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8-22 ENGINE BOTTOM END
Crankshaft and Connecting Rods
Connecting Rod Twist
•
On surface plate, set the big-end arbor [A] on V block [C].
•
Measure the difference in the heights of the arbor [B]
above the surface plate over a 100 mm (3.94 in.) dis-
tance-on the arbor to determine the amount of connect-
ing rod twist with the connecting rod held horizontally, and
using a height gauge.
If connecting rod twist exceeds the service limit, the c on-
necting rod must be replaced.
Connecting Rod Twist
Service Limit: 0.2/100 mm (0.008/3.94 in.)
Connecting Rod Big End Side Clearance
•
Measure connecting rod big end side clearance [A].
○
Insert a thickness gauge [B] between the big end and ei-
ther crank web to determine clearance.
Connecting Rod Big End Side Clearance
Standard: 0.13 ∼ 0.38 mm (0.0051 ∼ 0.0150 in.)
Service Limit: 0.58 mm (0.023 in.)
If the clearance exceeds the service limit, replace the con-
necting rod with a new one and then check clearance
again. If clearance is too large after connecting rod re-
placement, the crankshaft also must be replaced.
Connecting Rod Big End Bearing Insert/Crankpin
Wear
•
Measure the bearing insert/crankpin [B] clearance with a
plastigage [A].
NOTE
○
Tighten the connecting rod big end nuts to the specified
torque (see Connecting Rod Installation).
○
Do not move the connecting rod and crankshaft during
clearance m easurement.
Connecting Rod Big End Bearing Insert/Crankpin
Clearance
Standard: 0.041 ∼ 0.071 mm (0.0016 ∼ 0.00280 in.)
Service Limit: 0.11 mm (0.0043 in.)
If clearance is within the standard, no bearing replace-
ment is required.
If clearance is between 0.072 mm (0.00284 in.) and
the service limit (0.11 mm, 0.0043 in.), replace the
bearing inserts [A] with inserts painted blue [B]. Check
insert/crankpin clearance with the plastigage. The clear-
ance may exceed the standard s lightly, but it must not be
less than the minimum in order to avoid bearing seizure.
If the clearance e xceeds the service limit, measure the
diameter of the crankpins.
Crankpin Diameter
Standard: 38.984 ∼ 39.000 m m (1.5348 ∼ 1.5354 in.)
Service Limit: 38.97 mm (1.534 in.)