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Hey guys,

I was hearing a rattle, and I was told it was the cats..

Upong ordering new cats and replacing the units it appears to be the drivers side heat shield instead.

The bolt is still in place but I can see a crack coming out of the bolt area.. the welder put a little weld on it and it's less noisy but still all too apparent..

From reading online here it seems like an engine out job.. But obviously I don't see the point in spending a fortune just to replace a cracked heat shield.

Here are my questions

1. Can't I just have it welded more in place to remove the annoying rattling?

2. When the car is getting it's timing belt checkup is there a way to have this resolved?

I can't believe that the only option for the heat shield would be removing the entire engine?!

Edited by mamovaka
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I just had both of mine welded and they're now as good as new - cost me two hours labor so I know the engine didn't come out, but I was under the impression they took them off to weld (but I could be wrong). I'll ask my mechanic on Monday ....

Hey guys,

I was hearing a rattle, and I was told it was the cats..

Upong ordering new cats and replacing the units it appears to be the drivers side heat shield instead.

The bolt is still in place but I can see a crack coming out of the bolt area.. the welder put a little weld on it and it's less noisy but still all too apparent..

From reading online here it seems like an engine out job.. But obviously I don't see the point in spending a fortune just to replace a cracked heat shield.

Here are my questions

1. Can't I just have it welded more in place to remove the annoying rattling?

2. When the car is getting it's timing belt checkup is there a way to have this resolved?

I can't believe that the only option for the heat shield would be removing the entire engine?!

Paddle Faster, I hear Banjos!
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I just had both of mine welded and they're now as good as new - cost me two hours labor so I know the engine didn't come out, but I was under the impression they took them off to weld (but I could be wrong). I'll ask my mechanic on Monday ....

fmxa,

That is awesome I have a specialist(aka just a guys that handles a lot of exotics) looking at them on monday.. and I hope he can pull that off.. 2 hours of labor is fine by me if that bloody rattling can go.. So let me know the update on yours if not I will post my progress here..

Thanks man

Edited by mamovaka
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Obviously a common problem.....

I too was informed by my mechanic that a proper fix is an engine out job. However, I recently fitted a pair of high flow sports cats and the rattle is all but gone. Now, you might think that the rattle was actually the old cats but no, it was definately the heat shield as it is cracked, like others. So, what gives?

I was reading recently that the Lotus V8 created a wierd set of harmonic vibrations under certain conditions which caused various components to crack, including heat shields, cats, exhausts and even the clutch bell housing (causing a change from alloy to steel at one point). My heat shield rattle was at 2000rpm on warm up, before disappearing at idle (850rpm) and then again at 4200rpm under acceleration. Since fitting the sports cats both rattles have almost completely disappeared.

So, has the change in engine characteristics with the new high flow cats shifted the engine harmonics and stopped the cracked heat shield from vibrating? Any physicists out there care to comment?

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Okay - to remove the heat shields you need to remove the engine mounts and some ducting (while supporting the engine!) and you then have access to get them out. Yes, mine were removed and sent out to a machine shop for repair. Call Harry at 714-979-1020 or check his site out at http://vikingmotorsports.com/ if you have any questions.

Edited by fmxa
Paddle Faster, I hear Banjos!
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Okay - to remove the heat shields you need to remove the engine mounts and some ducting (while supporting the engine!) and you then have access to get them out. Yes, mine were removed and sent out to a machine shop for repair. Call Harry at 714-979-1020 or check his site out at http://vikingmotorsports.com/ if you have any questions.

And doing all of that is only a 2 hour job? this sounds very good..

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Yep 2 hours, but I guess it may vary on how difficult and long it takes to get to them out - Harry and his guys are the best around!

Paddle Faster, I hear Banjos!
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