Power Solutions International — Steps to assemble crankshaft group
Repair & overhaul
From a Power Solutions International service manual — check it applies to your exact model before use.
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Before you start
- Shell with bump damage should not be reused even if repaired
- Misalignment exceeding 1/5~1/4 of oil hole is strictly forbidden
Procedure
- Clean up cylinder bottom holes
- Press main bearing upper shell into cylinder bottom holes; align to oil hole and oil groove
- Apply clean lubricating oil on inner surface of upper bearing shell
- Clean undersurface of cylinder block; apply sealant properly
- Clean crankshaft oil holes with compressed air; drop crankshaft into cylinder body slowly
- Clean upper thrust plate and press into cylinder body; oil groove faces crankshaft
- Place oil seal into seal groove on cylinder undersurface with dedicated tool
- Press lower bearing shell and lower thrust plate into crankcase
- Apply clean oil on crankcase bolt bearing surface and main bearing bolt thread
- Pre-tighten main bearing bolts to 70Nm, then tighten each bolt 90°±4°
Tools required
- dedicated tool Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Pre-tighten main bearing bolts to 70Nm then 90°±4°
Source: Power Solutions International service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.