Connecting Rod Bearing

CONNECTING ROD BIG END DIAMETER





^ Install connecting rod bearing cap without installing connecting rod bearing, and tightening connecting rod bolts to the specified torque.
^ Measure the inner diameter of connecting rod big end with an inside micrometer.
Standard: 55.000 - 55.013 mm (2.1654 - 2.1659 inch)
^ If out of the standard, replace connecting rod assembly.

CONNECTING ROD BUSHING OIL CLEARANCE
Connecting Rod Bushing Inner Diameter





Measure the inner diameter of connecting rod bushing with an inside micrometer.
Standard: 22.000 - 22.012 mm (0.8661 - 0.8666 inch)

Piston Pin Outer Diameter





Measure the outer diameter of piston pin with a micrometer.
Standard: 21.989 - 22.001 mm (0.8657 - 0.8662 inch)

Connecting Rod Bushing Oil Clearance
(Connecting rod bushing oil clearance) = (Connecting rod bushing inter)
Standard: 0.005 - 0.017 mm (0.0002 - 0.0007 inch)
Limit: 0.030 mm (0.0012 inch)
^ If the calculated value exceeds the limit, replace connecting rod assembly
^ If replacing piston and piston pin assembly, refer to EM-136, HOW TO SELECT PISTON. How to Select Piston and Bearing





^ If replacing connecting rod assembly, refer to EM-147, CONNECTING ROD BEARING OIL CLEARANCE to select the connecting rod bearing.

Factory installed parts grading:
^ Service parts apply only to grade 0.








CONNECTING ROD BEARING OIL CLEARANCE
Method by Calculation





^ Install connecting rod bearings to connecting rod and connecting rod cap, and tighten connecting rod bolts to the specified torque.
^ Measure the inner diameter of connecting rod bearing with an inside micrometer.
(Oil clearance) = (Connecting rod bearing inner diameter) - (crankshaft pin journal diameter)
Standard: 0.034 - 0.059 mm (0.0013 - 0.0023 inch) (actual clearance)
Limit: 0.070 mm (0.0028 inch)
^ If the calculated value exceeds the limit, select proper connecting rod bearing according to connecting rod big end diameter and crankshaft pin journal diameter to obtain the specified bearing oil clearance.

Method of Using Plastigage
^ Remove oil and dust on crankshaft pin journal and the surfaces of each bearing completely.
^ Cut a plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil holes.
^ Install connecting rod bearings to connecting rod and connecting rod bearing cap, and tighten connecting rod bolts to the specified torque.

CAUTION: Do not rotate crankshaft.





^ Remove connecting rod bearing cap and bearings, and using the scale on the plastigage bag, measure the pasturage width.

NOTE: The procedure when the measured value exceeds the limit is same as that described in the Method by Calculation.

CONNECTING ROD BEARING CRUSH HEIGHT





^ When connecting rod bearing cap is removed after being tightened to the specified torque with connecting rod bearings installed, the tip end of bearing must protrude.
Standard: There must be crush height.
^ If the standard is not met, replace connecting rod bearings.

CONNECTING ROD BOLT OUTER DIAMETER





^ Measure the outer diameter d at position shown in the figure.
^ If the reduction appears in a position other than d, regard it as d.
Standard: 7.90 - 8.00 mm (0.3110 - 0.3150 inch)
Limit: 7.75 mm (0.3051 inch)
^ When d exceeds the limit (when it becomes thinner), replace connecting rod bolt with new one.

CONNECTING ROD BEARING:

CONNECTING ROD BEARING

Undersize:

Undersize

Connecting Rod Bearing Oil Clearance:

Connecting Rod Bearing Oil Clearance