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.
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