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CRANKSHAFT/TRANSMISSION 9-17
Crankshaft and Connecting Rods
Connecting R od Bend
•
Remove the connecting rod big end bearing inserts, and
reinstall t he connecting rod big end cap.
•
Select an arbor [A] of the same diameter as the connect-
ing rod big end, and insert the arbor through the connect-
ing rod big end.
•
Select an arbor of the same diameter as the piston pin
and at least 100 mm (3.94 in.) long, and insert the arbor
[B] through the connecting rod small end.
•
On a surface plate, set the big-end arbor on V block [C].
•
With the connecting rod held vertically, use a height
gauge to measure the difference in the height of the
arbor above the surface plate over a 100 mm (3.94 in.)
length to determine the amount of connecting rod bend.
If connecting rod bend exceeds the service limit, the con-
necting rod must be replaced.
Connecting Rod Bend
Service Limit: TIR 0.2/100 mm (0.008/3.94 in.)
Connecting Rod Twist
•
With the big-end arbor [A] still on V block [C], hold the
connecting rod horizontally and measure the amount that
the arbor [B] varies from being paralleled with the surface
plate over a 100 mm (3.94 in.) length of the arbor to de-
termine the amount of connecting rod twist.
If connecting rod twist exceeds the service limit, the con-
necting rod must be replaced.
Connecting Rod Twist
Service Limit: TIR 0.2/100 mm (0.008/3.94 in.)
Connecting Rod Big End Side Clearance
•
Measure connecting rod big end side clearance.
○
Insert a thickness gauge [A] 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 t he con-
necting rod with new one and then check clearance again.
If clearance is too large after connecting rod replacement,
the crankshaft also must be replaced.