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TM 5-4210-220-12
4-15. AUXILIARY POWER UNIT - Continued
NOTE
Difference between these measurements and
those in step 16 must be less than 0.004 in.
(0.10 mm). Replace camshaft or crankcase,
or crankcase cover as required.
(18)
Insert crank into crankcase cover. Check for radial
movement between needle bearing and journal.
Replace bearing if movement is excessive using
puller 7070.3595.46. Replace bearing from crank
side of cover. Engraved side of bearing must be on
crank side of cover.
(19)
Check flange area of cover. Clean away all gasket
material. Remove any burrs or sharp edges with
emery cloth (item 13, Appendix E).
(20)
Remove valve tappet circlip and lift out both
tappets.
(21)
Inspect valve tappets. Diameter of pivot must be
between 0.370 - 0.378 in. (9.4 - 9.6 mm). Replace
as required.
(22)
Measure diameter of pivot hole in both tappets.
Hole must not be greater than (pivot diameter +
0.004 in. (0.1 mm)). Replace pivot or tappets as
required.
(23)
Check gap between tappet rollers and shaft. Gap
must be greater than 0.008 in. (0 2 mm). Replace
hinged tappet if necessary. Roller must roll freely
and not bind.
(24)
Install both tappets on pivot and replace circlip.
(25)
Inspect both crankshaft thrust washers for wear.
Replace if badly scored or if any measurement
indicates a thickness of less than 0.090 in. (2.31
mm)
4-179
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