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Old 16-06-2012, 17:56   #1
pompeyrich
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Rattle from alternator drive belt at low revs

My 99 Club 2.0 diesel has started making a horrible rattling type noise from the alternator drive belt area. The noise is only there up to about 1250 revs then seems to settle down, any load on the electrics, A/C, lights on etc. makes the noise worse. Just had a look and either the drive belt or one of the pulleys seems to move across when the engine is revved and the noise stops when this movement has occured. Hope that makes sense, all seems ok, charging, running ok just sounds scary at tick over/ low revs.

Thanks for any help in pin pointing the problem, Rich.
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Old 16-06-2012, 18:01   #2
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my first port of call would be the belt tensioner. but you need to get it sorted asap as you don`t want the belt to come and cause futher problems if theres movement in the belt.
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Old 16-06-2012, 18:19   #3
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could be the damper pulley as well....
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Old 16-06-2012, 18:36   #4
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From below, try spraying the crank pulley with water when the engine's running. if the noise fades, you need a new pulley. That's where my money is.

TC
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Old 16-06-2012, 19:02   #5
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Quote:
Originally Posted by T-Cut View Post
From below, try spraying the crank pulley with water when the engine's running. if the noise fades, you need a new pulley. That's where my money is.

TC
never heard of doing that, but great tip and one i will remember to do if needs be
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Old 16-06-2012, 19:11   #6
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never heard of doing that, but great tip and one i will remember to do if needs be
Rich it does needs be. I'm with French Mike and TC : likely your crank pulley, or the bearings in one of the other pulleys, is failing. Ignore it and it could fail completely, causing further damage.

Mike

Last edited by Mike Noc; 16-06-2012 at 19:16.
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Old 16-06-2012, 20:16   #7
pompeyrich
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Thanks guys, what sort of further damage are we talking, major probs or just stuck in the middle of nowhere with a broken belt?

Really busy at work next week, 60 mile return trip and covering for my workmates, both on their hols, means little time for a trip to the garage. I know it's a piece of string question but could it make it through the week?
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Old 16-06-2012, 20:37   #8
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Like ya say "piece o string " thing .. ya takes ya chances n ya lives with the conciquences or you get it checked out .. have ya thought of getting a mobile fitter to ya workplace ??
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Old 16-06-2012, 20:59   #9
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Yes I know, bit of a small town I work in, not sure you can get a pizza delivered there yet, never mind a mobile mechanic! Will try and have a look tomorrow and take it from there. Is the crank pulley an expensive/time consuming job?
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Old 17-06-2012, 02:27   #10
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Exclamation Crank Puller/Tensioner

Yes, the pulley is expensive from Xpart. A member yesterday got his from Euro Car Parts, about half the price, I think.
Not an easy job & I think needs to be done from under car. Biggest problem, evidently, is loosening the pulley bolt. Need right size STRONG socket (one member said 1st socket broke, had to use an impact socket (as in air gun & some say this is easy way to loosen).......... with a '15 foot lever' ! !
I assume if left, pulley can disintigrate.
Far as I know it is advisable to also fit new tensioner.
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Old 17-06-2012, 15:03   #11
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Thanks again everyone, does seem quite a bit of money for a couple of pulleys. Any decent independant mechanics known in the Portsmouth area, thinking of using Sewards at Havant but they are certainly not the cheapest. Thanks again for all the help and suggestions, will update on progress/costs etc. Cheers, Rich
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Old 17-06-2012, 15:27   #12
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If it was me I wouldn't bother replacing the tensioner unless it is faulty. You don't hear of many going and I know one that has done well over 300k, and felt as good as new the last time the belt was off and it was spun.

Worth checking all the pulleys with the belt off including any play in the water pump pulley. How many miles has your car done?

Mike
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Old 17-06-2012, 15:44   #13
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If it was me I wouldn't bother replacing the tensioner unless it is faulty. You don't hear of many going and I know one that has done well over 300k, and felt as good as new the last time the belt was off and it was spun.

Worth checking all the pulleys with the belt off including any play in the water pump pulley. How many miles has your car done?

Mike
Just coming up to 120K. Been spoiled up until now, it's been superb, apart from the clutch just after I bought it at about 40K, replaced the original battery last winter and starter motor brushes around the same time.
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Old 17-06-2012, 15:54   #14
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BMW side :

http://bmwfans.info/parts/catalog/E4...ration_damper/

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Old 18-06-2012, 10:11   #15
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I'd just do the pulley, that's what the noise will be. My tensioner is original on nearly 200k and is perfectly smooth.

Aftermarket pulleys have been known to fail - go for OEM if you can afford it.

The reason they're expensive is because it's a lot more than just a pulley, it's also a damper system to kill any resonation in the crankshaft which could cause a crankshaft failure. If you have a look at one when you have it in your hand, it's a pretty clever bit of kit really.
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Old 18-06-2012, 11:58   #16
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Buy a Land Rover pulley, same part, but much cheaper.
Example: http://www.brit-car.co.uk/product.php?xProd=100530

To undo the bolt properly, there is a special tool to lock the pulley. Maybe hireable?





New bolts are now on offer at Rimmer: http://www.rimmerbros.co.uk/Item--i-GRID001733

TC
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Old 18-06-2012, 16:31   #17
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Quick update, drove to work and back, all ok, took car to Sewards at Havant, ex Rover dealer and Xpart stockist, they have confirmed it is the crank pulley, have ordered one and going to fit it on Thursday.

They have quoted me 400 based on a 3 hour job, they reckon there is no book time for the job and have based this estimated time from previous, albeit limited, experience, so could be more or maybe less.

Thanks again for your input so far and preparing me for the worst, would never have guessed 200 for a pulley!!
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Old 18-06-2012, 20:48   #18
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T/cut you might want to change the dimensions to 22mm a/f socket required.
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Old 18-06-2012, 20:57   #19
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400 - nonsense price!
Just got mine done last week in my local garage- 50 for labour (1 hours worth) and I supplied the parts: 120 for a Corteco crank pulley and 30 for 2 new belts. Total = 200.
Its an easy job for a garage up on a ramp with an air wrench.
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Old 19-06-2012, 04:02   #20
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Interesting looking at the parts & prices.
Can you believe 57 Euros for a Woodruff key, that's unreal
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