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TM 5-4210-220-12
4-15. AUXILIARY POWER UNIT - Continued
4-15.11 Engine Crankshaft and Camshaft - Continued
(9)
Install expansion plugs in crankshaft.
(10)
Inspect main crankshaft bearings. If crankshaft
has to be reground or replaced, replace
bearings using puller 7070.3595.46.
(11)
If original crankshaft is to be installed, measure
inner diameter of journal bearings and compare
with
crankshaft
journals
(See
table
for
specifications).
(12)
Inspect bearing end plate. Measure seal ring
housing diameter A, bearing housing diameter
B, and centering ring housing C. In each case
measure at least 3 different diameters.
A
Seal Housing
2.0472 - 2.0488 (51.96 - 52.00 mm)
B
Bearing Housing
1.7320 - 1.7336 (43.96 - 44.00 mm)
C
Centering Housing
4.8860 - 4.8872 (124.01 - 124.04 mm)
(13)
Replace bearing end plate if any housing is
worn beyond specification (see table) or any housing is
out of round by more than 0.004 in. (0.010 mm).
(14)
Remove oil plug from end of camshaft. Clean
oil way with wire. Replace oil plug.
(15)
Measure camshaft lobe diameters (Valve lobes
are furthest away from gear and are narrower than
injector pump lobe). Replace if below tolerance or lobes
are severely grooved.
Inlet & Exhaust Valve
Injector Pump
A
B
C
D
in.
1.095 - 1.103
1.3057 - 1.3061
1.095 - 1.103
1.375 - 1.379
mm
27.80 - 28.00
33.14 - 33.15
27.80 - 28.00
34.90 - 35.00
(16)
Measure camshaft journal diameters. They should be 0.7864 - 0.7868 in. (19.96 - 19.97 mm) and 1.0220 -
1.0224 in. (25.94 - 25.95 mm). Replace if below tolerance. They cannot be reground.
(17)
Measure camshaft bearing diameters in crankcase and crankcase cover.
4-178
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