Service Manual, General Motors 4.3L Engine (TP ... - Kohler Power

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6-80 Marine/Industrial 4.3L Engine 188015 Bearing Clearance Measuring Procedures The crankshaft bearings are of the precision insert type and do not use shims for adjustment. If the clearances are excessive, then new upper and lower crankshaft bearings will be required. The service crankshaft bearings are available in the standard size and an undersize. The selective fitting of the crankshaft bearings are necessary in production in order to obtain close tolerances. For this reason, in one journal bore you may use one-half of a standard crankshaft bearing with one-half of an undersize crankshaft bearing. Important: Do not use the plastic gauge method to measure connecting rod bearing clearances. The plastic gauge method for measuring connecting rod bearing clearances will result in unreliable measurements. Use only the micrometer method to correctly determine the connecting rod bearing clearances. In order to determine the correct replacement crankshaft bearing size, the crankshaft bearing clearance must be measured accurately. Either the micrometer or plastic gauge method may be used; however, the micrometer method gives more reliable results and is preferred. Micrometer Method for Crankshaft Bearings 1. Measure the crankshaft journal diameter with a micrometer in several places, approximately 90 degrees apart, and then average the measurements. 2. Determine the taper and the out-of-round of the crankshaft journal. Refer to Engine Mechanical Specifications. 3. Install the crankshaft bearings into the engine block. 334338 2000 Marine/Industrial
Engine Marine/Industrial 4.3L 6-81 4. Install the crankshaft bearings into the crankshaft bearing caps. 334342 5. Install the crankshaft bearing caps in the original positions and with the arrow on the crankshaft bearing caps in the direction of the front of the engine block. Notice: Refer to Fastener Notice in Cautions and Notices. 6. Install the crankshaft bearing cap bolts. Tighten 6.1. Tighten the crankshaft bearing cap bolts on the first pass to 20 N•m (15 lb ft). 6.2. Tighten the crankshaft bearing cap bolts on the final pass an additional 73 degrees using the J 36660. 7. Measure the crankshaft bearing inside diameter (ID) at the top and the bottom using an inside micrometer. 8. In order to determine the crankshaft bearing clearance, subtract the journal diameter from the crankshaft bearing ID. 9. Compare the crankshaft bearing clearance to the specifications. Refer to Engine Mechanical Specifications. 10. If the crankshaft bearing clearances exceeds specifications, install the new crankshaft bearings as follows: 10.1. Measure the crankshaft bearing inside diameter (ID) at the top and the bottom using an inside micrometer. 10.2. Compare the crankshaft bearing clearance to the specifications. Refer to Engine Mechanical Specifications. 11. Replace or repair the crankshaft if the proper clearances cannot be obtained. 353091 2000 Marine/Industrial
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Service Engine Engine Model: Genera
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Table of Contents Caution Introduct
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Table of Contents, continued Valve
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Introduction This service manual pr
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Cautions and Notices Definition of
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Engine Marine/Industrial 4.3L 6-1 E
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Service Manual, General Motors 4.3L Engine (TP ... - Kohler Power

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