Cummins/Onan — Crankshaft Pulley / Front Seal - Installation
Repair & overhaul · Crankshaft pulley/front seal
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.
Procedure
- Apply clean engine oil to crankshaft front seal bore.
- Using special tools 303-102 and 303-1251, install crankshaft front seal.
- Lubricate front seal and crankshaft pulley with clean engine oil.
- Using special tools 303-335 and 303-102, install crankshaft pulley.
- Install new crankshaft bolt and washer; tighten: 120 Nm, loosen 1 turn, 50 Nm, 90 degrees.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Crankshaft pulley bolt: Stage 1: 120 Nm; Stage 2: loosen 1 turn; Stage 3: 50 Nm; Stage 4: 90 degrees
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.