Perkins — The Perkins 1204E industrial engines have the

A Perkins service procedure — check it applies to your exact model before use.

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Procedure

1. In-line four cylinder
2. Four stroke cycle
3. Turbocharged charge cooled

Source: manual:992774__24_1204e_e44t__4tta_mk_ml.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.