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2) Tighten main bearing cap No.1 bolts (1) – (10) and main
bearing cap No.2 bolts (11) – (20) gradually as follows.
a) Tighten bolts (1) – (10) to 30 N·m (3.0 kg-m, 22.0 lb-ft)
according to numerical order in figure.
b) In the same manner as in Step 1), tighten them to 50 N·m
(5.0 kg-m, 36.5 lb-ft).
c) In the same manner as in step 1), retighten them to 60°.
d) Tighten bolts (11) – (20) to 25 N·m (2.5 kg-m, 18.0 lb-ft)
according to numerical order in figure.
Tightening torque
Main bearing cap No.1 bolts (1) – (10) :
30 N·m (3.0 kg-m, 21.5 lb-ft), 50 N·m (5.0 kg-m, 36.5 lb-ft)
and then retighten by turning through 60 °
Main bearing cap No.2 bolts (11) – (20) :
25 N·m (2.5 kg-m, 18.0 lb-ft)
3) Use a dial gauge to read displacement in axial (thrust) direc-
tion of crankshaft.
If its limit is exceeded, replace thrust bearing with new stan-
dard one or oversize one to obtain standard thrust play.
Crankshaft thrust play
Standard : 0.11 – 0.31 mm (0.0043 – 0.0122 in.)
Limit : 0.35 mm (0.0138 in.)
NOTE:
After checking the thrust play, make sure that thread
deformation of each main bearing cap No.1 bolt referring
to "Main bearing cap No.1 bolt" in this section.
Out-of-round and taper (uneven wear) of journals
An unevenly worn crankshaft journal shows up as a difference in
diameter at a cross section or along its length (or both). This dif-
ference, if any, is determined by taking micrometer readings. If
any one of journals is badly damaged or if amount of uneven
wear in the sense explained below exceeds its limit, regrind or
replace crankshaft.
Crankshaft out-of-round and taper
Limit : 0.01 mm (0.0004 in.)
Out-of-round : A – B
Taper : a – b
Main bearings
General information
• Service main bearings are available in standard size and
0.25 mm (0.0098 in.) undersize, and each of them has 5
kinds of bearings differing in tolerance.
ENGINE MECHANICAL (M13 ENGINE) 6A1-85
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