Cummins/Onan JWC4-10S-3 — Filling the Cooling System
Maintenance
For the Cummins/Onan JWC4-10S-3, from the Cummins/Onan service manual.
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Before you start
- Do not add cold water to an overheated engine; allow it to cool and add water slowly while running.
Procedure
- Close drain cocks on cylinder block and radiator.
- Fill radiator with clean water or anti-freeze solution to 1 inch from bottom of filler neck.
- Check all connections for water leaks and correct any found.
Specs & values
- Fill to 1 inch from bottom of filler neck
- Capacity 15-1/2 quarts
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.