TM 5-3810-295-34
NOTE
If a two-dowel pin rear main bearing cap is
(a) Tighten all screws on each cap in 50-60 ft-
serviced with a thrust half-ring containing a
lb (67.-81.3 N. m) increments to 150--160 ft-lb
single dowel hole, remove the one-fourth inch
(203.4-216.9 N m).
dowel from cap and discard. A two-dowel hole
(b) Tighten all screws in 100 ft-lb (135.6 N. m)
thrust half-ring may be used with a single-
increments to 34--350 ft-lb (461---475 N m).
dowel main bearing cap.
(c) Loosen all screws to relieve all tension.
(9) Install main bearing caps so numbers stamped
(d) Tighten all screws in 45--0 ft-lb (61.0-
on cap correspond with numbers on block. Locking
67.8 N. m) increments to 85-90 ft-lb (115.2--122.
tangs of cap and block must be on same side of block.
N. m).
NOTE
(e) Tighten all screws in 50 ft-lb (67.8 N. m)
Main bearing caps are not interchangeable.
increments to 170-180 ft-lb (230.5--244.0 N m).
(10) Coat threads of screws (1) with clean engine
(f) Advance all screws 60 in 30" increments.
oil. Lubricate washers (3) and shoulders of screw heads
(13) Check crankshaft end clearance as outlined
(1) with 140-wt. lubricant. Threads must be completely
in the following steps.
covered with an oil film and must not be damaged. In-
(a) Attach dial indicator gauge to cylinder block
stall washers (3) and start each screw (1). Set bearing
with contact point of gauge resting on crankshaft
caps in position by alternately tightening screws
flange face.
CAUTION
(b) Using a small pry bar, pry crankshaft com-
Driving main bearing caps into position may
pletely forward (toward front of the engine) Remove
dislodge lower bearing half.
pry bar and set indicator to "O."
(11) Lubricate washers (4) and threads and
(c) Pry crankshaft toward rear of engine and
shoulders of screws (2) with clean engine oil. Install
again remove pry bar. Total end clearance shall be
washers (4) and start main bearing cap side screws (2).
0.004-.016 inch with new thrust rings.
Screws will be torqued after the crankshaft end
(d) Rotate crankshaft to see that it rotates
clearance check.
freely.
(12) Tighten main bearing screws by method out-
(e) If end clearance is less than 0.005 inch,
lined below. Torquing sequence is as shown in figure
loosen screws slightly and shift crankshaft toward
14-40.
front end of engine then toward rear of engine.
Retighten screws as described in paragraph
14-38c12). Recheck end clearance.
(f.) With used thrust rings, end clearance shall
not exceed 0.022 inch. If end clearance exceeds 0.022
inch, new or oversized thrust rings must be installed.
(14) Check clearance between main bearing cap
at side screw and cylinder block area on each side.
There shall be 0.0015--.0035-inch clearance before
side screws are installed.
(15) Torque screws (2) using sequence in figure
14-41, as follows:
Figure 14-40. Main bearing or torquing sequence.
14-42
