Cummins/Onan — Removing cylinder head
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Distribute prying pressure equally so as not to damage the cylinder head
Procedure
- Remove the side and top panels of the engine housing.
- Drain the cooling system.
- Open the spark-plug shields and remove spark plugs and shields.
- Loosen the hose clamps on the upper radiator hose and remove the hose.
- Remove all accessories attached to the cylinder head.
- Remove the cylinder-head nuts and cap screws.
- Lift the cylinder head from the cylinder block, distributing any prying pressure equally.
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.