Anyone know about exhaust manifold ? - Mercedes Benz SLK Forum

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#1 Old 03-27-2010
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Anyone know about exhaust manifold ?

I have a hole somewhere in my exhaust manifold or gasket and before I take it to the garage I was wondering if anyone knew about the repair process ?

The crack seals up a bit when the engine gets warm, so its noisy when I start but calms down until I put my foot down.

It all looks pretty rusty around the manifold, so it could be the gasket. Does anyone know if when you change an exhaust manifold gasket the engine block has to be machined ?

Can the manifold be separated from the exhaust and pulled out easily ? how much stuff in the engine bay has to be removed ?

Im thinking about going to an exhaust specialist to try n get a quick fix weld. opinions?

p.s. right hand drive, pre facelift, 230k
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#2 Old 03-27-2010
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You don't have to machine the block but you will have to remove some parts to get to it. The air box and some related parts, the oil seperator,the supercharger intake mainifold/supercharger, the heatshield which is a pain in the butt. Of course the supercharger belt also. In adition to a new exhaust gasket you wil need a supercharger mainifold gasket as well, the dealer may tell you to replace all the supercharger bolts as well but you don't have to if your careful.
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#3 Old 03-27-2010
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I am not saying it isn't the header gasket, but you might consider torqing all the header bolts to spec first and see if that tightens up the header and gets rid of the noise you notice. It is a no cost potential fix and less labor/cost than replacing the gasket.
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#4 Old 03-28-2010
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thanks guys thats really useful, im going to check the torque now and see whats up. Ive noticed that when i switch the engine off after warming up theres a ticking sound coming from the manifold area, i remember hearing that that might mean gasket ?
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#5 Old 03-28-2010
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Quote:
Originally Posted by beanie View Post
. . . Ive noticed that when i switch the engine off after warming up theres a ticking sound coming from the manifold area, i remember hearing that that might mean gasket ?
It's usual for modern, thin wall exhaust systems to 'tick' as they cool down. When the engine is turned off, there are no exhaust gases flowing, so it would be impossible to tell at that time if the gasket has gone or not.






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#6 Old 03-28-2010
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Quote:
Originally Posted by beanie View Post
I have a hole somewhere in my exhaust manifold or gasket and before I take it to the garage I was wondering if anyone knew about the repair process ?

The crack seals up a bit when the engine gets warm, so its noisy when I start but calms down until I put my foot down.

It all looks pretty rusty around the manifold, so it could be the gasket. Does anyone know if when you change an exhaust manifold gasket the engine block has to be machined ?

Can the manifold be separated from the exhaust and pulled out easily ? how much stuff in the engine bay has to be removed ?

Im thinking about going to an exhaust specialist to try n get a quick fix weld. opinions?

p.s. right hand drive, pre facelift, 230k
Hi, i had exactly the same fault with my 230 pre facelift.
The manifold had cracked almost all the way through.
With the manifold removed it was easy to mig weld up after careful cleaning.
If you are a reasonable mech will take you a couple of hours to remove, not too difficult, hardest bit is getting the supercharger manifold off
A new manifold is Ł450 ish!, for the price (Ł10) of a gasket its worth getting your hands dirty
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#7 Old 03-29-2010
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Joy..............

Hi, good news, its the other side of the manifold, (I might have overreacted) the connection to exhaust. The ring part is f***kd, which by mercedes standards still requires manifold access. I have managed to find a dude in a custom shop thatll sort it out way cheaper plus with the $$ i save im gonna get some more custom work.... .

@ santamonica, I attempted to check the torque on the gasket, but the heatsink was way to hard to get off, its okay up until that last bolt right near the windscreen end, I did check the torque of some of the other bolts and found the bolts on top of the engine block worryingly loose, but its all sorted now...
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