Perkins 103-06 Workshop Manual page 28

- Reassembly
A. Reassemble the bearing holder, centre bearing
and thrust washer as follows:
a. Face the chamfered part of the bearing
holder toward front. Install the bearing holder
which has reference bit at the centre. Then
install the bearing holder on which the thrust
washer is to be mounted at the flywheel side (
where fitted).
b. Install the thrust washer. (103.09/10/Perama
M25/M30). Face its oil groove toward thrust
face of the crankshaft.
Tightening torque of the bearing holder: (2.5-
3.0 kgf.m) (18.1-21.71bf ft) - 103-09/10/ Perama
M25/30, (2.0-2.5 kgf m) (14.5-18.1 lbf ft) -
103-06.
c. Set the bearing with oil groove to upper part,
while setting the bearing without the groove
to lower part.
T i g r o o v e
-
Notch
Crankshaft Bearing (bush) -
Inspection
A. Check the bearing (bush) for peeling, melting,
seizure or poor contact. If found to be defective,
replace.
B. Using cylinder gauge and micrometer, measure
the oil clearance between the bearing (bush)
and the crankshaft journal.
C. Measure inside diameters at positions 1 and 2
(1085). At each position, measure in both direc-
tions A and B as shown. The oil clearance can
be obtained by subtracting this value from the
maximum crankshaft journal diameter.
103-09/10/Perama M25/M30
Standard oil clearance
0.039-0.106mm
(.0015-.0041")
103-06
0.035-0.102mm
(.0014-.0040")
D. If the oil clearance exceeds the allowable limit,
replace the bearing (bush). Or, grind the
crankshaft journal. In this case, use undersize
bearing (bush).
E. When replacing the crankshaft journal (bush),
use a press to install.
Crankshaft journal (bush)
103-09/10/Perama M25/M30
Size
Standard
0.25mm
U. S.
(.0098")
0.50mm
U. S.
1085
(0196")
Allowable limit
0.2mm
(.0078")
0.2mm
(.0078")
PB052
PB053
Cord number Outside diameter
198517080 45.964-45.975mm
(1.8096-1.8100")
198517084 45.714-45.725mm
(1.7997-1.8001 ')
198517087 45.464-45.475mm
(1.7899-1.7903")