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Car Forum / Land Rover Cars / November 2007OTish - can use use dumdum for sealing exhausts and manifolds?
I'm having trouble getting the exhaust manifold on my car to seal properly. Can i use dumdum as an exhaust sealant? it says it will cope with up to 200 degrees on the tin. Or am i better off just using some silicone sealant? (I cant get or dont have the proper gaskets) I spent the morning welding up a crack in the exhaust downpipe and then refitted it (using exhaust jointing paste as i cant get the correct gaskets), only to find that the annoying noise was actually from a manifold-head joint or a crack in the manifold (so its coming off again tommorrow). Exhaust jointing paste is horrible stuff and i am sick of chipping the stuff off when i take things apart again so i wanted to use something else. I spent the afternoon refitting the 101 windscreen so have some dumdum about and was wondering if i could use up the tin on my exhaust? > I'm having trouble getting the exhaust manifold on my car to seal > properly. Can i use dumdum as an exhaust sealant? it says it will cope [quoted text clipped - 14 lines] > I spent the afternoon refitting the 101 windscreen so have some dumdum > about and was wondering if i could use up the tin on my exhaust? No. And most silicone sealant won't stand exhaust temperatures either. There is a good reason why that horrible stuff you refer to is still on the market - none of the possible 'nicer' alternatives will stand the conditions. JD > I spent the morning welding up a crack in the exhaust downpipe and then > refitted it (using exhaust jointing paste as i cant get the correct > gaskets), only to find that the annoying noise was actually from a > manifold-head joint or a crack in the manifold (so its coming off again > tommorrow). In my experience Firegum only works in conjunction with the correct gaskets - it doesn't stick well enough to work on its own, unless the seal is nearly perfect without it. High temperature silicone will work further down the exhaust, but can't cope with the heat at the manifold end.  Signature*A journey of a thousand sites begins with a single click * Dave Plowman dave@davenoise.co.uk London SW To e-mail, change noise into sound. Bastard thing. Have taken the manifolds off the engine. No signs of any blows at any joints. Reassembled with 2 gaskets after i scoured my stash of gasket sets (it has a heat shield between the head and manifold so you can fit a gasket either side) It still ticks. Tom Woods <tom@NOPSAMtomwoods.co.uk> uttered summat worrerz funny about: > Bastard thing. > [quoted text clipped - 4 lines] > gasket either side) > It still ticks. Spark plug? Head Gasket? Saab? :-) Lee D > Tom Woods <tom@NOPSAMtomwoods.co.uk> uttered summat worrerz funny about: >> Bastard thing. [quoted text clipped - 7 lines] > > Spark plug? they are all tight ad sparking and not very old. not taken them out to check further. > Head Gasket? Hmm. its all of 2000 miles old. might pull the plugs and do a compression test while im at it > Saab? yep >I'm having trouble getting the exhaust manifold on my car to seal >properly. Can i use dumdum as an exhaust sealant? it says it will cope [quoted text clipped - 14 lines] >I spent the afternoon refitting the 101 windscreen so have some dumdum >about and was wondering if i could use up the tin on my exhaust? what sort of seal? The turbo transit Di doesn't have manifold-to-head gaskets, it's sealed with sealer. Someone told me to use loctite. SignatureAustin Shackles. www.ddol-las.net my opinions are just that Travel The Galaxy! Meet Fascinating Life Forms... ------------------------------------------------\ >> http://www.schlockmercenary.com/ << \ ...and Kill them. a webcartoon by Howard Tayler; I like it, maybe you will too! well, looks like it isnt the exhaust manifold! compression test says ive got 150psi on 3 pots and zero on no 1. Its got a spark Oil and water are fine though and it doesnt seem to be pressurised so i'm guessing it could be a valve spring or valve and the noise is the cylinder contents going back into the inlet manifold or somthing?. Saab engines are definately built well - i've done about 50 miles today seemingly on 3 cylinders and it is only a little bit slower than it should be (though the idle leaves a lot to be desired!). Getting my best ever mpg too! ;) > well, looks like it isnt the exhaust manifold! > > compression test says ive got 150psi on 3 pots and zero on no 1. Its got > a spark Not having much luck with bloody engines are you Tom ! Steve >> well, looks like it isnt the exhaust manifold! >> [quoted text clipped - 4 lines] > > Steve The 101 engine is fine! Its just a shame its dashboard lights and swivel seals arnt as good (it looses everything out of the swivel in one day!). Gonna fix the dash lights tommorrow and stock up on ep90 and drive in style for a while (since im fixed at one work place for the next 4 days so dont have to worry about parking it) > The 101 engine is fine! Its just a shame its dashboard lights and swivel > seals arnt as good (it looses everything out of the swivel in one day!). Did you put new seals in ? > Gonna fix the dash lights tommorrow and stock up on ep90 and drive in > style for a while (since im fixed at one work place for the next 4 days > so dont have to worry about parking it) Fit a drip tray ! Steve >> The 101 engine is fine! Its just a shame its dashboard lights and >> swivel seals arnt as good (it looses everything out of the swivel in >> one day!). > Did you put new seals in ? not yet but i have em ready to do so. >> Gonna fix the dash lights tommorrow and stock up on ep90 and drive in >> style for a while (since im fixed at one work place for the next 4 days >> so dont have to worry about parking it) > Fit a drip tray ! im not worried about leaking in the work carpark ;) - its just bloody tricky squeezing a 101 ambi in there (and getting it out again!) unless you get there first thing! This isnt a problem when im at one site all day (as i am now for a while) but is when im doing 50+ miles going to 3 or 4 places. >The 101 engine is fine! Its just a shame its dashboard lights and swivel >seals arnt as good (it looses everything out of the swivel in one day!). can you use one-shot grease in the 101? Might stay in there a bit longer. Also, check yer swivel bearings, 'cos swivel leaks can be caused by slack swivel bearings, although you've probably done that. The biggest argument I've heard against one-shot is on vehicles with railko bushes on the top swivel. SignatureAustin Shackles. www.ddol-las.net my opinions are just that Travel The Galaxy! Meet Fascinating Life Forms... ------------------------------------------------\ >> http://www.schlockmercenary.com/ << \ ...and Kill them. a webcartoon by Howard Tayler; I like it, maybe you will too! >> The 101 engine is fine! Its just a shame its dashboard lights and swivel >> seals arnt as good (it looses everything out of the swivel in one day!). > > can you use one-shot grease in the 101? Might stay in there a bit longer. Yes, but you need one-and-a-half per swivel. Lizzy > > can you use one-shot grease in the 101? Might stay in there a bit longer. > > Yes, but you need one-and-a-half per swivel. > > Lizzy I'd rather use ep90 so i can see when it is leaking out! it just needs a new seal on, and perhaps a bit of chemical metal over the couple of pits on the swivel. |
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