Cummins/Onan — Change Turbocharger Oil Filter
Maintenance
From a Cummins/Onan service manual covering: V12 Series, V6-140, V6-200, V6-VAL, V6-VIM, V8-185, V8-265, V8-350, V8-VALE, V8-VINE, VT12, VT8-430. Check it applies to your exact model before use.
Applies to: Cummins/Onan V12 Series
Before you start
- Do not attempt to use substitute elements; element threads and filter paper are of special design.
- Make sure oil supply line to filter is connected at opening marked 'IN'. Reversing connections will lead to turbocharger failure.
Parts for this job
Part numbers from the service-parts list for Cummins/Onan V12 Series. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Unscrew element and discard.
- Clean filter head with solvent not harmful to aluminum.
- Inspect head for cracks and distorted threads; discard if damaged.
- Coat gasket atop new element with clean lubricating oil and fill element.
- Install element to head; tighten until gasket contacts head.
- Rotate element an additional one-half turn to seal gasket.
- Reconnect oil supply and discharge lines.
Specs & values
- Change at each oil change or when pressure drop is 15 psi or more
Full service-parts list: Cummins/Onan V12 Series →
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.