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Re: Diesel Injectors
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Posted by jdemaris on March 14, 2007 at 13:36:14 from (66.218.11.20):
In Reply to: Diesel Injectors posted by Formerly PaMike on March 14, 2007 at 10:04:31:
There's a big difference when checking an injector - between "new performance" and "still working - but not for long." With many diesels, they will sound fine until the injectors are just about completely worn out. So, you cannot assume - that injectors pulled from a good running engine are okay. On the other hand, I've tested injectors with a lot of use and they tested almost like new. Personally, I don't trust anyone anymore unless I know them - when it comes to testing. I worked in a diesel shop for most of my life - but not anymore. Last two sets of injectors I sent out - all tested bad. One set - from my IH B-275 tractor - I gave instructions to check and call me first if bad. They came back, C.O.D. with an over $200 bill for four injectors - that got four new nozzles installed. After that, I bought a new tester and now do them all myself again. You can buy a new tester for $100 - sometimes less. In the long run, it can save you a lot of money. In general, injectors are suppossed to "settle" over time - and the pressure is supposed to drop. Pressure test specs are different for new or used - and you are NOT supposed to shim or adjust old injectors to "new" pressure. Also, over time the seats get hammered. Once that happens, no cleaning with make them "like new" again. But, sometimes, you can clean them up, lap a bit, and extend the life of them. With pencil-injectors - that is pretty-much all you can do. With bigger injectors - especially pintle-type, it's usually best just to change the nozzles with new. I just bought 8 new nozzles - right from Bosch for my GM diesel and they were $5.50 each.
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