Connecting Rod, Check
Important consideration when removing/installing
fracture-split connecting rods
.
Installing a NEW connecting rod:
Carefully fix the connecting rod in a vise with soft jaw
pads.
Undo the connecting rod bolts a few turns and carefully
tap the bearing cap with a plastic faced hammer until
it loosens.
The split line can be difficult to find when the connect-
ing rod is assembled.
When the cap is separated from the connecting rod, it
may occur that a chip is missing or comes loose. This
does not affect the function of the connecting rod
adversely.
Handle the connecting rod and bearing cap carefully.
If any strike marks occur on the split line, this may
affect strength after torquing.
IMPORTANT!
If the connecting rod or bearing cap are damaged,
change the connecting rod.
Connecting Rod Bushing, Check up
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.
When the piston pin bush is changed, the bush
must be machined (trapezoid piston pin end).
When the clearance is correct, an oiled piston pin
should slowly slide through the bush under its
own weight.
2
P0006994
3
P0006995
IMPORTANT!
Regarding max. allowed straightness and twist devia-
tions, refer to
Technical Data page 27
.
2
Use a new piston pin and measure the straight-
ness of the connecting rod, using a fixture.
3
Measure connecting rod twist.
21-3 Cylinder Liner, Pistons
176
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