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Old 12/11/2011, 03:02 PM   #1
Mosesatm
 
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Carb Spacer Leak

Rob was diagnosing a carb problem for me and he told me to check the gasket between the intake and the spacer because gasket manufacturers are making the gaskets too small these days.

Talk about knowing his stuff! Check out the photo of the gasket I was using. The engine was sucking a lot of air through that gap, and it is the correct gasket!
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Old 12/11/2011, 09:29 PM   #2
CougarCJ
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Correct? We sell a Felpro gasket that looks quite a bit different.

Scott Behncke
1968 GT/CS 302-4V Honors flysis income beezis onches nobis inob keesis
West Coast Classic Cougar A good source for Mustang mechanical parts too.
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Old 12/12/2011, 09:49 AM   #3
robert campbell
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Scott,
I also get the same Felpro gasket by ordering specifically for a 1968 Mustang with a 4 barrel. This gasket is also correct for most all Ford applications that run this one inch spacer with the PCV port on the back. If not all of them!

I have a good local parts store that has some savvy people behind the counter that I have dealt with since the late 1960's. Some of the fast food part stores are not so savvy on this stuff.

That Mr. Gasket #54 gasket hangs on the wall and is given out all the time. Works great in almost all applications. Except ours!!

Rob
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Old 12/12/2011, 03:01 PM   #4
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Very good info. Is there a way to check it with the carb installed? Some sort of leak check.


Bret
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Old 12/12/2011, 04:11 PM   #5
robert campbell
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Bret,
You would be experiencing poor or fast idling characteristics when hot. Flat spots, and if you have vacuum gauge, a low reading that fluctuates at say 10 or 12 inches of vacuum. An engine that dies if you try to slow it down to normal idle. Now this assumes a stock motor with good initial timing at around 10 to 12 degrees BTDC.

A big cam can do some of the above.

I have heard of people spraying WD 40 or propane near the gasket area. If idle increases, when you do this, you may have an air leak there. Crap, you are near to me. Come on over on a sunny day!

Rob
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Old 12/12/2011, 05:29 PM   #6
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Quote:
Originally Posted by CougarCJ View Post
Correct? We sell a Felpro gasket that looks quite a bit different.
Correct according to Mr. Gasket.
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Old 12/12/2011, 05:31 PM   #7
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Rob,
Do you know that purpose of the notches at the bottom of the primary cylinders in the spacer?
Is it a problem if the gasket covers those notches?
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Old 12/12/2011, 07:40 PM   #8
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Arlie,
The notches are to feed vacuum to the openings/chambers in the spacer for the PCV port. Covering them by the gasket has no effect.

Rob
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Old 12/13/2011, 06:57 PM   #9
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The WD40 trick works. Spray it around the base of the carb and spacer.If you hit a vacuum leak spot, RPM's will rise, and you've found your leak.

Neil
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Old 12/14/2011, 02:25 AM   #10
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Rob, you have sun!!! on a "SUNNY" day, that could be awhile,LOL
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