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Carb/Intake Gasket seal
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Joined:
2016/3/1 6:56
From Houston, TX
Posts: 135
Hi,
Been fighting an idle and high rpm miss for a while (see project blog):
http://packardinfo.com/xoops/html/mod ... ASC&type=&mode=0&start=70

I've been trying everything to isolate with no luck. last week, I removed the intake manifold (with carb attached) and now that I reinstalled it, it runs even worse and won't idle below 700rpm. Very much a vacuum leak. Took some starter fluid and was spraying around the carb/manifold interface. When I squirted the driver side throttle shaft area, the rpm picked up. Due to the linkages, I can't tell if the rpm changed when the fluid hit the throttle shafts or the carb/manifold interface. Carb was rebuilt by Daytona so I am assuming they would have checked a need to re-sleeve the throttle shaft bores.

I pulled the carb off and as you can see from the attached photo, there is no indent in the gasket from the manifold side on the driver side, but a noticeable one on the passenger side. This makes we want to believe this is the source of the vacuum leak. I checked the carb nuts torque several times so I know each 4 nuts were the same. Should I just crank harder on the driver side? Or is there some RTV type material I could use and trust? I'm hesitant to use anything that fuel may deteriorate and end up in the engine.

I've had a miss since before I tore my engine apart, not sure this is related. Anyone have experience with these intake manifolds warping a little and need to be machined? I guess it could be the carb face could be the culprit too and bending when I torque down the nuts.

thanks
-Bob

Attach file:



jpg  20190914_153208.jpg (677.72 KB)
120663_5d7d5608acca0.jpg 2048X1536 px

Posted on: 9/14 14:10:46
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Bob
1955 Packard Patrician
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Re: Carb/Intake Gasket seal
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Joined:
2015/1/16 9:43
From sw, pa
Posts: 928
Maybe check the flatness of the carb bottom surface and the manifold with a straight edge.

Posted on: 9/14 16:14:07
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Re: Carb/Intake Gasket seal
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Joined:
2016/3/1 6:56
From Houston, TX
Posts: 135
I did check the carb throttle body/base plate with a straight edge both across each side and diagonally (corner to corner). Even with shining a light through the back it seems very flat to me.

I did the same with the mounting surface of the intake manifold. Mostly the same story, but as you can see in the picture there is a gap close to the forward, driver-side stud. It looks like the metal outside of the stud is slightly raised leaving a gap of about 0.009". When i got the car the 2 studs on the driver side would come out as the nut was rusted on the stud. Maybe years of torquing or overtorquing somehow distorted that corner?

I'm try to convince myself that even with a paper gasket thicker than 0.009", torquing down the base plate to the intake in this condition will cause the base plate to warp enough to allow air to come in. I squirted a lot a starter fluid around and when I hit the base plate to main body gasket (in the front) rpm would rise ~150rpm. Same thing if I squirted the air horn to main body gasket near the accel pump area: rpm rise.

Any easy way to deal with this? Multiple gaskets? Finding a machine shop that can make the manifold flat as flat can be sounds like the right answer, but i have a hard time finding those places

thanks
Bob

Attach file:



jpg  straight edge on intake manifold.jpg (393.57 KB)
120663_5d954f27926a4.jpg 2048X1536 px

Posted on: 10/2 18:33:15
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Re: Carb/Intake Gasket seal
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Joined:
2007/3/14 16:01
From New Jersey
Posts: 15625
No idea if that's the source of your problem, but if you don't want to take the manifold to a machine shop, it looks like it would be a simple matter to just dress off that corner with a broad, flat file. And maybe use a gasoline-compatible gasket sealant.

Posted on: 10/2 19:23:24
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Re: Carb/Intake Gasket seal
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Joined:
2008/10/28 6:22
From Simi Valley, CA
Posts: 620
For a gasket solution on badly matching surfaces, read my post #27 on how I solved it on my 32 901 sedan.

Posted on: 10/5 12:02:18
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