 Exhaust Leak, Again (still leaks) |
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| warrenoliver |
 May 27 2009, 07:57 PM
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Member  Group: Members Posts: 363 Joined: 11-November 06 From: McFarland, Wisconsin Member No.: 7,199 Region Association: Upper MidWest  |
I have a 73, 2.0, with FI that has a persistent backfire on deceleration only after the engine has warmed up (IMG:style_emoticons/default/headbang.gif) . I suspected an exhaust leak so I took off both heat exchangers. Both showed leaks at the head/exhaust gasket. I took both gaskets out, cleaned the head where the gasket seats and even tried filing the ends of the heat exchangers themselves so they are flat.
I reinstalled, and it still leaks (IMG:style_emoticons/default/chair.gif) (IMG:style_emoticons/default/chair.gif) I then got new gaskets and new 12mm nuts from Pelican (these are the copper colored self locking nuts). The studs seem to be in good shape and are tight. I annealed the new gaskets, carefully inserted them into the heads and reinstalled the heat exchangers. I torqued the nuts to 20 lb/ft. ,started it up and let the engine warm up and then retorqued the nuts. I figured I was good to go. Once it was warmed up, again it backfires on deceleration. (IMG:style_emoticons/default/headbang.gif) WTF? So, now what? I don't want to keep running it for too long with the exhaust backfire and I am getting damned tired of taking the heat exchangers off and reinstalling. I am tempted to really crank on those nuts to tighten it down but I know I will snap a stud and then I will really be pissed. Is there any high temp sealant that will work? Any other ideas? Warrenoliver |
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Posts in this topic
warrenoliver Exhaust Leak May 27 2009, 07:57 PM
Joe Owensby You may have other issues causing the backfiring. ... May 27 2009, 08:33 PM Dominic
Is there any high temp sealant that will work? ... May 27 2009, 09:08 PM r_towle go drive the car...get it hot.
Pull in, jakc it up... May 27 2009, 09:25 PM
warrenoliver
go drive the car...get it hot.
Pull in, jakc it u... May 28 2009, 08:45 AM Pnambic
go drive the car...get it hot.
Pull in, jakc it ... May 28 2009, 10:30 AM wndsrfr Hmmmm........on these old FI units it maybe not an... May 27 2009, 09:31 PM banger Does the car still have the decel valve, and is it... May 28 2009, 12:18 AM kwales You might want to look and feel around the gasket ... May 28 2009, 09:49 AM Cevan Isn't 20 ft lbs way too much for those nuts. ... May 28 2009, 10:06 AM SGB 20 ft-lbs is PLENTY tight. Are you sure there are... May 28 2009, 10:09 AM rjames
Yes you will be, ask me how I know. :headbang: ... May 28 2009, 11:02 AM  |
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