Service manual
CRANKSHAFT
INSPECTING
THE
CRANKSHAFT
To
check
the
crankpins
and
main journals
for
tapering and
out-of-round wear, the diameter
of
each crankpin or main
journal should be measured at two places along
the
crankpin
or
main journal, in two directions "A" and "B" each place.
If
necessary,
regrind the crankpins and main journals
to
the
next
undersize.
If
any crankpin or main journal has been
worn
beyond the service limit, replace the crankshaft.
INSPECTING
THE
CRANKSHAFT
OIL
CLEARANCE
Oil
clearance
is
calculated by subtracting the diameter
of
the
main
journal or crankpin from the inside diameter
of
the
main
bearing or rod bearing.
To
check the main bearings and
rod
bearings for tapering wear and out-of-round
wear,
the
inside
diameter
of
each main bearing or rod bearing should
be
measured. After its bearing cap is fastened at the specified
torque,
measure the bearing at two places along the length
of
the
bearing and in the directions "A" and "B" each place
as
shown.
If
necessary, replace the worn bearing with a new
one.
If
the
oil
clearance still exceeds the service limit, regrind
the
crankshaft
to
the next undersize and replace the bearing
with
one
of
the corresponding undersize.
Direction
of
installation
of
cap.
Bearing
tightening
torque:
(36
-
38
ft-lb)
(5.0- 5.5 m-kg)
FRONT
¢:=
Crankshaft
end
play;
0.002 - 0.007
in
(0.05-
0.175
mm)
19
®[]
MEASURING
MAIN
BEARING
J.D.
NOTE:
A crankshaft which
has
been sized cannot be reground
to
any undersize.
Main
Journal
Diameter
Standard
1.693in
(43mm)
Limit
-o.0275in
(-D.7Dmm)
Crankpin
Diameter
Standard
1.575in
(4Dmm)
Limit
-o.0275in
(-0.7Dmm)
Main
Journal
Undersize
Diameter
0.25
US
30.885-
30.896in
(42.715-
42.73Dmm)
.50
US
30.704-
30.715in
(42.465
•
42.48Dmm)
Crankpin
Undersize
Diameter
0.25
US
28.715
•
28.727in
(39.715-
39.73Dmm)
0.50
US
28.535
•
28.5461n
(39.465
•
39.48Dmm)
Oil
Clearance
Service
LimH
Main
Bearing
D.OD4in
(0.1Dmm)
Rod
Bearing
O.OD6in
(0.15mm)
Tightening
Torque
Main
Bearing
36
•
38
ft·lb
(5.0
-
5.5m-k)
Rod
Bearing
Cap
Nut
23
-
35
ft-lb
(3.2
•
3.5m-k)
Crankshaft
End
Play
0.002-
D.DD7in
(0.05-
0.175mm)
INSTALLING
THE
CRANKSHAFT
Refer
to
the callouts in the illustration below.
ThrUst
bearing
only
for
No.
2
cap.
:
~-•
bS/desealscoated
'
with
sealant
•
(Three
Bond
1212).
\
J:
_.-
........
\j~
Make
cap
/lush
with
cylinder
block
end
face
(common
to
front
and
rear
end
faces).
INSTAWNG
THE
CRANKSHAFT