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Post Info TOPIC: Quadrajet issue...


Canadian Poncho Superstar!

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Quadrajet issue...


As a few of you know, I rebuilt my 67 Quadrajet myself a while back. For the most part, it went well. A couple of weeks ago I complained of the engine falling flat on the top at wot. Well, she runs sweet now, right to the top until you hear the pipes really start to bark. The little 327 runs better now than it probably has in it's entire life. Idles totally smooth. Absolute calm at 60mph.

Problem is, now it leaks gas through the base gasket  on the drivers side when you turn the engine off. Enough to pool gas in the depression in the intake. The gas runs back and drips down at the secondary lever.

It starts ok, but seems a tad flooded when hot.

Where is it leaking from? Is the float bowl overflowing into the intake?

Could it be leaky carb body plugs?

Any help?

The leak seems to start at the front and move back with the slant of the motor.
Base gasket only. Retightened bolts once 2 days after rebuild.
4596522473_c200628306.jpg

Mark

-- Edited by cdnpont on Monday 10th of May 2010 06:46:14 PM

-- Edited by cdnpont on Monday 10th of May 2010 06:48:32 PM

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65 Laurentian post, 67 Grande Parisienne 4 door HT. 
 


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Mark

I have very limited carb knowledge but I thought that the plugs that they always talk about leaking are an internal leak. Seems to me the carb drips into the intake when they are bad and then you have a hard time starting it (flooded) after it's been parked about 15 minutes.

As far as that leak goes, you have made sure all the top screws are snug?

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars



Canadian Poncho Superstar!

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Love your new avatar.


But why would loose screws cause a leak? It's a one piece bowl.


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65 Laurentian post, 67 Grande Parisienne 4 door HT. 
 


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Thanks. American Graffiti is my all time favourite movie!

I am just guessing I'm afraid Mark. I know what you are saying but I've seen some that seem to be leaking around the top gasket.

I still smile every time I picture Toad sitting beside Falfa at the light and Falfa puts the 55 to the rug in neutral.............

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars



Canadian Poncho Superstar!

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I'll always have a crush on Candy Clark.



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65 Laurentian post, 67 Grande Parisienne 4 door HT. 
 


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4 posts and we've totally forgotten about your carb problem.......

Although I agree with you!!!



You didn't make an effort to seal those 2 plugs inside there that they always talk about, the ones famous for leaking?

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars



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Carl Stevenson wrote:

You didn't make an effort to seal those 2 plugs inside there that they always talk about, the ones famous for leaking?

I agree.  I have rebuilt and tuned about a dozen Qjets over the years and I have always epoxied the plugs.  They always look good and leak-free, but Murphy won't tell you they really leak until you get the whole thing back together!  It's always cheap insurance to seal them when you have the whole thing apart.  I use JB Weld to seal them.

 



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'69 427 2+2 Convertible


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4598577066_53a586e59e_o.jpg

These larger ones and the smaller ones to the right are the well plugs.
I should have done them fron the get go. I'll pull the carb today.

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65 Laurentian post, 67 Grande Parisienne 4 door HT. 
 


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cdnpont wrote:

4598577066_53a586e59e_o.jpg

These larger ones and the smaller ones to the right are the well plugs.
I should have done them fron the get go. I'll pull the carb today.



If I remember correctly it is the two smaller ones that we always epoxied when we had a Q jet apart.

 



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1951 Chevy Styleline -- Gasser

1966 Chevy Biscayne -- Sleeper

 

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