Re: Re: Re: Fuel Knock??!??
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Posted by Robert M on September 10, 1998 at 13:39:01:
In Reply to: Re: Re: Fuel Knock??!?? posted by HJR on September 10, 1998 at 07:26:54:
: : Fuel knock can be caused by an injector that
: : does not close properly. I have experienced
: : this with a Kubota diesel as well as Detroit
: : diesels. A stethescope might pinpoint which
: : one is causing the problem. Hope this helps.
: : : I have a Ford 3000 diesel. Here's what happens: After about half an hour of "heavy" working at full throttle, the engine starts knocking. If I shut it down for 30-40 seconds and re-start, it goes away. The engine doesn't seem too hot to the touch. Could it be running too cold? Could water in the fuel cause this? What else should I look for? (I have already replaced the injectors.) : What exactly is fuel knock anyway? Is it doing any damage?
An injector that leaks fuel into the combustion
chamber causes fuel knock. A tiny speck of
dirt prevents the injector from closing properly
and this gives that cylinder too much fuel, and
this is what causes the knock.
I believe it will cause premature wear on that
particular cylinder because too much fuel will wash down the cylinder walls and this leads to
more expense than replacing an injector.
The age of an injector has nothing to do with
whether it leaks or not, my neighbor had a little
3cyl Kubota with 150 hours on the clock when
one injector went bad and it sounded like the
engine was going to fly apart.
Robert M
down the cylinder walls and
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