Volvo Penta — Injectors, checking/adjusting
Adjustments · Injector (23712, 23713)
From a Volvo Penta service manual covering: TAD530GE, TAD531GE, TAD532GE, TAD722GE, TAD730G, TAD732GE, TAD733GE, TD520GE, TD720GE, tAd731GE. Check it applies to your exact model before use.
Applies to: Volvo Penta TAD530GE, Volvo Penta TAD531GE, Volvo Penta TAD532GE, Volvo Penta TAD722GE, Volvo Penta TAD730G, Volvo Penta TAD732GE, Volvo Penta TAD733GE, Volvo Penta TD520GE, Volvo Penta TD720GE, Volvo Penta tAd731GE
Before you start
- Fuel pressure jet can penetrate deep into skin tissue and cause blood poisoning.
- Use only clean test oil meeting ISO 4113 or clean diesel.
Procedure
- Connect the injector to the nozzle tester.
- Check the opening pressure; control value in Technical data.
- Check leak-down: pressure may at most drop to 5 MPa / 5 sec.
- Hold 2 MPa below opening pressure for 10 s; no drips permitted.
- Take off the cap nut and remove all parts.
- Wash details in an ultrasonic cleaner or washing petrol/Vanolen.
- Inspect injector details using an injector microscope.
- Dip parts in oil before assembly.
- Set pressure by selecting an appropriate shim; thicker shim increases opening pressure.
- Tighten the cap nut to 40 ±5 Nm and recheck in the nozzle tester.
- Check seal and perform chatter characteristic / spray pattern test.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Injector cap nut: 40 ±5 Nm
- Leakage: max drop to 5 MPa (725 psi) / 5 sec
Source: Volvo Penta 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.