Perkins — Fuel Injector - Test
Testing & diagnosis
From a Perkins service manual covering: 402D-05, 403D-07, 403D-11, 403D-15, 404D-22, 404D-22T, 404D-22TA. Check it applies to your exact model before use.
Applies to: Perkins 402D-05, Perkins 403D-07, Perkins 403D-11, Perkins 403D-15, Perkins 404D-22, Perkins 404D-22T, Perkins 404D-22TA
Before you start
- Do not tighten the nut for the fuel supply line on the high pressure fuel line more than the recommended torque.
Procedure
- Run the engine at low idle.
- Loosen the nut for the fuel supply line at each fuel injector.
- Listen for the low idle to decrease or become rough at each cylinder.
- If engine rpm does not decrease or the engine continues to run properly, the injector may be faulty.
- Remove the worn or damaged injector for additional testing.
Full service-parts list: Perkins 402D-05 →, Perkins 403D-07 →, Perkins 403D-11 →, Perkins 403D-15 →, Perkins 404D-22 →, Perkins 404D-22T →, Perkins 404D-22TA →
Source: Perkins 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.