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7
1MAY 2002
Section 7
Crankshaft, Camshaft and Bearings
Section Contents
Page
CHECKING CRANKSHAFT 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CHECKING MAIN BEARING CLEARANCES 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CHECKING CONNECTING ROD BEARING CLEARANCES 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CHECKING CRANKSHAFT END PLAY 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CHECKING CAMSHAFT 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BRIGGS & STRATTON DAIHATSU 3 CYLINDER
LIQUID-COOLED DIESEL ENGINE REPAIR MANUAL (MS-1055)
CHECKING CRANKSHAFT
Inspect crankshaft journals for grooves or signs of
scoring. If found, crankshaft must be re-ground or
replaced.
1. Check the main bearing and crankpin journals for
wear and taper, Fig. 1.
Standard size:
Main – 41.976-42.000 mm (1.6526-1.6535”)
Crankpin – 36.976-37.000 mm (1.4557-1.4567”)
Maximum out of round and taper: 0.02 mm
(0.0008”).
If crankshaft journals are not within specification, the
crankshaft may be re-ground and .25 mm (.010”)
undersize bearings installed. See illustrated parts list
for part numbers.
Fig. 1 – Checking Journals
2. Check the crankshaft for run-out at #3 main
bearing journal, Fig. 2.
Maximum Run-out: 0.06 mm (0.0024”)
a. If run-out exceeds specification shown, the
crankshaft must be replaced.
Fig. 2 – Checking Run-out