Cummins/Onan 20W-20 — NOZZLE INSTALLATION

For the Cummins/Onan 20W-20.

Applies to: Cummins Onan 20W 20

Procedure

1. Install a new heat shield to head gasket in cylinder head recess.
2. Install heat shield, heat shield gasket, second heat shield, and nozzle gasket.
3. Insert nozzle assembly into recess. Do not strike tip against any hard surface.
4. Install nozzle flange and two cap screws. Tighten cap screws alternately to avoid cocking nozzle assembly. Tighten each to 20-21 foot-pounds (27- 28 N«m). CAUTION Never use hard or sharp tools, emery paper, grinding powder or abrasives of any kind or the nozzles may be damaged beyond use. Soak each nozzle in fuel to loosen dirt. Then clean the inside with a small strip of wood soaked in oil and the spray hole with a wood splinter. If necessary, clean the outer surfaces of the nozzle body with a brass brush but do not attempt to scrape carbon from the nozzle surfaces. This can severely damage the spray hole. Use a soft oil-soaked rag or mutton tallow and felt to clean the nozzle valve.

Source: manual:974-0251 Onan RDJF Engine Service and Parts Manual (3-1980).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.