Cummins/Onan — Crankshaft Pulley - Installation
Installation
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Do not reuse the crankshaft pulley bolt.
- Only hand-tighten the bolt or damage to the front cover can occur.
Procedure
- Apply clean engine oil to crankshaft front seal.
- Install crankshaft pulley, washer and hand-tighten new bolt.
- Install a standard 6mm x 70mm bolt to align pulleys.
- Remove all special tools and 6mm bolt.
- Turn engine 2 complete revolutions to TDC.
- Torque crankshaft bolt 100 Nm (74 lb-ft) then rotate additional 90 degrees.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Crankshaft bolt 100 Nm (74 lb-ft) plus 90 degrees
- Plug bolt 20 Nm (15 lb-ft)
Source: Cummins/Onan 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.