Detroit Diesel — Test Injection Nozzles
Testing & diagnosis
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- Keep hands away from the nozzle discharge. Fluid discharging from the nozzle under high pressure can penetrate the skin and cause infection.
Procedure
- Clean the top of the engine to prevent dirt from entering any openings.
- Detach high-pressure tubing and leak-off lines, covering their opening ends with plastic caps.
- Remove mounting (crab) bolt and clamp. Pull nozzle assembly from the cylinder head.
- Cover nozzle openings with protector caps and protect nozzle tip.
- Remove injection nozzle gasket from nozzle bore and discard.
- Test nozzles for spray condition, opening pressure and leakage on hand test pump J29075-150.
- Check nozzle opening pressure, tip leakage, discharge pattern and fuel leak-off.
Tools required
- hand test pump J29075-150 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- New or Rebuilt 3675 lb/in.2 ±75 lb/in.2
- Minimum Permissible (Used) 2900 lb/in.2
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.