Cummins/Onan — Raw Water Pickup Test
Testing & diagnosis · Raw water cooling system
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MDKAV, Cummins/Onan MDKAW, Cummins/Onan MDKAZ, Cummins/Onan MDKB, Kubota D1105 engine, Kubota V1305 engine, Kubota V1505 engine, Kubota V1903B engine, Kubota V2203B engine, Kubota V2803B engine
Before you start
- Be ready to close the sea cock and catch water that spills.
Procedure
- Load the boat fully for sea trials, shut down the genset, and disconnect the raw water pickup hose from the genset bulkhead fitting.
- Raise and lower the end of the hose; the water line is where water just begins to spill.
- Mark the highest water line observed while operating the boat throughout its speed range, and mark the line while docked.
- If either water line is within 6 inches (152 mm) of the engine exhaust-water mixer, install a siphon-break device.
Specs & values
- 6 in (152 mm) minimum separation from exhaust-water mixer
Full service-parts list: Cummins/Onan MDKAV →, Cummins/Onan MDKAW →, Cummins/Onan MDKAZ →, Cummins/Onan MDKB →, Kubota D1105 engine →, Kubota V1305 engine →, Kubota V1903B engine →
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.