300tdi idle speed adjustment - Defender Source
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  #1  
Old July 4th, 2011, 01:10 AM
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Carl Jonsson
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300tdi idle speed adjustment

I followed the workshop manual instructions to adjust the idle speed but I'm not sure I'm adjusting the right screw. I have a sneaky suspicion that I just adjusted the upper throttle limit which is not good. Since the wrong adjustment can lead to engine failure, can someone confirm I have the right screw? It's the long threaded rod with a stop nut and a slotted end. The stop nut had a black plastic cap that I had to break to remove. I'm starting to wonder this cap was there to stop amateurs like me from messing with it? Google was of no help.
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  #2  
Old July 4th, 2011, 09:40 AM
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Neill Thornton
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You talking about the back of the injector pump? That is most likely the max load fuel amount screw, the one that turning just a quarter of a turn increases power and black smoke.

See this diagram, it might be helpful:

http://dodgeram.org/tech/dsl/more_po...djustments.jpg
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Old July 4th, 2011, 10:04 AM
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Carl Jonsson
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Not the smoke screw. I adjusted what is called "idle speed screw" in that diagram you sent. I just don't see how that controls the lower limit. Shouldn't I be lengthening the throttle cable instead?
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Old July 4th, 2011, 11:28 AM
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Neill Thornton
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Don't know to be honest, my idle has always been good so I haven't messed with it.
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Old July 4th, 2011, 11:33 AM
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John B.
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Perhaps you should download and read the factory workshop manual.....

Section 19, page 2. There is a clear picture.
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Old July 4th, 2011, 12:03 PM
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The maximum rpm limiter is internal to the injection pump (IP) and can not be adjusted, so you can't over rpm the engine by way of giving the engine too much fuel via the IP. Internal to the IP is a weighted device that is regulated by by the speed of centrifugal force or speed. It is most commonly known as a governor.

(Side note, it would be possible to over "rev" the engine going down hill, with the drive train determining the the engines rpm's). That destructive top rpm speed would probably be well over 5,000.

Work the pump arm with your hand, as to mimic the pull of the throttle cable, and observe which "screw" the arm rests on when it returns to stop. This will be the idle adjustment setting "screw". The idle should be set to about 750 rpm's.
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Old July 4th, 2011, 04:49 PM
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Carl Jonsson
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Thanks for the helpful suggestion. I have it. That's what I was looking at. The picture nor description makes it clear that there are two adjustment screws; one on either side of the pump. One for upper idle stop and the one underneath, that you can't see, for the lower stop. So I figured it out and now have it set to 720.



Quote:
Originally Posted by Red90
Perhaps you should download and read the factory workshop manual.....

Section 19, page 2. There is a clear picture.
------ Follow up post added July 4th, 2011 04:03 PM ------

That's the kind of helpful advice I was looking for. Thanks Dennis. Since the manual didn't make it clear I ended up adjusting the upper limit screw.

Quote:
Originally Posted by Dennis
Work the pump arm with your hand, as to mimic the pull of the throttle cable, and observe which "screw" the arm rests on when it returns to stop. This will be the idle adjustment setting "screw". The idle should be set to about 750 rpm's.
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