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Topic: Engine Knock / Tap (Read 749 times) |
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martinctb
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I love YaBB 1G - SP1!
Posts: 41
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Engine Knock / Tap
« on: Mar 28th, 2004, 4:25pm » |
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Can i pick your brains just started my 1995 cozy to try and id a knock / Tap Load on my Cosworth engine, start her up and noise seems to be coming from he rear of the engine got under neath with my tube and listened around the sump but although i still could hear the knock it wasn't via the tube. So spanner in hand i stripped the air intake system off the top and removed the right hand rocker cover fully expecting to see a broken valve spring or damaged cam but nothing, any ideas. The knock/tap is like its when a certain cylinder is in action. Also i looked as best as i could at the crown of the piston seemed fine. Martin
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allante
Full Member
1996 24v Scorpio Saloon
 
Posts: 289
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Re: Engine Knock / Tap
« Reply #1 on: Mar 28th, 2004, 10:07pm » |
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injector?
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"Hell hath no fury like a Cosworth scorned!"
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Wayniac
Newbie
'97 2.9 24v. It aint turbo.... But its enough !
Posts: 6
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Re: Engine Knock / Tap
« Reply #2 on: Apr 14th, 2004, 3:50pm » |
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question for anyone readin who may know.....
is there 1 or 2 cats in the system ? not quite sure on the exhaust layout etc,
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Steve_S
Full Member
1997 scorpio ultima 2.9 24v lpg
Posts: 655
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Re: Engine Knock / Tap
« Reply #3 on: Apr 14th, 2004, 10:41pm » |
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The cats can rattle like hell when failing, mine has been doing it for months, sounds like a timing chain rattle. So any rattles from the rear of engine, check the cats first
24v has 2 cats, other models have 1, not sure about the 2.9 12v
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Steve S
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Wayniac
Newbie
'97 2.9 24v. It aint turbo.... But its enough !
Posts: 6
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Re: Engine Knock / Tap
« Reply #4 on: Apr 15th, 2004, 8:22am » |
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cheers Steve.
I have the 2.9 24v. is there a quick fix to temp' cure this rattle?
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Steve_S
Full Member
1997 scorpio ultima 2.9 24v lpg
Posts: 655
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Re: Engine Knock / Tap
« Reply #5 on: Apr 15th, 2004, 9:02am » |
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If its the cat you will need to replace it. The exhaust section from the cat will need to be removed and checked for pieces blocking the pipe. The only temporary fix would be to knock the plates out of the cat and refit, however this would put your emmissions over the legal limit, also with the work involved you need to concider whether its even worth concidering this. The best option would be to replace it.
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Steve S
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Wayniac
Newbie
'97 2.9 24v. It aint turbo.... But its enough !
Posts: 6
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Re: Engine Knock / Tap
« Reply #6 on: Apr 15th, 2004, 4:09pm » |
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Cat prices !!! 
£305 each ! surely there must be some where cheaper ?
any pro's and con's RE: a custom exhaust system made and fitted ?
any original exhaust bits to be kept ? best method really if any one knows ?
cheers
Wayne
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Steve_S
Full Member
1997 scorpio ultima 2.9 24v lpg
Posts: 655
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Re: Engine Knock / Tap
« Reply #7 on: Apr 15th, 2004, 6:11pm » |
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Try Cats Direct 'own brand range' http://www.cats-direct.com/ They list the 24v as under £220
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Steve S
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Snoopy
Administrator
Very old.BAD tempered and missing friends.
Posts: 6278
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Re: Engine Knock / Tap
« Reply #8 on: Apr 16th, 2004, 6:29am » |
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You could also try Chester exhaust supplies I have heard that they have a very good service and reputation... http://www.cesuk.com/
Cheers
Snoopy
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martin_rowe
Full Member
I love YaBB 1G - SP1!
Posts: 879
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Re: Engine Knock / Tap
« Reply #9 on: Apr 16th, 2004, 7:37am » |
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Re: Engine Knock / Tap
A couple of years ago I came accros a 24v with an unusual engine knock, It wasn't the cats as they make a very chaicteristic noise, it sounded as though it was coming from the rear of the engine, I eventually traced it to a broken camshaft brearing cap bolt !. Cats usually rattle, very often you can check by getting underneath the car and hitting the front pipe with your hand close to the cat, you will usually here the brick rattle easy as there is no other noise. just a thought.
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Wayniac
Newbie
'97 2.9 24v. It aint turbo.... But its enough !
Posts: 6
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Re: Engine Knock / Tap
« Reply #10 on: Apr 16th, 2004, 8:04am » |
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cheers guys 
£220 sounds a lot better. still a lot for the size and it isnt going to do anything for me personally but its better than £305.
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