TM 5-3805-255-14
0090
CLEANING, INSPECTION, AND REPAIR CONTINUED
8. Inspect crankcase for sludge deposits, especially in corners. Crankcase must be thoroughly cleaned and
inspected. Remove oil gallery plugs and flush out passages in crankcase with fuel oil. Install plugs.
9. Replace front and rear main oil seals. Refer to Installation in this work package for rear main oil seal
replacement details. For front main oil seal replacement refer to WP 0088. Discard front and rear main oil seal.
10. Remove and clean crankcase breather element. Element is located in mounting flange of breather pipe which
is secured to right hand (rear) side of crankcase.
11. Inspect oil pan and clean thoroughly.
END OF TASK
CRANKSHAFT BEARING CAPS
00090
Crankshaft main bearing caps are rough machined and line reamed while fitted to crankcase. Each cap is fitted for
its respective position.
Dimensions of Main Bearing Bore in Crankcase
00090
Line-Ream Final To . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.844 to 4.845 in. (123.04 to 123.06 mm)
END OF TASK
INSTALLATION
00090
1. Wipe seven crankcase bearing supports (Figure 9, Item 1) free of oil with a lint-free clean cloth. Crankcase
(Figure 9, Item 4) must be bottom side up and supported level with blocks.
2. Install seven main bearing upper halves (Figure 9, Item 2) (bearings with oil hole in center) on crankcase
bearing supports (Figure 9, Item 1). If original bearings are being reinstalled, be sure that they go to positions
from which they came. Nibs of bearings must fit in notches (Figure 9, Item 3) on crankcase bearing supports.
Lubricate main bearing upper halves with clean engine oil (WP 0018).
Figure 9. Installing Upper Halves of Main Bearings.
0090
0090-11
