6A2-86 ENGINE MECHANICAL (M13 ENGINE)
• Upper half of bearing (1) has an oil groove (2) as shown in
figure.
Install this half with oil groove to cylinder block.
• Lower half of bearing does not have an oil groove.
Visual inspection
Check bearings for pitting, scratches, wear or damage.
If any malcondition is found, replace both upper and lower halves.
Never replace either half without replacing the other half.
Main bearing clearance
Check clearance by using gaging plastic according to the follow-
ing procedure.
1) Remove bearing caps.
2) Clean bearings and main journals.
3) Place a piece of gaging plastic (1) the full width of bearing
(parallel to crankshaft) on journal, avoiding oil hole.
4) Tighten main bearing cap No.1 bolts (1) – (10) and main
bearing No.2 cap 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 a), tighten them to 50 N·m
(5.0 kg-m, 36.5 lb-ft).
c) In the same manner as in step a), 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 bolt (1) – (10)
: Tighten 30 N·m (3.0 kg-m, 22.0 lb-ft), 50 N·m (5.0 kg-m,
36.5 lb-ft) and 60° by the specified procedure.
Main bearing cap No.2 bolt (11) – (20)
: Tighten 25 N·m (2.5 kg-m, 18.0 lb-ft) by the specified pro-
cedure.
CAUTION:
Do not rotate crankshaft while gaging plastic is installed.
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