Quantcast CLEANING AND INSPECTION - TM-55-1905-220-14-60769

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TM 55-1905-220-14-6
3-165.1. VALVE INJECTOR MECHANISM - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
CLEANING AND INSPECTION
Wear eye protection when using compressed air.
4.
Rocker
a.
Wash the rocker arms, shaft, brackets and bolts
shaft
with clean fuel oil. Use a small wire to clean
assembly
out the drilled oil passages in the rocker arms
and rocker shaft bolts. Dry the parts with
compressed air.
b.
Inspect the rocker arm shaft and rocker arm bush-
ings. A maximum shaft bushing clearance of .004
inch (0.010 cm) is allowable with used parts.
Service replacement bushings must be reamed to
size after installation.
c.
Inspect the rocker arms for galling or wear on
the pallets (valve of 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 overheat-
ing the rocker arm. Maintain the radius and finish
as close to the original surface as possible.
Inspect the valve bridges for wear.
5. Cam
a.
Proper inspection and service of the cam follower
follower
is very necessary to obtain continued 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.
b.
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 pushrods, springs and
spring seat may be washed with clean fuel oil and
3-2744


 


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