Cummins/Onan NTA855 — Oil and Filter Change
Maintenance · Lubrication System
For the Cummins/Onan NTA855, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan DFBF, Cummins/Onan DFCB, Cummins/Onan DFCC, Cummins/Onan DFCE, Cummins/Onan DQBA, Cummins/Onan DQBB, Cummins/Onan NTA855, Cummins/Onan NT855 engine, Cummins/Onan NTA855 engine, Cummins/Onan N14 engine
Before you start
- Contact with used engine oil can cause cancer or reproductive toxicity. Do not contact oil or breathe vapors. Use rubber gloves and wash exposed skin.
- Used oil and filters must be disposed of properly. Check all federal, state and local regulations for disposal requirements.
Procedure
- Start the generator set and warm engine to operating temperature, then shut off.
- Ensure Automatic Start switch is at OFF and negative battery cable is disconnected.
- Remove oil drain plug or open drain valve; collect oil in a waste container.
- Replace drain plug or close valve; torque drain plug to 60-70 ft-lb (81-95 N•m).
- Unscrew the oil filter and discard.
- Apply light coat of oil to new filter gasket and fill filter with clean, new oil.
- Install filter; tighten 2/3 turn by hand after seal touches bracket. Do not overtighten.
- Fill the crankcase with oil to achieve reading at high mark of dipstick.
- Reconnect negative battery cable, start engine and check for oil leaks.
- Shut off engine, wait 15 minutes, then check oil level; add oil if required.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Oil drain plug torque 60-70 ft-lb (81-95 N•m)
Full service-parts list: Cummins/Onan DFBF →, Cummins/Onan DFCC →, Cummins/Onan DFCE →, Cummins/Onan DQBA →, Cummins/Onan DQBB →
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.