Engine Specific Info and Questions > mTDI Mechanical TDI Conversions

Ahu mtdi knock

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Meilleur:
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

libbydiesel:
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. 

Meilleur:
https://youtu.be/PhnGbwfbBz4


thank you for your answer here is another video.


Envoyé de mon iPhone en utilisant Tapatalk

libbydiesel:
Wind noise makes it a bit hard to hear, but it sounds fine/normal to me in that video. 

ORCoaster:
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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