Suzuki SY413 Service Manual page 2990

6A3-82 ENGINE MECHANICAL (J18 TYPE ENGINE)
1. Lower crankcase
2. Bolt (10 mm thread diameter)
3. Bolt (8 mm thread diameter)
Main Bearings
General information
D Service main bearings are available in standard size and 0.25
mm (0.0098 in.) undersize, and standard size has 5 kinds of
bearings differing in tolerance.
To distinguish undersize bearing, it is painted red at the position
as indicated in figure. Undersize bearing thickness is 2.124 –
2.128 mm (0.0836 – 0.0837 in.) at the center of bearing.
1. Red paint
D Upper half of bearing has oil groove as shown in figure.
Install this half with oil groove to cylinder block.
D Lower half of bearing does not have oil groove.
1. Upper half of bearing
2. Oil groove
Inspect
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 following
procedure.
1) Remove lower crankcase.
2) Clean bearings and main journals.
3) Place a piece of gaging plastic to full width of bearing (parallel
to crankshaft) on journal, avoiding oil hole.
1. Gaging plastic
4) Install lower crankcase to cylinder block.
Tighten crankcase bolts, the following sequence in figure.
Tighten crankcase bolts to specified torque.
Tightening Torque
(a): 58 N·m (5.8 kg-m, 42.0 lb-ft)
(b): 27 N·m (2.7 kg-m, 19.5 lb-ft)
NOTE:
Do not rotate crankshaft while gaging plastic is installed.