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Author Topic: recuring screeching noise coming from engine  (Read 3925 times)

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megas

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recuring screeching noise coming from engine
« on: 29 December 2007, 16:51:04 »
just bought a damged cdx of ebay for spares for my cd. doesnt look to bad considering the 169.000 miles. only frontle damge and suspect cooling system is ruptered.
any ideas on the screeching noise?
megas
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TheBoy

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Re: recuring screeching noise coming from engine
« Reply #1 on: 29 December 2007, 16:55:57 »
Quote
just bought a damged cdx of ebay for spares for my cd. doesnt look to bad considering the 169.000 miles. only frontle damge and suspect cooling system is ruptered.
any ideas on the screeching noise?
megas
Try it without the aux belt on (if a v6, only briefly, as this drives water pump)...
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megas

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Re: recuring screeching noise coming from engine
« Reply #2 on: 29 December 2007, 17:00:45 »
sorry 2.0ltr, sounds as though its coming from the head,  head gasket? proper screechy like a fan belt but not.
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TheBoy

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Re: recuring screeching noise coming from engine
« Reply #3 on: 29 December 2007, 17:07:23 »
Remove aux belt.  failing that, check the cambelt tensioners and pulleys
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PaulyQ

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Re: recuring screeching noise coming from engine
« Reply #4 on: 12 January 2008, 13:39:40 »
Sorry to bump this thread but this is happening to my car. V6, 2.5L Auto.

I'm not a technically minded geeza so where is the Aux belt, if it's that is it best to also replace water pump or just the belt?

The belt seems spot on & fairly new with regards to the cambelts but looks can bee deceptive.
« Last Edit: 12 January 2008, 13:42:42 by PaulyQ »
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cbr6er

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Re: recuring screeching noise coming from engine
« Reply #5 on: 12 January 2008, 14:03:39 »
I had a similar problem, initially thought it was the aux belt but turned out to be the cam belt tensioners.  Annoying as they were 3 days old at the time, bad batch apparently.
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PaulyQ

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Re: recuring screeching noise coming from engine
« Reply #6 on: 12 January 2008, 14:24:27 »
Since my cambelt and tensioners are an unknown quantity to me(car may have done 100,000 but don't know when the belts where last done - can't assume they where done at 80,000) I am booking the car in next week to get them done, better safe than sorry.

EDIT:

Hmmm.....

Been reading back and I think it might just be the top left roller on the front of the engine block (which is also a tensioner apparently), cost around £25. Think I may just replace that on Monday and see if that cures the noise.

For my motor can I assume the part number is: 9157962

Just out of interest, if I was to tighten the belt (it "seems" tight enough), where would the best place for me to do this?

On Ramps.... yes I know that bit ;D

But where is the water pump located and what do I tighten?
« Last Edit: 12 January 2008, 15:48:11 by PaulyQ »
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Tony H

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Re: recuring screeching noise coming from engine
« Reply #7 on: 12 January 2008, 18:35:48 »
The pully your refering to is the tensioner which is the spring loaded self tensioning type. To release it put a socket and bar on the centre nut and turn clockwise this should move the pully. I found it easier to fit the belt over the alternator pully last, than the way the Haynes book of lies recommends which is fit belt on  tensioner pully last :y
The water pump is located in the centre of the block and can be identified by the pully which has a smooth running surface as opposed to grooved.
« Last Edit: 12 January 2008, 18:39:41 by Tony_H »
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PaulyQ

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Re: recuring screeching noise coming from engine
« Reply #8 on: 12 January 2008, 20:03:02 »
Cheers all :)
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PaulyQ

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Re: recuring screeching noise coming from engine
« Reply #9 on: 12 January 2008, 21:04:58 »
Will it be safe to drive my car around 5 miles to get to the garage as long as I don't hoof it?
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PaulyQ

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Re: recuring screeching noise coming from engine
« Reply #10 on: 14 January 2008, 00:18:25 »
1st question... above  :y

2nd question... if I get the top left roller can I also buy just the cambelt (without all the other gubbins in  a kit), may as well get that done at the same time as the tensioner pulley is off.
« Last Edit: 14 January 2008, 00:18:47 by PaulyQ »
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Kevin Wood

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Re: recuring screeching noise coming from engine
« Reply #11 on: 14 January 2008, 09:31:22 »
1) Assuming it is the aux. belt tensioner then it should be safe to limp 5 miles up the road. Make sure it's not a cam belt tensioner though!

2) Do you mean the cam belt or the aux belt?

There is quite a lot more work involved in changing the cam belt and this MUST include changing the tensioners as well as the belt since the tensioners actually fail first in most instances. It must be changed at 40k/4 year intervals so if you're close to that it may as well be done.

Regarding the aux belt, have a look at it. If it's staring the crack and looking tired then change it. If it's in reasonable condition it may as well be left as it is a very quick job to change.

Kevin
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Re: recuring screeching noise coming from engine
« Reply #12 on: 14 January 2008, 10:40:35 »
Quote
1) Assuming it is the aux. belt tensioner then it should be safe to limp 5 miles up the road. Make sure it's not a cam belt tensioner though!

2) Do you mean the cam belt or the aux belt?

There is quite a lot more work involved in changing the cam belt and this MUST include changing the tensioners as well as the belt since the tensioners actually fail first in most instances. It must be changed at 40k/4 year intervals so if you're close to that it may as well be done.

Regarding the aux belt, have a look at it. If it's staring the crack and looking tired then change it. If it's in reasonable condition it may as well be left as it is a very quick job to change.

Kevin

...and on a 2.0 ltr, changing the water pump is a must too...
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PaulyQ

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Re: recuring screeching noise coming from engine
« Reply #13 on: 15 January 2008, 15:11:59 »
Thanks for the answer chaps....

OK, got car booked in for next week to get the full cambelt/rollers/tensioners done  :y as I definately think it is the top left tension pulley that's screeching. Don't know whether to risk going to the garage in the car though as I can't afford to pay another £65 to transport it 4 miles up the road.

Good year so far.... auto gearbox and now this.... has topped nearly a grand to fix by the time this has been done and the wife isn't happy :(
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shyboy

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Re: recuring screeching noise coming from engine
« Reply #14 on: 15 January 2008, 20:37:44 »
As Kevin Wood suspects, you may be confusing the auxiliary and cambelt pulleys. The one on the outside is the auxiliary pulley and belt. The cambelt pulleys are not visible behind the front cover, which obviously has to be removed to gain access, but these and the cambelt are the most important job to be done within the 40k mileage intervals.
Not too serious if your auxiliary belt system fails. Easily fixed. Cambelt/pulley/tensioner failure is invariably catastrophic.
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