Cummins/Onan — Timing Chain - Installation
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Install timing chain with colored links aligned with VCT unit and crankshaft sprocket timing marks.
- Install lower LH timing chain guide and bolts. Tighten to 10 Nm (89 lb-in).
- Install timing chain tensioner arm.
- Release ratchet detent; compress ratchet plunger and install lockpin.
- Install timing chain tensioner and bolts. Tighten to 10 Nm (89 lb-in); remove lockpin.
- Verify 48 links between RH intake VCT and LH intake VCT colored links; 35 links between LH intake VCT and crankshaft sprocket links.
Specs & values
- Timing chain guide bolts: 10 Nm
- Timing chain tensioner bolts: 10 Nm
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.