Cummins/Onan — Nozzle Assembly
Repair & overhaul · Injection nozzle
From a Cummins/Onan service manual covering: 2.5A, 2.5L, 2.7 AJ, 4.0CCK, 6.0CCKB, 6.5 NH, JC - 3CR / 96 T. Check it applies to your exact model before use.
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Before you start
- Never interchange components between nozzles.
Procedure
- Remove all pressure on nozzle spring by adjusting pressure adjusting screw.
- Clamp nozzle holder body in a vise.
- Set valve in body and set nozzle over it.
- Install nozzle cap nut loosely.
- Place centering sleeve over nozzle for initial tightening, then remove to prevent binding.
- Tighten nozzle cap nut to specified torque.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.