Detroit Diesel — Inspect Injector Parts
Testing & diagnosis · Fuel injector parts
From a Detroit Diesel service manual — check it applies to your exact model before use.
Procedure
- Measure follower top-to-slot dimension; must be 1.647 plus or minus .002 in.
- Inspect follower spring for wear and damage; check tension with spring tester J 29196.
- Inspect injector body threads, bushing seating surface and filter cap gasket sealing surfaces.
- Inspect filter caps, rack, gear and gear retainer.
- Check plunger and bushing assembly for scoring, corrosion or varnish.
- Check check valve, valve spring, spring seat, spring cage, spray tip and needle valve.
- Measure minimum thickness of used parts per Table 1.
- Measure needle valve lift with tool J 9462-02; must be .008 to .018 in.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 1.647 plus or minus .002 in follower
- .008 to .018 in needle valve lift
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.