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Still curious about how my belt simply snapped. I did find a piece of debris wrapped around my compressor.
However, I'm still looking for another answer and happen to notice something:
When they changed the tensioner pulley, they also changed the idler pulley and serpentine belt.
I inspected and it appears that my belt is already showing signs of wear after only about 2 weeks.
The idler pulley doesn't seem wide enough to hold the belt, without the belt rubbing along the edge of the belt.
The idler pulley is slightly out of the picture, but you can see the belt starting to fray.
What do you think?
Look at the edge of the belt..
Looks like it's rubbing the edge.
Last edited by Anthony8858; Mar 22, 2017 at 05:12 PM.
For starters that's not normal. Unless the belt was supplied that way and installed, I'd say you have a pulley somewhere that has some damage to it, or the idler or tensioner is not installed correctly. The tensioner has to alignment tabs on the face that mates with the front of the timing cover. I have seen where the tensioner gets installed and tightened down, and appears to be tightened down, but isn't seated properly.
I would take the belt off, inspect all the pulleys to make sure there are no sharp edges where the belt makes contact. Make sure the tensioner is installed correctly. Definitely get another belt.
For starters that's not normal. Unless the belt was supplied that way and installed, I'd say you have a pulley somewhere that has some damage to it, or the idler or tensioner is not installed correctly. The tensioner has to alignment tabs on the face that mates with the front of the timing cover. I have seen where the tensioner gets installed and tightened down, and appears to be tightened down, but isn't seated properly.
I would take the belt off, inspect all the pulleys to make sure there are no sharp edges where the belt makes contact. Make sure the tensioner is installed correctly. Definitely get another belt.
+1
Odd that the've replaced the idler with a flanged plastic pulley, too. Jaguar superseded that part with one without (C2C22758), although I guess that there may be still some of the orginals around.
I'd be happier with something like this:
I changed the pulleys and serpentine on mine recently. The belt had not ragged anything like that in (at least) 12 years service.
edit: Q: Does that idler pulley have a flange at the back? Can't quite see for sure.
Mike
Last edited by michaelh; Mar 22, 2017 at 06:27 PM.
Reason: Add Q
Odd that the've replaced the idler with a flanged plastic pulley, too. Jaguar superseded that part with one without (C2C22758), although I guess that there may be still some of the orginals around.
I'd be happier with something like this:
I changed the pulleys and serpentine on mine recently. The belt had not ragged anything like that in (at least) 12 years service.
edit: Q: Does that idler pulley have a flange at the back? Can't quite see for sure.
Mike
I believe the flanged one was put on in error, and the cause of what I'm seeing.
My part search shows the flanged as an option in most parts stores.
Which one is the right one for my car?
I have an appointment to address this tomorrow morning and want to know what I'm talking about.
The part number is C2C22758, although the flanged pulley isn't necessarily the problem, unless it's the wrong part and the offset is different to the original. It's also simply held on by a bolt, so not much opportunity to get the fitting wrong.
The one I replaced was similar to that in your picture and hadn't caused any belt damage despite the bearing not being in the best of health.
Whether it would have caused the belt to snap, I don't know. But something ain't right.
Mike
Last edited by michaelh; Mar 22, 2017 at 07:05 PM.
If you look closely at the pic of the flanged pulley, you can see that theres a gap towards the rear and the belt is touching the outer flange.
When the car is running, I can see the belt rubbing on that flange
Funny thing.... when they changed the tensioner and idler, they did NOT change the belt because they said it was as good as new.
That tells me the problem is in the parts they installed. Either the tensioner or the idler.
Agreed.
When something new happens, always review previous actions.
The belt I replaced also looked good; I just replaced it because of its age. It hangs in the garage as a spare, although it would be better kept in the trunk...
As it's the front of the belt that is getting damaged, it's trying to ride too far forward somewhere. Taking account of the direction the belt travels, the tensioner is immediately behind the idler.
I'm not sure if you have replaced the tensioner complete, or just the pulley (incidentally, that's the same now as the idler). If the whole unit, I'd suspect that it's either not be seated properly, or out of true.
Just looked again, and if I had to guess, I'd say that the idler pulley needs a washer or spacer on the rear. It seems to be offset.
Ever other pulley has the belt riding center except that idler.
Well Anthony, I just told you of a pulley that works perfectly for nearly a year and an half on the same car (year/model).
I took the time to go out and verify this last night.
Maybe you're thinking this one too hard?
John
Yes John, I understand... That pulley has worked for you on your car... It is also the one on my car.
Michael, and an internet search are showing me the smooth pulley for my car as well.
Also from Jagrepair.com this basic diagram is showing me the smooth pulley.
I'm only looking for the answer to why some smooth, and some flanged?
Just to put another spin on this, is your ribbed belt simply in the wrong groove on the alternator pulley? It is hard to tell from the picture, but is the belt too far "forward" on the alternator pulley, should it be one groove back? Would it even fit? If it was to fit, I would assume it would bring the belt further back on the idler as well, and would avoid any of this edge destruction.
Also, if you take a look at the belt, are the ribs symmetric? In other words, is the belt flipped, or inside/out?
Hi Anthony,
When our cars were made, Jaguar fitted a plastic idler pulley, with either one or both flanges (I'm now not certain which; I didn't take too much notice of the one I removed.
At some point, there was a revision and it was given a new part #. It was still plastic.
At a later date still, there was a further revision to the idler. It lost its flange(s) and was made of metal rather than plastic. That part has not since been further revised, and is the one I quoted previously. A Jaguar dealer would supply that part as a replacement irrespective of what was already fitted.
It would not be wrong to fit a new plastic pulley if one was available. John has successfully done so, but he doesn't have a question mark over alignment.
Personally, I prefer the latest metal, flangeless version. I have seen what happens when the plastic type self destructs and it's not pretty. Search DaveInVA's post on that in the OEM replacements sticky.
So, in summary, the early versions of the idler were flanged and plastic, whereas the latest version is metal and without flanges.
Use the proper Jaguar part C2C22758 if you wish, although you will pay handsomely at the dealer. The Dayco and Gates are equivalent and can be bought for considerably less.
Whichever route you choose, you need to keep an eye on the belt until you are satisfied that the chafing problem has been rectified.
Mike
Last edited by michaelh; Mar 24, 2017 at 11:39 AM.
Reason: Best to get the OP's name correct..
Thanks for clarifying.
As we speak, I'm having a new flangeless pulley installed along with a new belt.
I'll keep a watchful eye on the wear of the belt for any signs of fraying .
The mechanic working on the car is confident that we solved this problem.
I guess we'll know soon enough
Take a look at this Is this the WRONG pulley?
