Cummins/Onan — Oil and Filter Change
Maintenance · engine lubrication system
From a Cummins/Onan operator's manual covering: KTA51, KTA52, KTA53, KTA54, KTT52. Check it applies to your exact model before use.
Applies to: Cummins/Onan DFLA, Cummins/Onan DFLB, Cummins/Onan DFLC, Cummins/Onan DFM, Cummins/Onan KTT52
Before you start
- Crankcase pressure can blow out hot oil and cause serious burns. Do NOT check oil while the generator set is operating.
- Do not operate the engine with the oil level below the low mark or above the high mark.
Procedure
- Start the generator set and allow engine to warm up to operating temperature, then shut off.
- Ensure Automatic Start switch is at OFF position and negative (-) battery cable is disconnected.
- Remove oil drain plug or open drain valve and collect engine oil in a suitable waste container.
- When crankcase is drained, replace drain plug or close drain valve and torque to 60-70 ft.-lb (81-95 N·m).
- Unscrew the oil filters and discard.
- Apply a light coat of oil to the gasket sealing surface of the new filters and fill filters with clean, new oil.
- Install filters and tighten 2/3 turn by hand after the seal touches the sealing surface of the bracket. Do not overtighten.
- Fill the crankcase with the amount of oil to achieve reading at high mark of dipstick.
- Reconnect the negative (-) starting battery cable, start the engine and check for oil leaks.
- Shut off the engine, wait 15 minutes, and then check the oil level. Add oil if required.
Specs & values
- Oil drain plug torque 60-70 ft.-lb (81-95 N·m)
- Filters tighten 2/3 turn by hand after seal touches
Full service-parts list: Cummins/Onan DFLB →, Cummins/Onan DFLC →, Cummins/Onan KTT52 →
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.