TM 5-3805-258-24-2
ENGINE
DISASSEMBLY AND ASSEMBLY
CRANKSHAFT MAIN BEARINGS
CAUTION
Make sure the part number on the main bearing
cap is toward the front of the engine and the
number on the main bearing cap is the same as
the number on the cylinder block on the left
side of each main bearing cap.
NOTE: Do not turn the crankshaft when Plastigage
(B) is in
b)
Do not
position.
Install main bearing caps (1) for No. 1 and
3 and 5 main bearings. Put clean engine oil
on the bolt threads and the face of the
washers and install the bolts. Tighten the
bolts to a torque of 40 ± 4 N·m (30 ± 3
lb. ft.).
CAUTION
use an impact wrench to tighten the
bolts the additional 90°.
7.
8.
9.
c)
d)
Put a mark on each bolt and main bearing
cap, then tighten the bolts 90° more.
Remove the main bearing caps for No. 1, 3
and 5 main bearings. Remove Plastigage
(B) and measure the width of the Plasti-
gage. The main bearing clearance must be
0.076 to 0.165 mm (.0030 to .0065 in.).
Maximum permissible clearance with used
bearings is 0.25 mm (.010 in.).
Install main bearing caps (1) and tighten the
bolts as in Steps 6b and 6c.
Remove No. 2 and 4 main
Steps 2, 3, 4, 6 and 7 for the
bearings.
Check the crankshaft end
bearing caps. Do
No. 2 and 4 main
play with tooling
(C). The end play is controlled by the thrust
bearings on the No. 5 main bearing. End play
with new bearings is 0.064 to 0.368 mm (.0025
to .0145 in.). The maximum permissible end
play with used bearings is 0.64 mm (.025 in.).
end by:
a) install oil pan plate
b) install oil pump
5-144
