Re: LT31 1986 DW jerking at 2000-2300 rpm


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Geschrieben von Frank aus MTK am 01. April 2021 18:33:33:

Als Antwort auf: Re: LT31 1986 DW jerking at 2000-2300 rpm geschrieben von emilio da roma am 18. März 2021 06:58:52:

Hi Emilio,

it looks like you are working in your motor actually, did you find the reason for the noise now ?

Frank


Emilio,
If you can't visually see the defect, you can loose the generator and if exists also the Servo Pump belt.
After this you should bei able to feel if the outer Part which drives the both belts is loose.
Ciao
Frank
Grazie Frank!


Hi Emilio

I am pretty sure Tiemo catched it.
After i read this below I remembered the noise and behaviour in the Videos. Now I remenber why I thought I did hear this noise somewhere before.
I had the same 20 years ago as my Vibration Absorber of my ACL was broken.
The Rubber inside which should keep the inner and outer Part together lost his connection to the metal parts.
You never should try to hold or fix the outer part for fixing or unfixing the central screw which needs 440nm Torque. You need the tooling which connects to the inner part. Perhaps someone did not use the correct tooling in the past while changing the drive belt and now the absorber is broken.
Frank
Hello Tiemo, Frank.
It sounds plausible. Is there actually a way to state for sure if the absorber is broken? The new part is ridiculously expensive at vw classic.
Thank you!
Ciao
emilio

Hello Emilio,
if the enginge itself shakes, regardless to the gears, the problem might be the cooling fan, viscoclutch, or the vibration absorber with the v-belts the cooling fan is mounted on. There might be an unbalance, perhaps due to aged polymer in the absorber. You can try grabbing the fan at one of its blades (but not break it!) and move it forth and back. If there is visible clearance, this should be examinated closer.
Annother possibility might be a bad injector that reduces power of one cylinder, so the engine is not running smoothly. This would not occur driving downhill with throttle lift-off.
Ciao,
Tiemo



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