Detroit Diesel — Injector Unit Pump Installation
Installation
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- PERSONAL INJURY: wear a face shield or goggles; avoid sudden release of high-pressure hose connection.
Procedure
- Lubricate two new O-rings with a light coating of engine oil.
- Install the two new O-rings on the unit pump shaft using installer J-45373.
- Insert the pump into the mounting hole in the cylinder block and push until it seats, about 4 mm (0.16 inch).
- Install the mounting bolts and tighten to 65 N·m (48 lb·ft).
- Connect the engine wiring harness to the injector unit pump.
- Remove the engine cranking tool and replace the inspection cover; tighten bolts to 25 N·m (18 lb·ft).
- Connect the fuel line at the fuel gallery inlet and tighten to 50 N·m (37 lb·ft).
- Install the fuel lines and pressure limiting valve on the fuel gallery outlet; tighten all fasteners to 50 N·m (37 lb·ft).
- Install the fuel filter cap; inspect/replace the O-ring; tighten cap nut to 25 N·m (18 lb·ft).
- Install the high-pressure fuel injector line (refer to 2.3.2).
- Prime the fuel system (refer to 11.1.5).
- Start the engine, check for leaks and tighten connections as needed.
- Install the engine trim cover.
Tools required
- J-45373 unit pump O-ring installer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Mounting bolts: 65 N·m (48 lb·ft)
- Inspection cover bolts: 25 N·m (18 lb·ft)
- Fuel gallery inlet fitting: 50 N·m (37 lb·ft)
- Fuel line/pressure limiting valve fasteners: 50 N·m (37 lb·ft)
- Banjo bolt: 40-50 N·m (30-37 lb·ft)
- Filter cap nut: 25 N·m (18 lb·ft)
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.