Item
Crankpin diameter
Radial clearance
between bearing
and crankpin
Specifications
Standard
58 -0.035
-0.055
(2 283 -0.00138)
.
-0.00217
0.035 - 0.100
Unit: mm (in.)
Repair
limit
0.20
(0.00138 - 0.00394) (0.0079)
To measure the inside diameter of the bearing,
the bearing fitted to each connecting rod must
be secured by tightening the cap bolts to
S
.5 kg-m
(39
.8 lb-ft). Measure the diameter in two
positions, 1 and 2, and in two directions
D1
and
D2,
as shown below. Obtain the average by the follow
ing formula:
DI+ D2
D•---
2
2
Positions for miking connecting rod bearing
(c) Check the contact pattern of bearing on
crankpin by fitting the big end in the normal
manner to the crankpin, with the crankshaft
laid out on the bench, and by using a paste of
red lead or Prussian blue to visualize the con
tact. Be sure to tighten the cap bolts to the
specified torque, that is, 5 .5 kg-m
(39
.8 lb-ft). The
contact should occur over at least
75%
of the
entire surface; if not, replace the bearing.
[NOTE)
The above job of checking the contact pattern
may be eliminated where the crankpin is ground
to the specified tolerance and the bearing has
been replaced. This is because a replacement
bearing is precision-finished to ensure the speci
fied extent of contact.
Miking connecting rod bearing
