Service Manual, General Motors 4.3L Engine (TP ... - Kohler Power
Service Manual, General Motors 4.3L Engine (TP ... - Kohler Power
Service Manual, General Motors 4.3L Engine (TP ... - Kohler Power
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6-82 Marine/Industrial <strong>4.3L</strong> <strong>Engine</strong><br />
188015<br />
Micrometer Method for Connecting Rod Bearings<br />
Notice: Do not shim, scrape or file bearing inserts. Do not touch<br />
the bearing surface of the insert with bare fingers. Skin oil and<br />
acids will etch the bearing surface.<br />
1. Measure the crankpin diameter with a micrometer in several<br />
places, approximately 90 degrees apart, and then average<br />
the measurements.<br />
2. Determine the taper and the out-of-round. Refer to <strong>Engine</strong><br />
Mechanical Specifications.<br />
3. Install the connecting rod bearings into the connecting rod<br />
cap and the connecting rod.<br />
Notice: Refer to Fastener Notice in Cautions and Notices.<br />
4. Install the connecting rod caps and the nuts.<br />
Tighten<br />
4.1. Tighten the connecting rod nuts on the first<br />
pass, evenly to 27 N•m (20 lb ft).<br />
4.2. Tighten the connecting rod nuts on the final<br />
pass an additional 70 degrees using the J 36660.<br />
5. Measure the connecting rod bearing inside diameter (ID) at<br />
the top and the bottom using an inside micrometer.<br />
6. Compare the connecting rod bearing clearance to the<br />
specifications. Refer to <strong>Engine</strong> Mechanical Specifications.<br />
7. If the connecting rod bearing clearance is within<br />
specifications, the connecting rod bearing is satisfactory.<br />
• Replace the connecting rod bearing if the clearance is not<br />
within specifications.<br />
• Always replace both the upper and the lower connecting<br />
rod bearings as an assembly.<br />
8. A standard or undersize connecting rod bearing<br />
combination may result in the proper clearance.<br />
If the proper connecting rod bearing clearance cannot be<br />
achieved using the standard or the undersize connecting rod<br />
bearings, it will be necessary to replace or repair the<br />
crankshaft.<br />
2000 Marine/Industrial