21-6 Crank Mechanism
Con Rods, Inspection
1
Check the connecting rods for cracking, straight-
ness and twist before any piston pin bush
replacement.
Scrap the connecting rod if it is cracked, bent or
twisted.
Check the wear in the "small end" with a piston pin.
When the clearance is correct, an oiled piston pin
should slowly slide through the bush under its own
weight.
2
Use a new piston pin and measure connecting
rod straightness in a fixture. Max. deviation: 0.15
mm (0.0059") per 100 mm (3.9") measured
length.
3
Measure connecting rod twist. Max. deviation:
0.20 mm (0.0079") per 100 mm (3.9") measured
length.
4
Check the end float between the connecting rod
and crankshaft. Change the connecting rod if the
end float exceeds 0.035 - 0.085 mm (0.0014–
0.0033").
Also check the connecting rod bushes. For per-
missible clearance between the piston pin (
A
)
and the connecting rod bush (
B
Changing the piston pin bushing
1
Press the old bush out.
2
Press the new bush in.
NOTICE!
Make sure that the oil hole in the bush
lines up with the drilling in the connecting rod.
Using a felt tip pen, draw a line across the hole in
the connecting rod and the bush. Check that the
oil duct is open after pressing in the new bush.
3
Ream the bush and measure the connecting rod
with an internal dial gauge.
P0008163
A
B
P0008023
P0008024
21-6 Crank Mechanism
88
47701798 05-2013 © AB VOLVO PENTA
Summary of Contents for D1-13
Page 1: ...Group 21 26 Workshop Manual 2 0 A D1 13 D1 20 D1 30 D2 40 ...
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Page 133: ...References to Service Bulletins Group No Date Refers to 131 ...
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Page 136: ...47701798 English 05 2013 ...