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        General >> Problems >> Engine Knock / Tap
        
(Message started by: martinctb on Mar 28^th, 2004, 4:25pm)

Title: Engine Knock / Tap
Post by martinctb on Mar 28^th, 2004, 4:25pm

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

Title: Re: Engine Knock / Tap
Post by allante on Mar 28^th, 2004, 10:07pm

injector?

Title: Re: Engine Knock / Tap
Post by Wayniac on Apr 14^th, 2004, 3:50pm

question for anyone readin who may know.....

is there 1 or 2 cats in the system ? not quite sure on the exhaust layout etc,

Title: Re: Engine Knock / Tap
Post by Steve_S on Apr 14^th, 2004, 10:41pm

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

Title: Re: Engine Knock / Tap
Post by Wayniac on Apr 15^th, 2004, 8:22am

cheers Steve.

I have the 2.9 24v. is there a quick fix to temp' cure this rattle?

Title: Re: Engine Knock / Tap
Post by Steve_S on Apr 15^th, 2004, 9:02am

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.

Title: Re: Engine Knock / Tap
Post by Wayniac on Apr 15^th, 2004, 4:09pm

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

Title: Re: Engine Knock / Tap
Post by Steve_S on Apr 15^th, 2004, 6:11pm

Try Cats Direct 'own brand range' http://www.cats-direct.com/ They list the 24v as under £220

Title: Re: Engine Knock / Tap
Post by Snoopy on Apr 16^th, 2004, 6:29am

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

Title: Re: Engine Knock / Tap
Post by martin_rowe on Apr 16^th, 2004, 7:37am

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.

Title: Re: Engine Knock / Tap
Post by Wayniac on Apr 16^th, 2004, 8:04am

cheers guys :D

£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.