Service manual
ENGINE
INSPECTION
CONNECTING
ROD
1.
Visual Inspection. Check the connecting rod for cracks
or other damage and,
if
necessary, replace it.
CONNECTING
ROD
PISTON
PIN
CLEARANCE
BETWEEN
THE
PISTON
PIN
AND
SMALL
END
BUSHING
4. Small end bushing replacement. Using a press, press
out the old bushing. Align the oil passages
of
the connect-
ing rod and the small end bushing; press in the new bush-
ing to the connecting rod bore. After a small end bushing
has been replaced, ream the bushing bore to obtain the
specified clearance between the small end bushing and
the piston pin.
PRESS
LARGE
END
BUSHING
CAP
'~.AQIt--
ALIGNING
REMOVING
THE
SMALL
END
BUSHING
PRESSING
IN
THE
NEW
BUSHING
MARKS
2.
Bend Inspection. Using a connecting rod aligner, check
the bend and twist
of
the connecting rod and,
if
exceeding
the limit, repair it with a press
or
replace it.
Bend
Limit
0.002
in
per
3.9
in
(0.05
mm
per
100
mm)
3.
Inspect the clearance between the piston pin
and
smaIl
end
bushing. Check the clearance between the
piston pin and the small end bushing and,
if
it exceeds the
limit, replace the piston pin
or
small bushing.
Clearance
Standard:
0.0005
-
0.0015
in
(0.012
-
0.039
mm)
Clearance
Limit:
0.002
in
(0.05
mm)
SMALL
END
OIL
HOLES
{7
NOTE:
When
reaming
the
bushing,
correctly insert
the
reamer
in
the
bushing.
In
order
to
prevent unevenness
on
the
bushing
surface,
the
reaming
should always
be
made
in
the
cutting
direction.
Make
certain the reamer
is
stopped at different positions at all
times.
5. Inspecting connecting
rod
side play. Check the connect-
ing rod side play with the dial gauge and,
if
it exceeds the
limit, replace the connecting rod and crankshaft.
Side
Play
Limit
0.016
in
(0.40
mm)
,
.
CONNECTING
ROD
SIDE
PLAY
TEST
Engines & Generators
19