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Post by Paulus17 on May 2, 2019 8:40:30 GMT
Well I finally got the aux belt changed on the Rav and noticed that the belt was made in two halves using two different materials and was surprised to see all the cracked surface on the top layer which is rubber yet the under layer which is some sort of webbed material was still ok with just some bits missing. The bloke who fitted it said the top layer will start to crack again soon but don't worry if it does as that's normal?? So it looks like the main strength is with the under layer material so what is the use of the rubber layer on top which cracks??    |
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Post by firemac on May 2, 2019 11:09:28 GMT
Interesting, Paul. It's obviously a robust piece of kit though - thankfully! 
How's the RAV going now?
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Post by Paulus17 on May 2, 2019 12:22:55 GMT
Interesting, Paul. It's obviously a robust piece of kit though - thankfully!
How's the RAV going now?
Yes it must be Jim but will we be told it needs changing at the next MOT, or an advisory if they see the cracking, if it cracks so soon? How often should they be changed? Rav is fine Jim, touch wood, but Mrs P still feels summats gonna happen every time she go's out in it,and also complaining that her left knee hurts when she has driven it so would prefer an Auto  How's yours coming along? |
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Post by firemac on May 2, 2019 12:28:03 GMT
Interesting, Paul. It's obviously a robust piece of kit though - thankfully!
How's the RAV going now?
Yes it must be Jim but will we be told it needs changing at the next MOT, or an advisory if they see the cracking, if it cracks so soon? How often should they be changed? Rav is fine Jim, touch wood, but Mrs P still feels summats gonna happen every time she go's out in it,and also complaining that her left knee hurts when she has driven it so would prefer an Auto How's yours coming along? According to the service schedule, it gets first inspection at 6 years/60K miles and then every year/10K miles thereafter. I'd replace every 6 years. The only failure I ever had was on our first RAV and it broke at 9 years.
Touch wood, so far, so good. :TU:
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Post by Paulus17 on May 2, 2019 12:34:10 GMT
Yes it must be Jim but will we be told it needs changing at the next MOT, or an advisory if they see the cracking, if it cracks so soon? How often should they be changed? Rav is fine Jim, touch wood, but Mrs P still feels summats gonna happen every time she go's out in it,and also complaining that her left knee hurts when she has driven it so would prefer an Auto How's yours coming along? According to the service schedule, it gets first inspection at 6 years/60K miles and then every year/10K miles thereafter. I'd replace every 6 years. The only failure I ever had was on our first RAV and it broke at 9 years.
Touch wood, so far, so good.  Cheers Jim :TU: should be ok for a while yet then  That's good to hear. I now prefer the Rav again as it's easier for me to get in and out of and is more comfy and use it when we both go out over the Yaris purely for those reasons :yes: |
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Post by firemac on May 2, 2019 12:40:19 GMT
According to the service schedule, it gets first inspection at 6 years/60K miles and then every year/10K miles thereafter. I'd replace every 6 years. The only failure I ever had was on our first RAV and it broke at 9 years.
Touch wood, so far, so good. Cheers Jim should be ok for a while yet then That's good to hear. I now prefer the Rav again as it's easier for me to get in and out of and is more comfy and use it when we both go out over the Yaris purely for those reasons Yes, The Boss likes ours for the same reasons but I prefer driving the Saab.......  |
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Post by Paulus17 on May 4, 2019 9:52:50 GMT
Cheers Jim should be ok for a while yet then That's good to hear. I now prefer the Rav again as it's easier for me to get in and out of and is more comfy and use it when we both go out over the Yaris purely for those reasons Yes, The Boss likes ours for the same reasons but I prefer driving the Saab.......  I had to drive my old gaffers Saab the once to go and look at a job we were doing at the time, and thought then this is nice but that was about 20 years ago when I was driving, can't remember which model it was though? |
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Post by philip42h on May 4, 2019 10:45:50 GMT
Well I finally got the aux belt changed on the Rav and noticed that the belt was made in two halves using two different materials and was surprised to see all the cracked surface on the top layer which is rubber yet the under layer which is some sort of webbed material was still ok with just some bits missing. The bloke who fitted it said the top layer will start to crack again soon but don't worry if it does as that's normal?? So it looks like the main strength is with the under layer material so what is the use of the rubber layer on top which cracks?? I'm no mechanic but as I understand, and as you say, the webbing material on the outside is there to provide the strength. The grooved rubber material on the inside is there to provide friction so that the belt grips against the similarly grooved pulley (or pulleys) on the engine. Obviously, or perhaps more precisely "not so obviously", the way the serpentine belt winds it way around the various pulleys it is not entirely clear which is the 'inside' and which is the 'outside' - the tensioner pulley, for example, is not grooved and bears against the 'outside' of the belt. |
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Post by Hoovie on May 4, 2019 13:58:11 GMT
