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Installation - continued - TM-10-3930-673-340184
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Installation - continued - TM-10-3930-673-340186
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.).
3-83

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