Cummins/Onan A052J727 — Changing Engine Oil and Filter
Maintenance · Lubrication system
For the Cummins/Onan A052J727, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan MDKD
Before you start
- Hot engine oil can cause severe burns.
- Used oil can cause cancer or reproductive toxicity.
Parts for this job
- 185-2123 Oil filter Amazon eBay FridayParts $20.19
Part numbers from the service-parts list for Cummins/Onan MDKD. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Run the set under load to operating temperature, then stop it.
- Disconnect the negative battery cable.
- Remove oil fill plug and open the drain valve.
- Drain used oil into a suitable container.
- Close the oil drain valve.
- Remove the old oil filter with a filter wrench.
- Lubricate the new gasket and partly fill the new filter.
- Spin on by hand and tighten 3/4 turn after gasket contact.
Tools required
- Filter wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Tighten filter 3/4 of a turn after gasket touches mounting pad
- Drain valve has 3/8 NPT outlet
Full service-parts list: Cummins/Onan MDKD →
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.