Posted by jdemaris on October 21, 2014 at 05:35:06 from (70.194.11.149):
In Reply to: diesel fuel injectors posted by don656 on October 20, 2014 at 18:29:28:
You'd have to define what "last' means. I've pulled Stanadyne pencil injectors out of Deere engines with over 10,000 hours on them and they still worked. Poor spray pattern though. They'd test as "bad" if the usual test protocol was used. Also had to replace a few that plugged with less then 1000 hours. Note - not worn out - just plugged shut. I just pulled the injectors out of my 1994 IDI Ford truck as "routine maintenance." It has 278,000 miles on it and was running perfect when I pulled them out. I tested them and they checked near as good as the new ones. But as I said - "routine maintenance." New fuel injector nozzle tips cost $7 each. Near as cheap as spark plugs in a gas engine. So I replaced them. With pencil injectors - usually a cylinder goes dead when they plug since they rely on small orifices that plug. There is NO rebuilt process that I know of for pencil injectors. A few on this forum will claim there is (like Lavoy). Maybe so. I've never come across one that is cost effective. No good way to recut and narrow the valve and seat. Clean up and reset if not too worn -yes. I don't call that "rebuilt." In regard to pintle injectors? The ones I've dealt with just degrade over time and when really bad, cause engine knocking at cold starts. Since they can be fitted with brand new nozzle tips cheap - it makes no sense to me to try to clean up old nozzles. That is - unless you cannot get new ones anymore. I've had to lap and reuse many a Bendix injector in older Deere engines when new ones were not available.
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