Re: [DML] Re: Rusty Exhaust Manifold Studs

[Martin Gutkowski <webmaster@xxxxxxxxxxxxxx>]

The original studs, and the new studs we get from Volvo are identical at 
both ends, although one stud must be longer to mount the starter 
heatshield to.

We also recommend the manifolds be faced before refitting, in fact we 
keep a pair on the shelf ready to change out on a customer's car.

Gaskets should not rust as there's no iron in them.

I've heard too much about NOT using stainless in aluminium to risk 
trying it, personally.

Martin

David Teitelbaum wrote:

>I forgot to mention that in most exhaust applications I also see the
>stud is "special" in that the end that goes into the head (the
>casting) is usually a course or "standard" thread and the part
>sticking out that holds the exhaust manifold on is a fine thread as
>are the nuts. This seems to be the best combination as fine threads
>don't have as much strength in a casting but you can get more torque
>on a fine thread and if they loosen you don't lose as much clamping
>force as on a course thread. In general you don't remove the studs
>unless you are machining the heads or you break a stud. The best
>exhaust manifold gaskets I see are the metal embossed type, they seem
>to hold up the best but eventually they rust, rot.
>David Teitelbaum
>vin 10757
>  
>





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