Skimming a exhaust manifold - How much to take off ?

[scoobykiller]

Got a old exhaust manifold, i want to skim the mani to block flange, how much should i take off ?

 

[H_D]

It only needs to be skimmed if its warped and if it has warped it depends on how much its warped by.
If your skimming it just to clean the face of it then it would be very minimal but the engineers should be able to tell what is best.

 

[scoobykiller]

Cheers dude, dont believe it has warped, just want to take a bit off to be sure before i fit it

 

[corofin12345]

easiest way to check is to put the flange up against a window to see it if its flat

 

[scoobykiller]

Haha never thot of that cheers corofin

 

[Skalabala]

Skim it until its clean/flat

 

[Rev]

I guess that check is horizontal part as verticlly old glass is thicker at the bottom due to it being a liquid rather than solid.
Good trick though as steel rulers are not always straight , I find a steel ruler used for cutting will curve in the middle.
It may seem obvious to some but would go very gently and supporting the manifold weight underneath , ie not pressing hard on the glass as it could be very dangerous having both your hands drop onto glass shards if the glass breaks.

 

[corofin12345]

^^ i didnt say put it through the window :haha: