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Old 12-21-2018, 08:16 AM   #1
steve40490
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Default 49 Custom exhaust leaks

I have a 49 Custom with Exhaust leaks on engine. I want to install all new exhaust gaskets. How hard of a job will this be ?
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Old 12-21-2018, 08:38 AM   #2
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Default Re: 49 Custom exhaust leaks

The biggest issue is bolts breaking off. Use plenty of penetrant and patience. Maybe a little heat from a torch. If you break one off on a manifold, accessibility with the proper tools to remove the broken bolt is going be tough. I’m sure others will add more advice.....Mark
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Old 12-21-2018, 09:30 AM   #3
19Fordy
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Default Re: 49 Custom exhaust leaks

If the previous installer used anti seize you will be lucky.
Do as flathead ford8 says. Be sure to use antiseize on the reinstall. I think there are two different size bolts. I also used 2 gaskets on each port for a good fit.
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Old 12-21-2018, 09:33 AM   #4
51 MERC-CT
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Default Re: 49 Custom exhaust leaks

Have you tried to tighten the offending locations.
May just stop the leaks without having to replace gaskets.
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Old 12-21-2018, 10:16 AM   #5
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Default Re: 49 Custom exhaust leaks

as 51 suggested but I would add warm up the engine first as the heat will make it easier.try turning left before right as that may save breaking the bolts good luck
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Old 12-21-2018, 10:35 AM   #6
WABOOM
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Default Re: 49 Custom exhaust leaks

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Originally Posted by 54vicky View Post
as 51 suggested but I would add warm up the engine first as the heat will make it easier.try turning left before right as that may save breaking the bolts good luck
Are they left hand threads??
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Old 12-21-2018, 10:48 AM   #7
flathead4rd
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Default Re: 49 Custom exhaust leaks

NO. Their standard. Lefty loosey, righty tighty.
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Old 12-21-2018, 12:38 PM   #8
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Default Re: 49 Custom exhaust leaks

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Are they left hand threads??
Turning left first will break it loose then right to try and tighten them. Same goes for removing them. Iíve never had luck with double gaskets. Always had a leak between them. If you do take the manifolds off, you can make sure theíre flat and get a good seal. If you repair it the best you can this time, you probably wonít have to mess with it again. Got any pictures of your car?.... Mark
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Old 12-21-2018, 12:56 PM   #9
WABOOM
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Default Re: 49 Custom exhaust leaks

OK, only reason I ask is because you said turn the threads left 1st... which is the way that you would turn them if you were going to loosen them. Were you trying to say to tighten them up a bit before proceeding to loosen them?
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Old 12-21-2018, 02:24 PM   #10
51 MERC-CT
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Default Re: 49 Custom exhaust leaks

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Originally Posted by WABOOM View Post
OK, only reason I ask is because you said turn the threads left 1st... which is the way that you would turn them if you were going to loosen them. Were you trying to say to tighten them up a bit before proceeding to loosen them?
Seems to be some confusion here.
" Have you tried to tighten the offending locations."
The quote from my previous post asked.
The procedure that I generally use is to crack the bolt loose first (turn left) which will give some indication if the bolt is loose. Then (turn right) to tighten.
This is to determine if leaks will seal without having to replace the gasket/s.
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Old 12-21-2018, 06:45 PM   #11
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Default Re: 49 Custom exhaust leaks

I just replaced the manifold gaskets on passenger side of my truck with no problems.I suggest you get a new can of PB Blaster(the new cans are designed to spray no matter how you hold the can!) and constantly soak the bolts for about a week or or so and tap the tops of the bolt heads with a hammer.Once you get ready to loosen bolts crank up engine and let it get as hot as you can get it.Gently start loosening the bolts and hopefully they will back off freely.

Last edited by 40ford; 12-21-2018 at 07:11 PM.
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