Cummins/Onan — Injection Nozzle Installation
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- A dirty mounting surface could permit blow-by, causing nozzle failure and resulting power loss.
Procedure
- Thoroughly clean each mounting recess.
- Install a new heat shield-to-head gasket in cylinder head recess.
- Install heat shield, a new nozzle gasket and nozzle adapter.
- Insert nozzle assembly into recess; do not strike tip against any hard surface.
- Install nozzle flange and two cap screws, tightening alternately to avoid cocking.
- Tighten each cap screw to 20-21 foot-pounds (27-28 N·m).
Specs & values
- Nozzle mounting cap screws 20-21 ft-lb (27-28 N·m)
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.