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Took serpentine belt off to replace, neither old nor new belt will go back on

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93SCMax
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Re: Took serpentine belt off to replace, neither old nor new belt will go back on

Post by 93SCMax »

Sorry you had such bad luck or experience.
I'm nothing but pleased. Never had a failure. I'd recommend them every time. Certainly cheaper than Volvo brand but I don't think Gates is OEM. Not likely a European manufacturer is buying USA when good European belts were available. Do your research before posting what is most likely. If you had Conti problems at < 100K miles then you already had problems with the Volvo belt (Conti was a replacement). My Volvo belt lasted 8 years and 90k miles. My 1st Conti belt lasted 8 years and 48k miles before the alternator pulley seized and took it out. I'm now on my 2nd Conti belt. My research showed that Conti was the right/cheaper belt to replace the original. Nothing but good results here in the South. To each his own. If we are sharing opinions for those with no experience, I think my experience is worth sharing. Your opinion is also worth noting but my experience has been much more positive.

Correction: Alternator pulley seized, not air conditioner pulley.
Last edited by 93SCMax on Thu May 16, 2019 7:29 am, edited 1 time in total.
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vtl
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Re: Took serpentine belt off to replace, neither old nor new belt will go back on

Post by vtl »

93SCMax wrote: Wed May 15, 2019 6:58 pmMy Volvo belt lasted 8 years and 90k miles. My 1st Conti belt lasted 8 years and 48k miles before the air conditioner pulley seized and took it out.
Yes, this is what I'm talking about. My donor chassis is at 247k now, runs with the original A/C compressor. Conti puts to much stress on the bearings. Quality is good, very durable, but the size is mismatch. Should be like 3-5 mm longer or a bit more flexible.
05 XC70 265k, 16 XC60 45k, 19 Tundra 5k
93SCMax
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Re: Took serpentine belt off to replace, neither old nor new belt will go back on

Post by 93SCMax »

I see, you feel the "shorter" Conti belt caused the air conditioning pulley failure. Understand.

When my alternator pulley failed at 138k, I researched what pulley brand to use as a replacement. To my amazement, all reverse clutch pulley manufacturers stated that the pulley should be replaced when the multi belt was replaced. I thought this was crazy, but it led me to believe that this special pulley wasn't designed to last too long. This is also why so many folks spend big bucks to replace their alternator when their pulley seizes.

I certainly don't think the Conti belt caused my pulley seizure, but I can agree that they are tight (shorter?) and harder to install, and could impact all pulleys. My opinion, if the belt is too tight then the tensioner isn't doing it's job.

For the price and quality, I'll buy another Conti belt when my current one shows signs of age.
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Re: Took serpentine belt off to replace, neither old nor new belt will go back on

Post by abscate »

I’ve never read that alternator pulleys are maintenance items , is there a source for this?
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Re: Took serpentine belt off to replace, neither old nor new belt will go back on

Post by vtl »

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93SCMax
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Re: Took serpentine belt off to replace, neither old nor new belt will go back on

Post by 93SCMax »

abscate wrote: Fri May 17, 2019 3:32 am I’ve never read that alternator pulleys are maintenance items , is there a source for this?
Found this when I was doing my research. Gates calls them ADP's (Alternator Decoupler Pulley's). INA/Schaeffler, who holds the patent/design rights, calls them OAP's (Overrun Alternator Pulley's). When I did this 2+ years ago, I also know that I read it on the INA website...but can only find a "recommendation" now. The more you search, the more you realize this is a replaceable part designed to be changed out. You will not find any recommendation from Volvo concerning periodic inspection or maintenance of this pulley. It's much cheaper to replace this than buy an alternator with this on it. You will need a special tool to remove it from your alternator.

He talks about replacing the pulley with each belt replacement, about 2:20 into the video. He repeats it again around 7:20.
https://video.search.yahoo.com/search/v ... ction=view

I purchased the INA 535 0072 100 and it's worked well for the last 2 1/2 years and 15k miles.
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Re: Took serpentine belt off to replace, neither old nor new belt will go back on

Post by cn90 »

On the alternator issues...

The VR is an electronic part, which can fail any time. But often around 150K-200K.

The Clutched Pulley (think bicycle rear hub allowing free-wheeling), anywhere between 140K-180K.

Bearings 180K.

Brushes 180K.

So if your pulley is bad at 140K, it is not a bad idea to get a new Bosch alternator to prevent being stranded.
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Re: Took serpentine belt off to replace, neither old nor new belt will go back on

Post by vtl »

Unfortunately, Bosch rebuilds come with sub-par bearings, I have read multiple people's complaints. Looking at the then new wife's XC60, Bosch also puts sub-par bearings into new alternators as well.

DIY rebuild with real quality parts is heading north, close to $200. I did mine about 2 years ago, it works reliably, unlike $100-200 rebuilds I tried to use before, and is still super-quiet. Yes, I opened my new quality bearings and topped them up Mobil Polyrex EM grease.

The correct bearings are really important: for alternator application they should be rated for high temperature and come with a low friction seals. I took me like 3 days to figure out what all these letters mean on old bearings and find the proper substitutes.
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Re: Took serpentine belt off to replace, neither old nor new belt will go back on

Post by cn90 »

I am not talking about rebuilt, I am talking about Brand-New Bosch alternator, which is about $280-$300 depending on the yr/model. This is money well spent.
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Re: Took serpentine belt off to replace, neither old nor new belt will go back on

Post by XC70Rider »

vtl wrote: Wed May 15, 2019 5:32 pm Yeah, for other cars... They are often OE to them. For Volvo 5 cylinder it is either shorter or is not flexing enough like Volvo OE (Gates?) does. This causes extra stress on power steering pump, and generally makes it much harder to install.
I installed both Contitech belts when doing the timing belt job and water pump 5 months ago. I recall pushing the tensioner to it's limit to get the serperntine belt over the PS pulley. To keep the pulley bearings from wearing I just ordered the Volvo Serpentine belt 30731808. It's only $10 more than the Contitech belt.
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