Connecting Rod Bearing: Service and Repair

HOW TO SELECT PISTON AND BEARING


Connecting Rod Bearing


WHEN NEW CONNECTING ROD AND CRANKSHAFT ARE USED
1. Apply connecting rod big end diameter grade stamped (D) on connecting rod side face to the row in the "CONNECTING ROD





BEARING SELECTION TABLE".





2. Apply crankshaft pin journal diameter grade stamped on crankshaft front side to the column in the "CONNECTING ROD
BEARING SELECTION TABLE"
3. Read the symbol at the cross point of selected row and column in the "CONNECTING ROD BEARING
SELECTION TABLE".
4. Apply the symbol obtained to the "CONNECTING ROD BEARING GRADE TABLE" to select connecting rod bearing.

WHEN CONNECTING ROD AND CRANKSHAFT ARE REUSED
1. Measure the connecting rod big end diameter. Refer to Specifications.
2. Check that the connecting rod big end diameter is within the standard value.
3. Measure the crankshaft pin journal diameter. Refer to Specifications.
4. Determine the grade of crankshaft pin diameter grade by corresponding to the measured dimension in "Crankshaft pin journal diameter" column of "CONNECTING ROD BEARING SELECTION TABLE".
5. Select connecting rod bearing of the same grade.

CONNECTING ROD BEARING SELECTION TABLE






CONNECTING ROD BEARING GRADE TABLE

Connecting rod bearing grade table : Refer to EM-149, "Connecting Rod Bearing". Specifications


UNDERSIZE BEARING USAGE GUIDE
- When the specified connecting rod bearing oil clearance is not obtained with standard size connecting rod bearings, use undersize (US) bearings.
- When using undersize (US) bearing, measure the connecting rod bearing inner diameter with bearing installed, and grind crankshaft pin so that the connecting rod bearing oil clearance satisfies the standard.

CAUTION:
In grinding crankshaft pin to use undersize bearings, keep the fillet R (A) [1.5 - 1.7 mm (0.059 - 0.067 in)].






Bearing undersize table : Refer to EM-149, "Connecting Rod Bearing". Specifications