Crankshaft is not to be removed. Even loosening the main bearing cap nuts will cause deformation of the cylinder block bearing pedestals. This will result in reduced bearing clearance. Even if bearing shells are not renewed, a change in bearing clearance can cause bearing damage.
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If the main bearing cap nuts are loosened, the cylinder block must be renewed together with the crankshaft.
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Crankshaft bearing clearance cannot be measured using workshop equipment.
Caution