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Exhaust leak ?? #2435825
01/16/18 06:30 PM
01/16/18 06:30 PM
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S.florida
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Jupiter331 Offline OP
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Jupiter331  Offline OP
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S.florida
70 440 stock exhaust manifolds . Loud exhaust leak on passenger side. Sounds like it's just one port. There are no scorch marks or any signs of leak. Plugs are all tight. Manifolds still tight. Defiantly coming from the passenger side head area. Took the valve cover off because it almost sounds like a bent push rod or broken rocker arm. But everything checks out. Tried using a stethoscope and still can't pinpoint it. No oil or bubbles in the coolant. I do hear a hissing sound from the passenger side if I click the motor over without starting it. No cracks in the exhaust manifold. My only thoughts at this point are a bad valve or head gasket.....Any thoughts?

Re: Exhaust leak ?? [Re: Jupiter331] #2435833
01/16/18 06:47 PM
01/16/18 06:47 PM
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Sobieski Wi
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bee1971 Offline
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Sobieski Wi
Are You Using Exhaust Manifold Gaskets ?

The Fel Pro Exhaust Gaskets That Everyone Uses , Will Burn Out Or Leak Overtime , Especially If Your Manifolds Are Warped

I Finally Had Both Of My Original Exhaust Manifolds Planed At The Local Machine Shop

RemFlex Makes A Nice Manifold Gasket

Why Not Fix The Exhaust Leak First By Pulling The Manifold , Then Go From There

Also It Could Bee Leaking From Where The Header Pipe Attaches To The Exhaust Manifold

Last edited by bee1971; 01/16/18 06:49 PM.

1971 Dodge Charger Superbee
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Re: Exhaust leak ?? [Re: Jupiter331] #2435836
01/16/18 06:52 PM
01/16/18 06:52 PM
Joined: Jan 2003
Posts: 10,483
Freeport IL USA
poorboy Offline
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Freeport IL USA
Back side of the heat riser bushing bad? (or is that on the driver side? Old memory sucks. Gene

Re: Exhaust leak ?? [Re: poorboy] #2436249
01/17/18 12:31 PM
01/17/18 12:31 PM
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pa.
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dan9 Offline
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Sometimes the heat riser will cause that sound.

Re: Exhaust leak ?? [Re: Jupiter331] #2436288
01/17/18 01:26 PM
01/17/18 01:26 PM
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Posts: 9,436
Blair County,PA
62maxwgn Offline
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Gasket or no gasket ? Check the manifold with a strait edge !

Re: Exhaust leak ?? [Re: Jupiter331] #2436312
01/17/18 02:01 PM
01/17/18 02:01 PM
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Alberta
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rustbuckett68 Offline
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Alberta
Use a length of heater (garden) hose like a stethoscope to pin point the leak. One end around the noise, the clean end to your ear.

Re: Exhaust leak ?? [Re: Jupiter331] #2438336
01/21/18 12:30 PM
01/21/18 12:30 PM
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jersey
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Spaceman Spiff Offline
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jersey
Dribble a small amount of atf down the carb with the engine at a fast idle. Watch for smoke from where the leak is.


526 cubes of angry wedge, pushbutton shifted, 9 passenger killer!
Re: Exhaust leak ?? [Re: Spaceman Spiff] #2438359
01/21/18 01:09 PM
01/21/18 01:09 PM
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Lost and Spaced
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bboogieart Offline
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My experience has been the forward most stud will brake.
Seen a lot of this.
The bolt stays in place due to it's long association with the connecting parts, makes it hard to notice.

Your memory is fine Gene, the heat riser is on the drivers side and can also cause these symptoms. up


I have mechanical Aptitude.
I can screw up anything.
Re: Exhaust leak ?? [Re: Jupiter331] #2438365
01/21/18 01:15 PM
01/21/18 01:15 PM
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Posts: 3,462
Back in NJ....
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EWJ Offline
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Back in NJ....
Also the choke stove can leak.


Ed
EastCoast Land Yacht Assoc.
1967 Newport Conv: 440/4 speed
1969 GTX: 440/4 speed, TX9/TX9, A34, N96
1970 Super Bee: 383/4 speed, B5/B7
1970 Coronet RT: 440/4 speed, A34, N96
1970 Coronet RT: 440/auto, A36, N96
1970 Road Runner convertible: 383/4 speed TX9/D6XW
1970 GTX: 440+6/727, A32, N96
2001 Dodge 2500 HO CTD, 6 speed, 4x4 quad cab long bed
"The early bird may get the worm, but the 2nd mouse gets the cheese".
Re: Exhaust leak ?? [Re: Jupiter331] #2438377
01/21/18 01:27 PM
01/21/18 01:27 PM
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Lincoln Nebraska
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RapidRobert Offline
Circle Track
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Lincoln Nebraska
Quote:
I do hear a hissing sound from the passenger side if I click the motor over without starting it. Any thoughts?
I'd disable the ign & crank it & see if you an pin it down with the stethoscope or heater hose. You might spray some dish soap/water in there & see what bubbles up & I'd try it with no ign then if no results start it & see if you see anything & I'd do it cold so the heat doesn't vaporize the liquid & make diagnosing this more difficult. they say exhaust leaks and some types of valvetrain noises sound incredibly similar. Holler how it turns out.


live every 24 hour block of time like it's your last day on earth
Re: Exhaust leak ?? [Re: Jupiter331] #2438545
01/21/18 07:24 PM
01/21/18 07:24 PM
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Posts: 152
usa
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smos001 Offline
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I bought a CO test meter on Ebay. Great buy. I use it as a sniffer. It is very sensitive. I used it to find leaks in exhaust.
It even help me diagnose a bad head gasket in a 440 once. I had it sniff CO in the radiator. Caught it while the chemical tester was inconclusive.

The meter I bought was a used construction grade level CO tester.
You just have to be careful that it does not get a whiff of the tailpipe. It is very sensitive.

Re: Exhaust leak ?? [Re: smos001] #2438563
01/21/18 07:45 PM
01/21/18 07:45 PM
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Lincoln Nebraska
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RapidRobert Offline
Circle Track
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Good reminder as I have one of those CO meters & I am gonna dig it out to confirm my head gasket issue is resolved (& I will keep it away from the tailpipe(s).


live every 24 hour block of time like it's your last day on earth
Re: Exhaust leak ?? [Re: Jupiter331] #2438801
01/22/18 12:56 AM
01/22/18 12:56 AM
Joined: Aug 2006
Posts: 2,487
God's Country Maryland
GODSCOUNTRY340 Offline
top fuel
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Posts: 2,487
God's Country Maryland
If you're hearing a hissing sound while cranking it over I'd say you've got a blown head gasket. The exhaust system will not build up enough pressure by just cranking it over for it to be an exhaust system leak.


I love the smell of Deer guts in the morning, it smells like... VICTORY!
Re: Exhaust leak ?? [Re: Jupiter331] #2438914
01/22/18 11:38 AM
01/22/18 11:38 AM
Joined: Jan 2003
Posts: 6,363
Abilene, Texas
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fastmark Offline
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fastmark  Offline
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Abilene, Texas
Just had this problem. It was a warped exhaust manifold. Check that first with a straight edge. Use the heater hose trick. It works like a stethoscope. Next I would try a leak down test. That will find a blown head gasket.

Last edited by fastmark; 01/22/18 11:38 AM.






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