i've got my 3 piece 200 tdi defender exhaust manifold off the engine at present (turbo woes ). i've taken the 3 pieces apart, when i put it back on engine should i use jointing compound where they slip together or just let them corrode up to seal?

Tonk just put abit of RTV Silicone on the faces and it will be fine.


Chris

RTV on exhaust? u sure? i was thinkin more like exhaust jointing paste, i'm sure there was nothing on there from last time

Sorry Tonk didnt read your post,a little bit of grease on the cast iron stuff and RTV on the tube work NEVER had a problem!!!!!!!!!!!! Just make sure the faces are clean.

I think silicone might be affected by extremes of heat. For exhaust joints that have a reasonably good joint anyway I use FireGum - it's like a thick toothpaste and comes in a similar type of tube. Perfect for what you describe m8.


Les.

Just read your 2nd reply Chris. I didn't know silicone could take that kind of heat.


Les.

Read my above post,RTV on the system isnt even breaking sweat at those sort of temps.The manifold would be fine without anything on IF the faces are good.

It's cr@p for cleaning your teeth though!!!

i'm talking about where the 3 parts slip in together, not on the mating face to the head. i too didn't know the rtv would stand upto those sort of temps

I'm with Les, I would just put a smear of exhaust assembly paste around the tubular slide in sections. Due to age, there may have been be some rust/carbon doing some of the sealing, which is now no longer there since you have taken it apart. If you put it together without assembly paste, it may take a while to 'seal'.

Regards,
Diff

I used high temp RTV to seal the problematic exhaust on my old 2 stroke bike, worked a treat.

Same as Les, that is what I did it sealed no problems

No mention of splitting/refitting the exhaust manifold into it's 3 parts in the workshop manual, I'd use the exhaust paste to seal the joints.

when mine was rebuilt it had been chemically cleaned and the three parts were loose.
exhaust paste (thin smear) sorted it

cheers, thats wot i'll go for then

second vote for RTV, both sides of the turbo and everything downwind of it - no worries

hmmmm maybe rtv one side and exhaust compund other for a test?

sounds like a plan - the Wurth stuff sticks like pooh to a blanket if that helps Tonk?

http://www.focussport.com/wurth.htm
shows RTV max temp 500f that isn't enough for an Exhaust manifold IMHO

they're exhaust paste rated to 1292°F, big difference

Tony the exhaust gas is always hotter than the manifold!!!!!!!!!!!!!! Put a temp gun on a manifold then look at EGT mega different!!!!!!!!!!!!!!!!!!!!!!!!!!

We are not talking about a high revving,forced inducation petrol engine here it is a derv burner!!!!!!!!!!!!!!!!!!!

RTV is holding mine together well enough, has done for ages - even the local lads at powerflow use it for the boyracers zorsts and the holdens they make manifolds for so cant be too bad, use whatever you feel is best for you though, its just another option

I understand that the gas is far hotter but why just not use Exhaust paste?

personally I find that RTV doesnt crack after the pipe has had a bit of an incident with an immovable thing, I also like the fact RTV has a million other uses and is nice and easy to work - I dont know about anyone else but exhaust putty always seems to prefer me to the thing Im trying to get it to stick to

putty/paste will and does break down after time,plus the smell is GREAAAAAAAAAAAAAAT.