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Author Topic: Ahu mtdi knock  (Read 84 times)

August 12, 2018, 07:36:22 pm

Meilleur

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Ahu mtdi knock
« on: August 12, 2018, 07:36:22 pm »
hellos

i have an ahu with a cummins pump 4bt 11mm head tdi.

he is timing at 1mm ip

he has a clacking noise when you give fuel!

what could be the cause?

Sorry I’m français!!



https://youtu.be/3hJ7esUsLZk



« Last Edit: August 12, 2018, 07:39:40 pm by Meilleur »



Reply #1August 12, 2018, 08:39:42 pm

libbydiesel

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Re: Ahu mtdi knock
« Reply #1 on: August 12, 2018, 08:39:42 pm »
Cummins 4BTA pumps had 12mm plunger/head assemblies.  Because of the larger plunger the fuel is delivered in a shorter injection event so the clatter is more pronounced.  When I listened to your engine, though, the steady louder lower frequency knock sounds like a bad injector. 
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Reply #2August 12, 2018, 08:51:54 pm

Meilleur

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Re: Ahu mtdi knock
« Reply #2 on: August 12, 2018, 08:51:54 pm »
https://youtu.be/PhnGbwfbBz4


thank you for your answer here is another video.


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Reply #3August 13, 2018, 11:46:57 am

libbydiesel

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Re: Ahu mtdi knock
« Reply #3 on: August 13, 2018, 11:46:57 am »
Wind noise makes it a bit hard to hear, but it sounds fine/normal to me in that video. 
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Reply #4August 13, 2018, 10:55:23 pm

ORCoaster

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Re: Ahu mtdi knock
« Reply #4 on: August 13, 2018, 10:55:23 pm »
Wind was a bit hard to filter out.  I wasn't sure that there was a knocking noise that was abnormal.  Maybe a listen with at solid rod from ear to injector will help find any that are louder than the others.  I use a breaker bar and that seems to work well enough. 

Timing of 1.0 mm?  Could a change one way or the other make a slight difference for you?

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