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Discussion Starter #1
I have no idea if the pulley on my car was the original one or not but it failed in May 2017 and was replaced by my local garage (with a non genuine one they supplied) at 91500 miles.

Tonight that one failed, fortunately no damage to anything other than the pulley, lots of smoke! Mileage now stands at 110,800.

I think that's a little on the early side? Anyone disagree?

Cheers
Guy
 

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Well that's not filling me full of joy...I'm changing mine on Friday...the rubber of the original is drying out with faint cracking (nigh on 150,000 miles though so can't complain). Just hope the pattern replacement lasts a bit longer than the OPs! Def gonna keep the original as a spare though....just in case.
 

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My 70k mile original one showed signs of cracking, nothing to the point of failure though, would have likely gone on another few thousand miles without issue, was changed with all the belts, tensioners etc anyway.

I'd be interested to see who the supplier of your aftermarket part was, and if this failed in the typical manner.

The OEM is a Dayco job - (as I replaced mine with) and did have a thicker rubber part, plus the Hz ratings were slightly different.
 

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What brand was the one that was fitted?

Wonder if it is being 'caused' by something on the auxiliary side, something giving the belt much more drag. Is the belt normally completely quiet, or is there some noise especially on startup?
 

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Discussion Starter #6
What brand was the one that was fitted?

Wonder if it is being 'caused' by something on the auxiliary side, something giving the belt much more drag. Is the belt normally completely quiet, or is there some noise especially on startup?
I have no idea what make the failed one was, the garage is being reasonable about it. I'll be supplied a genuine Alfa one (from Shop4Parts) plus replacement belts. Courtesy car is being supplied FOC but I suspect that I'll still have to pay the labour costs. The belt is normally completely quiet, if there's something else that's caused the failure I'm sure they'll find it when they strip it down later this week but I'm not sure what else runs off that pulley? Presumable power steering, aircon pump, fuel pump? Hopefully it's not one of them seized causing slippage on the belt and that's what's burning. More news to follow, probably early next week.
Guy
 

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Most stuff just comes with a 1 year guarantee from the manufacturer so they are being very reasonable if they are sorting it under warranty.

Running directly off the crank pulley is A/C and power steering pump but the alternator is also ran indirectly with another belt off the A/C compressor.
 

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I had mine failed, caused by seized alternator pulley (free wheel). I was lucky that it failed at home when I was moving car on driveway to have alternator changed
 

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Discussion Starter #9
I had mine failed, caused by seized alternator pulley (free wheel). I was lucky that it failed at home when I was moving car on driveway to have alternator changed
I've got the car back this lunchtime and the pulley is wrecked, the outer part separated from the inner with melted rubber on the split line. So, now I'm a little concerned that I may have cured the symptom but not the underlying cause? What can fail on the alternator that causes the belt to stop and why would the crankshaft pulley give up the ghost before the belt? I'll try to post a pic of the damage later, fortunately it's just the pulley.

Guy
 

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Its a bit of a colvoluted routeing for the belt, there is a sprung tensioner, and idler wheel, either of which could sieze, then there's the bearings on the alternator and PAS pump, and the gubbins inside the AC compressor.

That said, the crank pulley is an inherent failure point, and you may have just got a duff one..
 

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Discussion Starter #11
Here's the failed pulley, there is a reference number on it that says "B 1511-92 BGA" if that helps anyone identify the manufacturer. Not sure it'll allow anyone to identify the cause but to me it just looks like the inner surface bond has failed allowing slippage/heat/smoke.
Guy
 

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Our 159 is on it fourth one - at least in our ownership.

The first went at about 80K in a cloud of smoke and a load of noise that sounded like the crank had exploded.

That lasted 6 months and 7k miles before failing again. Garage (very good specialist) fixed it FOC, could find nothing wrong with the rest of the drive train, also look like the rubber had simply failed.

That one lasted 40K and 2 years before starting to fail again, so I changed it. Current one is on about 5K and 6 months.

I’m starting to view these as consumables.
 

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Our 159 is on it fourth one - at least in our ownership.

The first went at about 80K in a cloud of smoke and a load of noise that sounded like the crank had exploded.

That lasted 6 months and 7k miles before failing again. Garage (very good specialist) fixed it FOC, could find nothing wrong with the rest of the drive train, also look like the rubber had simply failed.

That one lasted 40K and 2 years before starting to fail again, so I changed it. Current one is on about 5K and 6 months.

I’m starting to view these as consumables.
I bought a 2.4 once and the previous owner had welded the outer half to the inner half, problem solved :lol:
 

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Yeah, that would fix it. Wouldn’t do much for the NVH though.

I’ve changed an (apparently) good one on a V6 recently and the engine is much smoother.
 

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They're bad on all engines really, but the 159 2.4 JTDM does seem to have a bigger appetite from them than most engines. They barely ever go wrong at all on Twinsparks, V6s aren't too bad although they tend to deform when using a puller to pull them off the engine. Diesels are definitely the worst but for some reason the 159 is particularly bad. I think my 10v is still on its original at 230k.
 

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12 minutes!




LOL!:blabla:














.....well mine (2.0JTDm) has had slight cracking since I bought it in Jan 2018....may have been cracked a long while before that too I guess.
 

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Discussion Starter #19
Didn't look at mine before it failed so can't tell you! All I do know is that it was okay on the way into work that morning and gave up when I started it 8 hours later. Fortunately on startup rather than whilst doing 70. I can't tell you how long the previous one lasted, I only got the car at 70k miles with next to no history, changed it at 91K and it's gone again at 111k. Maybe I need to check it again at 132k? Hopefully an Alfa part will last a little longer?
Guy
 

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Looking through the service history on my 2.4 jtdm Spider , it was replaced at 88,000 miles with a good quality Dayco pulley ,but would avoid all the cheap crank turkish/chinese crank pulley's on e-bay , fitted a £40 pulley to my brothers Mondeo ST 2.2tdci it lasted 6,000 miles !! Then replaced with an aftermarket Gates pulley , twice the price and still fine after another 70,000 miles.
 
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