Replacing Main Crankshaft Bearing

Clean components before installing. See CRANKSHAFT & MAIN BEARINGS . Install main bearings with lubrication groove in block. Install main bearings without lubrication groove in main bearing caps. See Fig 1 .
CAUTION: Check crankshaft clearance. See Figure .
When crankshaft or main bearings are replaced, note that crankshaft is marked with Yellow, Green, or White paint according to tolerance of main journal. See Fig 2 . Lubricate bearings. Install crankshaft. Place main bearings with same color code as crankshaft in main bearing caps. See Fig 3 . Release hex head in main bearing cap. See Fig 4 .

Fig 1: Installing Main Bearings

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Fig 2: Identifying Crankshaft Main Journal Tolerance Markings

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Fig 3: Matching Main Bearings

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Fig 4: Releasing Hex Head

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