exaust trouble
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exaust trouble
i have a 85 f150 5.8l,my trouble is where the manifild connects to the downtube.i have a major leak there and fumes are horiable.any suggestions,i tried tightning the bolts but there really rusted,i know to heat them up but need some suggestions before i begin this headach...
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Joined: Nov 2007
Posts: 22,415
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From: Denver Metro Area, CO
I would imagine the donut gasket(s) is/are shot but IMO the only way to reliably determine
that is to take it apart. Soak the nuts with PB Blaster or Liquid Wrench for a day or two. If
you don't mind sacrificing your exhaust, it might be easier to cut the exhaust pipe
downstream a bit and remove the entire manifold + the remaininglittle piece from the engine
and work on it on a bench. You can later re-join the pipes, either via welding or get one of
those clamp-on union thingers for a couple bucks at the auto parts store.
-ct
that is to take it apart. Soak the nuts with PB Blaster or Liquid Wrench for a day or two. If
you don't mind sacrificing your exhaust, it might be easier to cut the exhaust pipe
downstream a bit and remove the entire manifold + the remaininglittle piece from the engine
and work on it on a bench. You can later re-join the pipes, either via welding or get one of
those clamp-on union thingers for a couple bucks at the auto parts store.
-ct
Post Fiend
Joined: Nov 2005
Posts: 7,437
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From: Charles Town, W bygod Va
what engine? r/l side? Whe its cold start it up and immediately (before the man gets hot) put your hand aroud the leak and try to determine exactly where its coming from. Plugging the tailpipe with a rag or having someone blip the throttle might help
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From: Virginia
i have a 85 f150 5.8l,my trouble is where the manifild connects to the downtube.i have a major leak there and fumes are horiable.any suggestions,i tried tightning the bolts but there really rusted,i know to heat them up but need some suggestions before i begin this headach...
Post Fiend
Joined: Nov 2005
Posts: 7,437
Likes: 4
From: Charles Town, W bygod Va
sorry just re-read... the left (drivers) side on my 86 f350 drw 2wd has a heat riser valve (hrv) between the exh man and the y-pipe. the top of the hrv is a gasaket (to ex man) below is a flange (no gaket, just metal to metal). if you have that setup You need to figure out exactly where the leak is & go from there
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exhaust trouble
thanks guys for such a fast response,far as the donut gasget i went to auto zone they said that year does not require one,so unless there is a seal in there has to be metal 2 metal right?.im going to tear it apart this weekend,so i'll no more then.putting pb on tonight to let is soak,and to reply to bashby.the exaust manifold is on my left side of the truck,engine is 5.8L,this has been a problem since i bought it last year for plowing snow,i'll know more this weekend and keep you guys posted,,,thanks alot :-)
