Cummins/Onan 5MDKAU — Adjusting Valve Lash
Adjustments · valve train
For the Cummins/Onan 5MDKAU, from the Cummins/Onan service manual.
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Before you start
- Do not use the fuel injection timing marks when adjusting valve lash
- See engine Workshop Manual 981-0533
Procedure
- Rotate the engine clockwise until the intake valve push rod just stops moving down.
- Turn the engine one half turn more.
- Adjust lash for both intake and exhaust valves.
- Adjust valve lash to 0.0059 - 0.0073 inch (0.145 - 0.185 mm).
- Repeat the procedure for the other cylinder.
Specs & values
- Valve lash 0.0059 - 0.0073 inch (0.145 - 0.185 mm)
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.