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Author Topic:   carb gasket leak
Dirt Maniac

Total posts: 119
posted July 31, 2005 10:28 PM  
I just bought a rebuild kit for my Rochester 4 barrel carb. I have it all put back together, and had checked the float level. After running the motor for a few minutes, I noticed the edge of the top gasket (between the air horn and main carb) was looking pretty wet (with gas). Is this normal? I re-checked the float level, and made sure all the bolts were tight. Any suggestions?

Dirt Roller

Total posts: 13
posted July 31, 2005 11:42 PM  
Engine vibrations cause "surface splashing" of the fuel in the float bowl and this wets the gasket. Depending on it's material, the gasket may swell some and seal better. Just watch it and if it is coming down the outside of the bowl then some re-work is in order... like lapping the mating surfaces to cure a warpage. If when you remove the top of the carb. a 6" scale can be placed flush across both surfaces then warpage can be detected and the proper lapping done otherwise "lapping" is out and Sealer is in... actually, I think in your case, just use the sealer (Sparingly)" in the first place.

You've got to be sure the float is set correctly so double check that and if the float uses a needle and seat of brass, then remove the float and tap the needle against the seat lightly a few times. This will assure a positive fuel cut off by the float mechanisim. If the needle is neoprene (non-metal), leave it alone

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