lcaplan
Member
Posts: 35
Reg: 09-18-04
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 06-19-10 06:28 PM - Post#1932947
I have a small leak at the exhaust manifold on my 235-6. The leak is at the top of the square port second out from the firewall. I feel hot gas escaping along the top edge of the port at that location. There is a noticeable exhaust note in the engine compartment I attribute to the leak. I tightened the bolts securing the manifolds to the block to no effect.
How should I correct this situation? Is the leak likely caused by a faulty gasket? If so can I, without removing the engine, separate the exhaust and intake manifolds from the block with sufficient clearance to insert a new gasket?
Secondarily to what extent would a small leak have on the performance and efficiency of the engine?
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jays_55
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Posts: 46
Loc: Mass. / U.S.A.
Reg: 09-11-05
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06-19-10 08:27 PM - Post#1933001
In response to lcaplan
It is not necessary to split the intake and exhaust manifolds. You can pull them both together (besides the new gasket set includes both intake and exhaust gaskets anyway).
Here is how I have done it though other folks may have different methods, this worked pretty quick for me.
Remove all the carb lines (fuel and vacuum), and the throttle linkage. Put a block of wood on a floor jack under the exhaust pipe where it makes a bend at the bottom. Loosen all the manifold bolts and start to jack up the exhaust until the weight just is off the manifold. Then remove the bolts, and you can gently pull the manifold assy. back far enough to clear the studs on the ends, while holding it balanced on the exhaust pipe. Then you can slide the old gaskets out and the new ones in.
The only thing to be careful of is the 3 split ring seals in the intake ports. Make sure they are seated properly in the intake manifold before you push the manifold gently back on to the studs. I usually put a little copper gasket sealer on all the gaskets before reassembly, it not only helps to seal them, but also helps keep the gaskets from moving around while you are pushing the manifold back into place.
Like I said, this is just how I have done it, other guys might have a better way, but this has worked for me a couple of times over the years. Hopefully this helps.
- Jay
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jays_55
Member
Posts: 46
Loc: Mass. / U.S.A.
Reg: 09-11-05
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06-19-10 08:29 PM - Post#1933002
In response to jays_55
Oh, I should add that you're exhaust header pipe has to be in good shape before you attempt to support the weight of the manifold on it. 
- Jay
Edited by jays_55 on 06-19-10 08:30 PM. Reason for edit: No reason given.
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 arnieg141
"2nd Year" Gold Supporting Member
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Loc: nj
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06-20-10 03:48 AM - Post#1933081
In response to lcaplan
no motor stay's. but it's better to seperate intake and exhaust manifolds.it's easyer in gasket instale buy good quilty gaskets AND DON'T LOOSE THE RINGS THAT SLIDE IN HEAD IF THERE MISSING .ALING SLEEVES http://www.parts123.com/parts123/yb.dll?parta~dynd...
| GET ER DONE .. AS I GET OLDER I LIKE FAST CARS I CAN STILL DRIVE. AND VERY SLOW WOMEN I CAN CATCH while still able..arnie garrison |
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 4dr 57
"2nd Year" Silver Supporting Member
Posts: 1658
Loc: The Texas Hill Country
Reg: 11-10-04
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06-20-10 12:27 PM - Post#1933258
In response to lcaplan
No expert here I would still suggest a good spray of PB Blaster..tap..tap..tap..tap, spray. Let it sit. Over night works best. The metal rings are reminicent of model T exhaust, and if they are indeed used with compressing type copper sealing rings they will need to be replaced with new. If not, another gasket should suffice. Be sure to inspect the head face and exhaust face for build up. Torque the bolts w/o a thread locker. have fun 
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arnieg141
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06-20-10 12:35 PM - Post#1933260
In response to 4dr 57
| GET ER DONE .. AS I GET OLDER I LIKE FAST CARS I CAN STILL DRIVE. AND VERY SLOW WOMEN I CAN CATCH while still able..arnie garrison |
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lcaplan
Member
Posts: 35
Reg: 09-18-04
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06-20-10 02:21 PM - Post#1933303
In response to arnieg141
 Thank you all for the information. I am a professional desk jockey and want to think this through before attempting on my own.
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arnieg141
"2nd Year" Gold Supporting Member
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Loc: nj
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06-20-10 02:40 PM - Post#1933310
In response to lcaplan
it's no big deal your a desk jockey where all kinds here. it's an easy job no matter what try one more thing while cold loosen the othere bolts a little tighten the two at leak first then the others.start it see how it is let cool retighten and check. if still leaks you need new gasket set.no big job even for a beginer. Thank you all for the information. I am a professional desk jockey and want to think this through before attempting on my own.
| GET ER DONE .. AS I GET OLDER I LIKE FAST CARS I CAN STILL DRIVE. AND VERY SLOW WOMEN I CAN CATCH while still able..arnie garrison |
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Alex Ross (4)
