Installation - continued - TM-10-3930-673-340185

TM 10-3930-673-34

(d)

Press finger against bearing half (5) and turn crankshaft (1) to roll the bearing half from the

cylinder block.

CAUTION

If crankshaft is turned in the wrong direction, the tab on the upper bearing half will be

pushed between the crankshaft and main bearing bore in the block. This could cause

damage to the block and the crankshaft.

(e)

Remove main bearing halves (5 and 6) from main bearing position no. 7, Removal Steps (2)(b)

through (f).

NOTE

When bearings are reused, each bearing must be installed in its original location

because the bearing surfaces have worn to the crankshaf t journals.

(5)

Clean and inspect main bearing halves (5 and 6) from no. 1 and no. 7 main bearings

positions, Cleaning Steps (1) and (2), Inspection Steps (1), (3), (4), and (5).

(6)

Check main bearing halves (5 and 6) bearing position no. 1 clearance.

(a)

If main bearing halves (5 and 6) are coated with oil, remove oil with a clean wiping rag.

WARNING

Drycleaning Solvent (P-D-680) is TOXIC and flammable. Wear protective goggles and

gloves; use only in a well-ventilated area; avoid contact with skin, eyes, and clothes;

and do not breathe vapors. Keep away from heat or flame. Never smoke when using

solvent; the flashpoint for type I drycleaning solvent is 100F (38C), type II is 138F

(59C), and type III is 200F (93.3C). Failure to do so may result in injury or death to

personnel.

If personnel become dizzy while using cleaning solvent, immediately get fresh air and

medical help. If solvent contacts skin or clothes, flush with cold water. If solvent

contacts eyes, immediately flush eyes with water and get immediate medical

attention.

CAUTION

To help prevent damage to the cylinder block during main bearing bore cleaning,

compressed air shall not exceed 15 psig (103.43 kPa). Use compressed air only with

effective chip guarding and personal protective equipment.

(b)

Clean main bearing halves (5 and 6) surfaces in the cylinder block and bearing caps with

drycleaning solvent P-D-680. Dry surfaces thoroughly with low pressure compressed air

(15 psig [103.43 kPa] max.).

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