INSPECTION (Cont) - TM-55-1905-219-14-50686

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INSPECTION (Cont)

TM-55-1905-219-14-5 Landing Craft Utility (LCU) 1667 Class Boston Hull Numbers 1667-1670 NSN 1905-00-168-5764 Manual

INSTALLATION

TM 55-1905-219-14-5

3-97.1. CRANKSHAFT BEARINGS (Cont).

LOCATION

ITEM

ACTION

REMARK

INSPECTION (Cont)

localized high unit pressures in the center area of the bearing shell will cause pitting of the bearing surface.

Also, damaged bearings may cause bending fatigue and resultant cracks in the crankshaft. Refer to paragraph

3-97.2 under Crankshaft Inspection for removal of ridges and inspection of the crankshaft.

Do not replace one main bearing shell alone. If one bearing shell requires replacement, install both new upper

and lower bearing shells. Also, if a new or reground crankshaft is to be used, install all new bearing shells.

5. Upper

Thrust

Inspect.

If the washers

and

washers

are scored or

lower

(11 and

worn excessive-

thrust

13)

ly or the

washers

crankshaft end

play is exces-

sive, they must

be replaced.

Improper clutch

adjustment can

contribute to

excessive wear

on the thrust

washers. In-

spect the

crankshaft

thrust surfaces.

If, after dres-

sing or re-

grinding the

thrust surfaces,

new standard

size thrust

washers do not

hold the crank-

shaft end play

within the

specified

limits, it may

be necessary to

install over-

size thrust

washer on one

or both sides

of the rear

main bearing.

3-1721