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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6-80 Marine/Industrial <strong>4.3L</strong> <strong>Engine</strong><br />
188015<br />
Bearing Clearance Measuring Procedures<br />
The crankshaft bearings are of the precision insert type and do not<br />
use shims for adjustment. If the clearances are excessive, then<br />
new upper and lower crankshaft bearings will be required. The<br />
service crankshaft bearings are available in the standard size and<br />
an undersize.<br />
The selective fitting of the crankshaft bearings are necessary in<br />
production in order to obtain close tolerances. For this reason, in<br />
one journal bore you may use one-half of a standard crankshaft<br />
bearing with one-half of an undersize crankshaft bearing.<br />
Important: Do not use the plastic gauge method to measure<br />
connecting rod bearing clearances. The plastic gauge method for<br />
measuring connecting rod bearing clearances will result in<br />
unreliable measurements. Use only the micrometer method to<br />
correctly determine the connecting rod bearing clearances.<br />
In order to determine the correct replacement crankshaft bearing<br />
size, the crankshaft bearing clearance must be measured<br />
accurately. Either the micrometer or plastic gauge method may be<br />
used; however, the micrometer method gives more reliable results<br />
and is preferred.<br />
Micrometer Method for Crankshaft Bearings<br />
1. Measure the crankshaft journal diameter with a micrometer<br />
in several places, approximately 90 degrees apart, and then<br />
average the measurements.<br />
2. Determine the taper and the out-of-round of the crankshaft<br />
journal. Refer to <strong>Engine</strong> Mechanical Specifications.<br />
3. Install the crankshaft bearings into the engine block.<br />
334338<br />
2000 Marine/Industrial