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        General >> Problems >> 2.9 24v hydraulic tappets - tapping
        
(Message started by: Tim_Lusername on Jan 7^th, 2010, 2:55pm)

Title: 2.9 24v hydraulic tappets - tapping
Post by Tim_Lusername on Jan 7^th, 2010, 2:55pm

Hi

Wonder if you can help me with this one.

My cosworth has recently started sounding very "tappety" if that's the right word!

It's probably way overdue an oil change, I bought it about 12 months ago and haven't got round to it yet, lose some points for that I guess.

I've done a search of the forum and read about the possibility of a loose spark plug so I'll check for that.

Any advice on oil and tappet interconnectedness would be welcome.

Have a good 2010 and thanks for all your help last year.

Tim

Title: Re: 2.9 24v hydraulic tappets - tapping
Post by Highlander on Jan 7^th, 2010, 4:21pm

Could it be the timing chain rattling?

Is it worse at start up then clears or is it there constantly?

Title: Re: 2.9 24v hydraulic tappets - tapping
Post by Tim_Lusername on Jan 7^th, 2010, 4:37pm

Highlander, thanks for the reply.

Sorry I probably should have mentioned that to rule it out.

There is a spot of timing chain rattle at start up but it goes quickly.

The "tappet" noise I'm hearing only appears when pressing on the accelerator. at idle it's hard to notice but as soon as the engine is revved it's there. Would be amazed if it turned out to be a spark plug loose as it sounds like a right bag of spanners when it starts.

Also it's a very regular noise which sounds revs related.

Title: Re: 2.9 24v hydraulic tappets - tapping
Post by Tons_of_fun on Jan 7^th, 2010, 8:30pm

A blowing exhaust manifold maybe ? ::)

Title: Re: 2.9 24v hydraulic tappets - tapping
Post by Tim_Lusername on Jan 7^th, 2010, 8:34pm

Thanks but I'm sure it's a metallic tapping noise rather than a gaseous "parping" :-o

Title: Re: 2.9 24v hydraulic tappets - tapping
Post by gozz on Jan 7^th, 2010, 8:41pm

Tim.
Tappet noise is a very light tinny sort of sound which is usually present on start up if the followers are getting worn,but lessens when they fill with oil.This time of year piston slap is prevalant,this is a deeper rattle which disappears as the pistons expand within a couple of minutes.
GOZZ.

Title: Re: 2.9 24v hydraulic tappets - tapping
Post by martin_rowe on Jan 8^th, 2010, 9:38am

cracked ex manifold or egr system, blocked oil strainer in sump reducing oil pressure, sludge build up in the oil feed to the head, broken cam bearing cap bolt, seen em all.

Title: Re: 2.9 24v hydraulic tappets - tapping
Post by Highlander on Jan 8^th, 2010, 11:14am

on 01/08/10 at 09:38:01, martin_rowe wrote:

blocked oil strainer in sump reducing oil pressure,

blocked by broken timing chain guides maybe?

Title: Re: 2.9 24v hydraulic tappets - tapping
Post by a900one on Jan 8^th, 2010, 3:46pm

What oil pressure should there be on a 24v bob engine?, I might test mine at some stage.

Title: Re: 2.9 24v hydraulic tappets - tapping
Post by ADroste on Jan 10^th, 2010, 3:24pm

Please, check the oil-level immediately!

Regards
Armin

Title: Re: 2.9 24v hydraulic tappets - tapping
Post by Tim_Lusername on Jan 12^th, 2010, 10:57am

Hi

Thanks for the advice.
I've checked the oil level and it's approx 75% up the stick between the two marks.

Title: Re: 2.9 24v hydraulic tappets - tapping
Post by Thunderchild on Jan 14^th, 2010, 12:24pm

My bet would be the one of cats starting to disintegrate. Sounds just like noisey tappets and does increase with revs. Put a screwdriver on the exhaust manifolds in turn and then stick the blunt end in your ear and you should hear the rattle.

HTH

Tc

Title: Re: 2.9 24v hydraulic tappets - tapping
Post by Tim_Lusername on Jan 14^th, 2010, 12:55pm

Thanks for the advice. When the risk of my ear freezing to the screwdriver has passed I'll give it a go :-p

A silly question but as the sound is coming from the engine bay - I've always assumed the cats are underneath the car , are they actually closer to the engine bay?

BTW I don't doubt your advice I work in architecture so I'm well aware of the crazy things that sound will do :-o

Title: Re: 2.9 24v hydraulic tappets - tapping
Post by Thunderchild on Jan 14^th, 2010, 1:17pm

The cats sit either side of the engine just below the exhaust manifold. I actually thought the big ends had gone on my old 24v when in fact it was the cat failing lol.

HTH

Tc