ARMY TM 9-2815-252-24
AIR FORCE TO 38G1-92-2
TABLE 3-5. Camshaft Component Wear Limits
Component
Initial
Maximum
Dimension
Clearance
inches
(mm)
inches
(mm)
Gear end camshaft
1.378
(34.990)
bushing bore
1.381
(35.085)
0.007
(0.17)
Gear end camshaft
1.3765
(34.965)
journal diameter
1.3771
(34.980)
Center camshaft
1.379
(35.030)
bushing bore
1.381
(35.070)
0.007
(0.17)
Center camshaft
1.3765
(34.965)
journal diameter
1.3771
(34.980)
Flywheel end camshaft
1.379
(35.030)
bushing bore
1.381
(35.070)
0.007
(0.17)
Flywheel end camshaft
1.3765
(34.965)
journal diameter
1.3771
(34.980)
3-29.3. Installation.
a. Carefully install camshaft (3, FIGURE 3-34) into crankcase keeping it square at all times. Take care to line
up 'O' timing marks on crankshaft and camshaft gears exactly.
b. Rotate camshaft (3) until large holes in gear line up with bolt holes in thrust plate.
c. Turn thrust plate as necessary to install two capscrews (1) and new lockwashers (2). Tighten capscrews (1) to
75-80 in-lbs (8.4 to 9.0 Nm).
d. Check camshaft end play as follows:
(1) Push camshaft towards flywheel end.
(2) Install a dial indicator in position against gear wheel.
(3) Zero the dial indicator.
(4) Move camshaft as far as it will go towards gear end. Movement recorded on the dial indicator should be
0.004 to 0.011 in. (0.10 to 0.28 mm)
CAUTION
Excessive camshaft end play affects governing and can cause uneven firing.
e. Measure timing gear backlash (FIGURE 3-35) as follows:
(1) Set a dial indicator on timing gear to be measured.
(2) Hold gear to be checked and adjoining gear stationary.
(3) Move gear tooth side to side in backlash. Record indicated backlash Total Indicator Reading (TIR).
Standard TIR is 0.004 - 0.007 in. (0.10 to 0.17 mm) with a limit of 0.012 in. (0.30 mm)
(4) If TIR exceeds limit, replace gear.
3-65
|
|
