Suzuki DF 25 Service Manual page 167

7-50 POWER UNIT
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 only one half of a
bearing set.
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 (crankcace, 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.
(3) Install crankshaft to cylinder.
(4) Place piece of Plastigauge across full width of bearing
(paralel to crankshaft) on journal.
Do not place Plastigauge over oil hole.
09900-22301 : Plastigauge
NOTE:
Do not rotate crankshaft while Plastigauge is installed.
Upper half Lower half
Plastigauge