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MR997
Newbie


Joined: 05 Mar 2018
Posts: 23



PostPosted: Tue Apr 09, 2019 11:29 am    Post subject: Auxilliary belt tensioner Reply with quote

Is it possible for the belt tensioner to make a low rumble/knocking sound? It has been suggested that may be a possible issue and i'd rather be preventative than fix a problem after its happened. it is difficult to tell if the sound is speed dependent as the engine noise drowns the sound out if the revs are increased. Are there any simple tests?
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6761
Location: Brighton


PostPosted: Tue Apr 09, 2019 7:22 pm    Post subject: Reply with quote

I think i covered this in the PM you sent but for anyone else ..

Not really , alternator makes a deep rumbling ..at least on the 996 it does but as these get older .. the tensioner suffers from seizing and as such needs to be checked by someone that knows about this fault .

Copy paste my reply here if you wish .

This car is a gen 2 btw and is different from a gen 1 .
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MR997
Newbie


Joined: 05 Mar 2018
Posts: 23



PostPosted: Tue Apr 09, 2019 9:53 pm    Post subject: Reply with quote

DeMort, thank you.

Copied and pasted for the benefit of others:

Rumble .. first off .. the Gen 2 tensioners have a problem .. not all garages are aware of it .. the tensioner has a pivot .. it seizes .. it will end up causing damage.

Air box out .. 30 mm spanner and move the tensioner down .. the Torx bolt should not move and the tensioner should spring back .. the pivot is the disc under the torx bolt .

Ok .. noise .. take the drive belt off and check each pulley . spin by hand if nothing obvious then start the car .. is the noise still there .. if it is then its not a pulley .

Rumble .. it tends to be the alternator if its a deep tone but that's cars in general .. you will soon see when you do the above .

i've not had a tensioner make a noise .. i've seen them snap though due to the above problem .. not so good if it damages the engine casing shall we say .
 
  
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