Detroit Diesel — Repairing the Unit Pump Solenoid

Repair & overhaul · Injector unit pump solenoid

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

Procedure

1. Identify the failed unit pump and remove it (refer to 2.1.1).
2. Wipe the pump clean and push O-ring installer J-45373 onto the unit pump.
3. Mark the position of the intermediate plate relative to the pump body; rest the pump on the stop plate.
4. Remove paint from screw heads, remove screws with special torx bit DDC P/N 9045890210/00, lift off the magnet, intermediate plate and model plate.
5. Remove the intermediate plate and model plate from the magnet and clean sealing surfaces.
6. Remove the two spacer seals and clean the intermediate plate.
7. Mark the cross piece and anchor plate in relation to the unit pump.
8. Clean sealing surfaces on the unit pump, cross piece, and anchor plate.
9. Remove the stop plate and place a new stop plate under the unit pump body.
10. Install new seals in the intermediate plate and coat with high-temperature grease.
11. Place the intermediate plate on the unit pump body with cutouts facing the cross piece.
12. Place the magnet on the intermediate plate and the model plate on the magnet.
13. Secure model plate, magnet, intermediate plate, unit pump and stop plate with new screws; hand tighten.
14. Tighten the screws in a crosswise pattern to 5 N·m (4 lb·ft) using torx bit DDC P/N 9045890210/00.
15. Install new O-rings on the unit pump and install the pump in the engine (refer to 2.1.3).

Source: Detroit Diesel 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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