clean-up the bores.
3-1502
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