Detroit Diesel — Check Pressure Holding and Test for Leaks
Testing & diagnosis · Fuel injector
From a Detroit Diesel service manual — check it applies to your exact model before use.
Procedure
- Clamp injector in Tester J 23010-A and purge air from system.
- Close thru-flow valve without overtightening.
- Move lever 2 to rear horizontal position.
- Operate pump lever until gage slowly reaches 100-200 psi; check injector nut seal ring leaks.
- Move lever 2 to close both bushing parts; increase pressure to 1500-2000 psi; check filter cap gaskets and body plugs.
- Bring pressure to 500 psi; note time for pressure drop from 450 psi to 250 psi; should not be less than 7 seconds.
Tools required
- Tester J 23010-A Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 100-200 psi
- 1500-2000 psi
- 450 to 250 psi in not less than 7 seconds
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.