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Discussion Starter · #1 ·
Further to my recent threads on this subject concerning my 156 1.9 JTD, and thinking that the problem was solved, it has shredded the belt again. This time though, I definitely heard a small knocking noise from the auxiliary belt area, then a short break and it knocked again 4 times.
When I opened the bonnet, I could see that the auxiliary belt had jumped on to the lip of the alternator pulley, even though the belt was perfectly aligned on every other pulley. As a result of riding on the lip of the alternator pulley, it has started to shred again. The previous evening after I had last used the car, because of the problems I have been having, I checked the belt and it was perfectly lined up on every pulley.
Has anybody experienced this symptom before? I am beginning to suspect the adjustable tensioner.
 

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As before, I suspect that the furthest tensioner looking from the top front is slightly out of line, perhaps 5%. This is not visible from the side when fitting the new belt. The bearing will be OK, but the tensioners collapse. Can't remember what you fitted last time.
Otherwise temporary seize in the A/C compressor?
 

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Discussion Starter · #3 ·
thanks keithglos - the A/C compressor is not the problem as this was a red herring last time, and I have not used it this week. The top pulley wheel was found to have the bolt sheared and the crankshaft pulley had not been installed correctly. This time (although the result is the same) it is slightly different. I guess the tensioner you are talking about is the spring-loaded one, which is the first pulley that the belt goes over after the crankshaft. As you look from the top of the engine it is the one nearest the bulkhead that is positioned in between the crankshaft and alternator. As far as I can see the belt driving order is: - Crankshaft - Spring-loaded tensioner - Alternator - Power Steering Pump - A/C Compressor - Top (Fixed) tensioner - crankshaft. Would that be correct?
 

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This sounds like an identical set up to my 2.0 TS engine.

I had a recent problem with the alternator siezing, but this was permanent, and causing the engine to barely turn over. Smoke came up from the engine compartment after only a few seconds, and when I remove the aux belt, it was slighly stuck around the alternator where it has presumable been dragged over and become hot. It as not out of line anywhere though. Replaced the alternator and jobs a good 'un.

You should be able to easily remove the auxiliary belt yourself if it is anything like the T.S.

1. Jack the car up drivers front wheel
2. Remove wheel
3. Remove plastic liners (2 on my car)
4. Use a long handled (or any cobbled together effort) 15mm ring spanner on the nut that is in the centre of the adjustable spring tensioner, and turn it anti clockwise. Takes a lot of force to get moving to start, but once moving, should be easier
5. with the tensioner fully to the left, slip the belt off


to get the belt back on, reverse the procedure, but I find it easier to get the belt over the last tensioner if it is the fixed one after the A/C compressor.


When the belt is off, all components should turn really easily by hand except the crank wheel. Not only should they turn, they should also be really smooth. If not, you may well have found your culprit. You can then replace the bit if it is stiff, or at the very least, remove it, disassemble, have a damn good look and possibly grease up.

Just pray it is not the alternator if you are going to attempt this yourself. It is a horrible job and well worth paying the £250 ish that a specialist Alfa garage will charge to replace.


Good luck :)
 

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Part number 55180011, gave me a lot of trouble on my 1910 Fiat JTD.
It was only replaced once, but was missed by 2 quite good service garages, and I had to insist that it was out of line. So did in 3 belts.
 
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