Perkins — To check the engine timing mark (Lucas/Delphi DPA and DPS)

Adjustments · Engine timing case / fuel injection pump gear

From a Perkins service manual — check it applies to your exact model before use.

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Procedure

1. Set the piston of number 1 cylinder to TDC on the compression stroke, see Operation 8-1 or Operation 8-2.
2. Remove the fuel injection pump and its joint, see Operation 11-31.
3. Align the key in adaptor 21825512 (A) with the keyway in the fuel injection pump gear and fit the adaptor.
4. Ensure the adaptor is against the rear face of the timing case and secure it to the gear with the nut supplied.
5. Loosen the screw (B4) on timing tool 21825610; set it to the correct engine check angle and tighten.
6. Loosen the screw (B5) and fit the splined shaft (B3); loosen screw (B2) and fit the 90° pointer 21825514 (B1).
7. Fit the splined shaft of the timing tool to the adaptor; slide the timing tool against the adaptor and tighten screw (B5).
8. Loosen the lock screw (B2); slide the pointer until its flat face is against the rear face of the timing case and tighten.
9. If the mark on the timing case is not correct, eliminate the mark and make a new mark along the pointer top straight edge.
10. Remove the timing tool and the adaptor.
11. Fit the fuel injection pump and a new joint, see Operation 11-32.
12. Remove the dial gauge from number 1 cylinder inlet valve and fit the valve springs and rocker lever.
13. Set the valve tip clearance of number 1 cylinder inlet valve to 0,20 mm; fit the rocker cover, see Operation 3-2.
14. Eliminate air from the fuel system, see Operation 11-35.

Source: Perkins 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.

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