diesel injector pressure

The old 617.XX fives have a1,958 to 2,074 psi opening pressure for new injectors, 1,740 PSI for used injectors. Your engine is may be similar.

The 603 engine is a little different -I think. My repair manual assumes the injectors never need changing. I'll talk to my fuel injection specialist on Monday.

Thanks

Chas Hurst

Why? All the Bosch diesel injectors that use a spring to regulate opening pressure wear out in time. The springs usually weaken and you have to either replace the springs or add shims to the springs. The nozzle in the injector can also develop leaks or asymetrical spray patterns. The nozzle is available a separate repair part. However, I would not attempt to rebuild the injectors unless you have a Bosch test stand or the like to test opening pressure of each injector. Rrebuilt injectors (Bosch rebuilds them) are not all that expensive and you should be able to install them yourself.

I recently replaced the injectors (with Bosch) in my car. I wasn't happy with the results, so I am contemplating testing the new injectors. I have the use of a Buda tester, but I have no intention of rebuilding injectors myself. If needed I'll send them off to H&R.

Chas Hurst