Home » Duramax LLY » Duramax LLY – ENGINE DISASSEMBLY – Crankshaftand Main Bearings Removal

Duramax LLY – ENGINE DISASSEMBLY – Crankshaftand Main Bearings Removal

1. Inspect main bearing caps. Note if caps have factory I.D. markings on them. However, if caps do not have factory marks, it will be necessary to mark each cap with a center punch, or scriber. Main caps must be reinstalled in same location and direction, to maintain bore alignment for crankshaft journals (Figure 2-98).

2. Remove rear main oil seal.

3. Remove main bearing cap bolts. Discard bolts.

4. Tap main bearing caps with rawhide mallet to loosen.
Then lift and remove caps. Keep them in order of removal (Figure 2-99).

5. Lift crankshaft out of bearing saddles in block. Place crankshaft on bench for cleaning and inspection.

6. Remove main bearing upper halves from block. Keep bearing halves for inspection and select fit reference.

 

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