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Home›Repair guides›Cummins/Onan›Coolant Filter Service

Cummins/Onan — Coolant Filter Service

Maintenance

From a Cummins/Onan owner's manual covering: 450 DFW, 450 DM, 500 DM, 600 DFY, 750 DFZ. Check it applies to your exact model before use.

Applies to: Cummins/Onan 450 DFW, Cummins/Onan 450 DM, Cummins/Onan 500 DM, Cummins/Onan 600 DFY, Cummins/Onan 750 DFZ, Cummins/Onan VTA-28-GI engine, Cummins/Onan VT-28-G engine, Cummins/Onan VTA28-G2 engine, Cummins/Onan KTA-38-GI engine

Before you start

  • Do not use antifreeze with an anti-leak formula; the stop leak element can prevent or retard coolant flow through the filter.

Procedure

  1. Close the shutoff valve.
  2. Unscrew the coolant filter and discard.
  3. Apply a light coat of lubricating oil to the gasket surface.
  4. Install new filter and tighten by hand until seal just touches filter head.
  5. Tighten an additional one-half to three-fourths turn.
  6. Open the shutoff valve.

Source: Cummins/Onan owner'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.

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