Detroit Diesel — Protective Sleeve Removal
Repair & overhaul
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- HOT COOLANT: never remove the cooling system pressure cap while the engine is at operating temperature.
- Replace the O-ring whenever the protective sleeve is removed.
Procedure
- Drain the engine coolant into a clean container.
- Remove the injector nozzle (refer to 2.4.1).
- Insert the 4-toothed socket J-46186 into the protective sleeve, engaging the four openings.
- Loosen the sleeve with a ratchet turning counterclockwise until threads disengage from the cylinder head.
- Insert the rubber-ended socket of injector sleeve puller J-46381, expand it, and pull the sleeve out.
- Remove the O-ring from the cylinder head.
Tools required
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.