Perkins 103-06, Workshop Manual

Page: 26 / 80

Bearing Holder
- Disassembly and Inspection
A.
Centre bearing
a. Remove the bearing holder, and check it for
peeling, melting, stepped wear and other
damage. If it is excessively damaged,
replace.
b. Using the plastigauge, measure the oil clear-
ance between the crankshaft centre journal
and the bearing.
If the oil clearance is more than the allowable
limit, replace the bearing. Or, grind the
crankshaft centre journal, and use under-
sized bearing (Refer to "Crankshaft").
103-09/10/Perama M25/M30
Bearing Journal Part No. Crankshaft
size No. center journal
diameter
No.1 198517330* 42.964-42.975
S.TD. No.2 198517340 (1.6915-1.6919")
No. 3 198517101 45.964-45.975
198517110 (1.8096-1.8100")
No. 1 198517334' 42.714-42.725
U.S0.25 No.2 198517344 (1.6817-1.6821")
(.010") No.3 198517105* 45.714-45.725
198517114 (1.7998-1.8002")
No. 1 198517337* 42.464-42.475
U.S 0.50 No.2 198517347 (1.6718-1.6722")
(.020") No.3 198517108* 45.464-45.475
198517117 (1.7899-1.7904")
Standard oil clearance
Allowable limit
Upper bearing
0.039-0.092mm
(.0015-.0036")
0 2mm (
0078)
No 3
No. 2 No. 1
Bearing Bearing Crankshaft
size Number centrejournal
diameter (mm)
Standard 198517101' 45.964-45.975mm
198517110 (1,8096-1.8100")
0.25mm 198517105* 45.714-45.725mm
U.S. 198517114 (1.7997-1.8001")
(.0098")
0.50mm
198517108* 45.464-45.475mm
U.S. 198517117 (1.7899-1.7903")
(.0196")
Front
PB049
B. Thrust clearance 103-06
Check the thrust clearance for wear, poor contact,
burning or other defects.
N.B. No thrust washers are fitted.
Upper bearing
Standard clearance Allowable limit
103-06
Bearing
Holder
0.1 to 0.3mm
(.004-012")
0.5mm
(.020")
Journal
No.
Standard oil
clearance
Allowable limit
Thrust washers. 103-09/10/Perama M25/M30
No. 1, 2 0.035-0.088 0.2
Check the thrust washer for wear, poor contact,
(.0014-.0035") (.008") burning or other defects. Defective washers
No.3 0.039-0.092 0.2 must be replaced.
(.0015-.0036") (.008")
Standard Thickness Allowable limit
1.95-2.0mm (.
0767-.0787")
1 8mm (
0708 )