6-53 POWER UNIT
CRANKSHAFT JOURNAL OIL CLEARANCE
Check clearance using Plastigauge according to the following
procedure.
NOTE:
Assemble each bearing in its original position before checking
clearance.
(1) Clean surface of bearing holder (crankcase, and cylinder),
bearing, and main bearing journal.
(2) Install main bearing to cylinder and crankcase.
NOTE:
• Align the tab
a
of bearing with notch in cylinder and crank-
case.
• Do not apply engine oil to bearing.
• Install the bearing half with oil hole / groove to cylinder side.
(3) Install crankshaft to cylinder.
(4) Place a piece of Plastigauge across full width of bearing
(parallel to crankshaft) on journal.
Do not place Plastigauge over oil hole.
09900-22301 : Plastigauge
NOTE:
Do not rotate crankshaft while Plastigauge is installed.
Plastigauge
CRANKSHAFT MAIN BEARING
Check bearings for pitting, scratches, wear or damage.
If any improper condition is found, replace both upper and lower
halves.
Always replace both bearing halves, never replace only one
half of a bearing set.
z
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