Detroit Diesel — Fuel Injector Nozzle Removal
Repair & overhaul
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- NOTICE: Pull the nozzle straight out; do not twist or use pliers.
- FIRE: keep all potential ignition sources away from diesel fuel.
Procedure
- Remove the engine trim covers.
- Remove the cylinder head cover for each cylinder head as required (refer to 1.1.1).
- Remove the charge-air manifold (refer to 6.1.1).
- Remove the injector line (refer to 2.3.1).
- Remove the thrust bolt and the transfer tube; discard the old O-ring.
- Remove the tensioning arm.
- Attach injector unit pump puller J-46375 and adaptor J-46384; thread adaptor onto the internal M8 threading in the nozzle head and attach the impact extractor.
- Using the impact extractor, remove the nozzle from the cylinder head; discard the O-ring and heat isolator.
- Remove the impact extractor and adaptor from the nozzle.
- Remove the O-ring and heat isolator from the nozzle holder and discard; remove stuck heat isolator with puller J-46933.
- Cap off or cover the openings on the unit pump and nozzle to prevent contamination.
Tools required
- J-46375 injector unit pump puller / impact extractor Amazon
- J-46384 adaptor/puller Amazon
- J-46933 heat isolator puller Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.