Cummins/Onan 14GSBB / 20GSBB — Changing Engine Oil and Oil Filter
Maintenance
For the Cummins/Onan 14GSBB / 20GSBB, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan GSBB
Before you start
- Used engine oil can cause cancer or reproductive toxicity; avoid skin contact and breathing of vapors
Parts for this job
- 51243 Oil filter Amazon eBay $10.00 NAPA $11.16
Part numbers from the service-parts list for Cummins/Onan GSBB. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Run the generator set until warm, shut down and place pan under end of oil drain hose
- Make sure oil drain hose is connected to drain valve; open drain valve; reclose when oil stops draining
- Spin off the oil filter canister and clean the filter mounting surface; remove old gasket if it remains
- Apply thin film of clean oil to new filter gasket; spin new filter on until gasket touches block, then turn additional 1/2 to 3/4 turn
- Refill with 67 oz (2 liters) of oil
- Start and run for 30 seconds
- Shut engine off and wait 5 minutes
- Add more oil slowly to bring oil level to the FULL mark on dipstick
- Dispose of used oil and oil filter according to local environmental regulations
Specs & values
- Refill with 67 oz (2 liters) of oil
Full service-parts list: Cummins/Onan GSBB →
Source: Cummins/Onan operator's 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.