| Tweet |
Custom Search
|
|
|
||
 TM 55-1905-219-14-5
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
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.
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 en-
gine since fuel oil does not provide adequate lubri-
cation. The push rods, springs and spring seats may
be washed with clean fuel oil and dried with compres-
sed 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 clear-
ances 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.
3-1520
|
||
|
||