Well I finally got the aux belt changed on the Rav and noticed that the belt was made in two halves using two different materials and was surprised to see all the cracked surface on the top layer which is rubber yet the under layer which is some sort of webbed material was still ok with just some bits missing. The bloke who fitted it said the top layer will start to crack again soon but don't worry if it does as that's normal?? So it looks like the main strength is with the under layer material so what is the use of the rubber layer on top which cracks?? I'm no mechanic but as I understand, and as you say, the webbing material on the outside is there to provide the strength. The grooved rubber material on the inside is there to provide friction so that the belt grips against the similarly grooved pulley (or pulleys) on the engine. Obviously, or perhaps more precisely "not so obviously", the way the serpentine belt winds it way around the various pulleys it is not entirely clear which is the 'inside' and which is the 'outside' - the tensioner pulley, for example, is not grooved and bears against the 'outside' of the belt. The grooved rubber section keeps the belt from gradually drifting and falling off as it fits into the grooved pulleys. The only strength in the belt is from the webbing. I don't think that is cracked either. I would say those cracks are serrations as it needs to curve in both directions and needs the flex there. BTW, If/when it does need changing, you can buy top brands such as Gates at surprisingly little money, so if the Toyota price seems too much, shop around. PS. I am surprised this belt would factor into a MOT test? MOTs are about safety - this belt is only applicable to the engine essentially - checking this as an MOT would be the same relavence as checking the oil level on the dipstick I would have thought. |
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Post by Paulus17 on May 4, 2019 14:58:57 GMT
Well I finally got the aux belt changed on the Rav and noticed that the belt was made in two halves using two different materials and was surprised to see all the cracked surface on the top layer which is rubber yet the under layer which is some sort of webbed material was still ok with just some bits missing. The bloke who fitted it said the top layer will start to crack again soon but don't worry if it does as that's normal?? So it looks like the main strength is with the under layer material so what is the use of the rubber layer on top which cracks?? I'm no mechanic but as I understand, and as you say, the webbing material on the outside is there to provide the strength. The grooved rubber material on the inside is there to provide friction so that the belt grips against the similarly grooved pulley (or pulleys) on the engine. Obviously, or perhaps more precisely "not so obviously", the way the serpentine belt winds it way around the various pulleys it is not entirely clear which is the 'inside' and which is the 'outside' - the tensioner pulley, for example, is not grooved and bears against the 'outside' of the belt. Yes I can see the rubber part been for grip but was told on the MOT that it needs replacing ASAP as the belt is badly cracked, yes Charlie this is the place on the hill  but have since been told by other people who are mechanically minded that the rubber part will crack as it dries out etc, which does look bad when looking down from above in the engine bay so would assume that it needs changing straight away, but looking at the material below that looks like it would keep going fro ever. So now I know it's been changed will keep an eye on it for as long as we keep it |
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Post by Paulus17 on May 4, 2019 15:10:17 GMT
I'm no mechanic but as I understand, and as you say, the webbing material on the outside is there to provide the strength. The grooved rubber material on the inside is there to provide friction so that the belt grips against the similarly grooved pulley (or pulleys) on the engine. Obviously, or perhaps more precisely "not so obviously", the way the serpentine belt winds it way around the various pulleys it is not entirely clear which is the 'inside' and which is the 'outside' - the tensioner pulley, for example, is not grooved and bears against the 'outside' of the belt. The grooved rubber section keeps the belt from gradually drifting and falling off as it fits into the grooved pulleys. The only strength in the belt is from the webbing. I don't think that is cracked either. I would say those cracks are serrations as it needs to curve in both directions and needs the flex there. BTW, If/when it does need changing, you can buy top brands such as Gates at surprisingly little money, so if the Toyota price seems too much, shop around. PS. I am surprised this belt would factor into a MOT test? MOTs are about safety - this belt is only applicable to the engine essentially - checking this as an MOT would be the same relavence as checking the oil level on the dipstick I would have thought. Thanks David. The belt has been changed as mentioned in my first post with a genuine one curtesy of Kingo and there were no serrations in the new belt so must come from wear and tear? It was pointed out at the MOT that it needs changing so must have been in the health check they do :TU: |
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Post by jasehutch on May 4, 2019 16:06:04 GMT
Surely it's been mentioned in the mot test as it drives amongst other things, the power steering pump.
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Post by Hoovie on May 6, 2019 9:04:05 GMT
Surely it's been mentioned in the mot test as it drives amongst other things, the power steering pump.
New or changed inspection
There are new or changed inspections for:
strengthening plates and fastening
exhaust fumes entering cabin failure, which has been extended to all vehicles
inspection of drive shafts, which has been extended to all transmission shafts - including prop shafts
drive belts and chains
body condition, which now includes unsafe modifications, component security, including undertrays as well as body pillars on goods vehicles |
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Post by philip42h on May 6, 2019 12:02:05 GMT
Surely it's been mentioned in the mot test as it drives amongst other things, the power steering pump.
New or changed inspection
There are new or changed inspections for:
strengthening plates and fastening
exhaust fumes entering cabin failure, which has been extended to all vehicles
inspection of drive shafts, which has been extended to all transmission shafts - including prop shafts
drive belts and chains
body condition, which now includes unsafe modifications, component security, including undertrays as well as body pillars on goods vehiclesIf you go on the look at the MoT Inspection Manual itself the change relates to Section 6.1.7 Transmission ... A transmission: - joint, belt or chain excessively worn = Major
- so worn it is likely to fail = Dangerous
So, a mostly rhetorical question, is the serpentine belt part of the transmission system? I'd have thought not ... but there again I'm not a trained MoT tester ...
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