displaying posts 1 to 13 of 13

Author Subject: tap after cam belt change.
andy306gti

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Location: Ilkeston, Derbyshire.

Registered: 12 Jun 2008

Posts: 173

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Post #1
Hi all,

I know you've heard this a thousand times before lol. But please read on...

Anywhoo.. Had the car for just over 2.5 years (brought it off Carl) and after 30k exactly the water pump decided it'd had enough and started chucking water out. So In my infinite wisdom I made my first mistake and thought how hard can it be to change right? lol. so anyway I went to pug and brought a new water pump and cam belt kit (they sent me with a 137 belt and tensioner etc). I took the old pump and belt off which looked like ECP parts and put the new stuff on. Timed it up using the 3 dowels and loosened the 6 bolts, tensioned the belt. Tightened the 6 bolts up. Turned it over by hand like 20 times with the spark plugs out to check for interference, put the dowels back in to double check and they went in ok put it back together and started it up. DOH! It now has a tapping. I pondered whether it could've been there before and I was just paranoid as it did have a very slight tap up close but no its definitely louder than any noise before, sounds like its coming from the inlet side of the cam covers from cylinder 2.

Now I'm not that naive so I am reasonably sure I've probably tapped and bent a valve but I'm just wondering how? I've got a RichW solid pulley so I know its not the infamous pulley slip. The holes seemed to line up OK so can the timing really go far enough out just with the cam adjustment? or have I just done something catastrophically wrong? and how come its only 1 valve? surely the tolerances between the valve and the pistons are near as dammit the same on all cylinders?

I've got no one else to blame but myself on this unfortunately, lmao...

Any help Greatly appreciated!

Cheers
Andy
Posted 16th May 2010 at 20:43
andy306gti

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Location: Ilkeston, Derbyshire.

Registered: 12 Jun 2008

Posts: 173

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Post #2
Interestingly it drives and idles fine. It pulls like a train still(its supercharged though...) and definately hasn't lost any power.
Posted 16th May 2010 at 20:46
MCH_GTi6

formerly mch

Location: Hayle

Registered: 09 Sep 2005

Posts: 2,456

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Post #3
did you loosen the 2 cam pulleys and spin them fully clockwise before fitting the belt?

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Posted 16th May 2010 at 20:48
andy306gti

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Location: Ilkeston, Derbyshire.

Registered: 12 Jun 2008

Posts: 173

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Post #4
yes with mine there are 3 small bolts in each pulley in elongated grooves... others have just one single bolt on some sort of pivot mechanism.

Sorry. Should've made that more clear. These are the 6 bolts I speak of. Yes
Posted 16th May 2010 at 20:53
andy306gti

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Location: Ilkeston, Derbyshire.

Registered: 12 Jun 2008

Posts: 173

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Post #5
Just had a thought, I struggled a bit getting the belt over the final tensioner/waterpump. Should this be a tight fit? or should it go on quite easily.

cheers
Posted 19th May 2010 at 00:02
jeffers Forum Admin

Location: Leeds

Registered: 14 Dec 2003

Posts: 3,702

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Post #6
Mate i've just done exactly the same thing... i feel your pain! Sad

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Posted 19th May 2010 at 00:28
andy306gti

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Location: Ilkeston, Derbyshire.

Registered: 12 Jun 2008

Posts: 173

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Post #7
Doh! Did you find out what had caused it with yours?
Posted 19th May 2010 at 04:06
jeffers Forum Admin

Location: Leeds

Registered: 14 Dec 2003

Posts: 3,702

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Post #8
Well i had a problem with the verniers being stuck so i removed them one at a time and freed them up, The Crank i would like to add remained Pinned, just when i removed the exhaust cam vernier the cam moved into its most settled position bout 1/8th of a turn Forwards, when replaceng the vernier i could not rotate the cam backwards so had to continue a full revolution, i thought this would be okay as the pistons when the crank is pinned are all mid bore inline, however after a conversation with Pete Rallye yesterday he seems to think a valve could of just "Kissed" an open inlet vale on the way round thus causing a ever so slightly bent valve and the subsequent Tap!Sad

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Posted 19th May 2010 at 11:45
bigbadbowen

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Location: Winchester

Registered: 21 Nov 2003

Posts: 13,753

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Post #9
Doh !

hmmm again you could have a slipped crank pulley bud ?

Anyway jeffers thats a head off job (about time) and some spends thrown at it or - I think a nice new (more powerfull lump is needed)

Get in touch you know you want too

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Posted 19th May 2010 at 12:12
mechanical_repairs

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Location: leicester

Registered: 10 Jan 2005

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Post #10
Bugger, i feel your pain as you take as much care as possible and then this still happens, regards yours Andy the only thing i feel that could have happened with yours is the tension has been set to one side when adjusting the timing and pulling one of the cams adrift, or a cam sprocket has spun slightly when fiiting the new belt.

Its normally the valve kissing each other that causes the damage rather than a valve tapping the top of a piston.

Its a bugger but if you decide to takle it yourself removing the head etc, you will get the best buzz from it when you manage to get it all fixed, when the heads on the bench you will then be able to see how close they actually run. If you require any info or help just give us a call.

Carl

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Posted 19th May 2010 at 13:15
monty-69

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Location: Colne

Registered: 02 Jul 2006

Posts: 790

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Post #11
Sometimes a worn/clogged lifter can empty when turning the engine over by hand, especially 20 times. They usually fill up when oil is warm at fast idle. Maybe an oil flush could work Dunno
Posted 19th May 2010 at 17:50
andy306gti

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Location: Ilkeston, Derbyshire.

Registered: 12 Jun 2008

Posts: 173

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Post #12
Thanks for all the responses guys! much appreciated.

Carl, How much would you want to fix it up? I'm in 2 minds now whether to tackle it myself so I'm going to let my bank balance decide. lol

Cheers
Andy
Posted 19th May 2010 at 23:25
darkgti6

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Location: Bracknell

Registered: 07 Jun 2008

Posts: 1,361

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Post #13
mechanical_repairs wrote:
the only thing i feel that could have happened with yours is the tension has been set to one side when adjusting the timing and pulling one of the cams adrift


and im all to familiar with thisWhistle

so if the belt has been tensioned wrongly in this way how long would it be before you would know about it? After 20k perhaps?

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Posted 20th May 2010 at 02:47

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