TM 9-2320-272-24-4
5-9. CAMSHAFT AND GEAR MAINTENANCE (Contd)
e. Assembly
Install thrust ring (3), woodruff key (4), camshaft gear (1), and pipe plug (5) in camshaft (2).
f. Installation
CAUTION
Positioning of new camshaft bushing in No. 7 bushing bore (rear of
cylinder block) is critical. The new bushing must be pressed in,
leaving clearance between bushing and rear face of cylinder block
to allow oil to drain from hole at rear of camshaft. Hydraulic lock
will occur if oil drain passage is blocked.
NOTE
No. 1 cam bushing (gear end) is wider; all others are the same.
1.
Position seven cam bushings (7) on cam bushing replacer (6), aligning oil hole (8) in cam bushing (7)
to oil hole in main bearing bore.
2.
Press seven cam bushings (7) into position in cam bore and check oil hole (8) alignment with a brass
rod through main bearing bore oil hole and cam bushing oil hole (8). If brass rod does not pass
through with ease, reposition cam bushings (7).
Use extreme care when installing camshaft to avoid damage to
bearings and camshaft lobes.
NOTE
Assistant will help with steps 3 through 5.
3.
Apply coat of lubricating oil to camshaft lobes (10) on camshaft (2) and camshaft gear (1).
4.
Position camshaft (2) and camshaft gear (1) in engine block (9) by grasping camshaft gear (1) with
both hands and gently sliding end into cam bore (11). With aid of assistant, carefully guide lobes (10)
through bore (11) as camshaft (2) is installed.
5.
Align index mark on camshaft gear (1) with index mark on crankshaft gear (12).
6.
Repeat task a. to check backlash.
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