Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Marine application - 1980 Mercrusier 260 idle OK under load, high in neutral

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Cliff Ruggles:
Being "rebuilt" more times than not isn't telling us anything, and it's likely to be as bad as, or even worse than before it was touched!

Right to start with, especially with Marine carbs, folks do NOT use the correct Marine components, which REQUIRE the high flow N/S assembly, special accl pump, etc.

99 out of 100 times you'll fine the power piston hanger arms bent, so the job is doomed there as well.

Marine carbs also live in a crummy environment, wet all the time, and the fuel sits for weeks, months and even years w/o being freshened up, so they get to digest a lot of stale fuel and water, plus a good amount of sediment and other debris.

Marine carbs also have very tiny idle tubes, not being emission calibrated, so they are almost always "varnished" up, and often plugged solid, so even IF everything is done correctly with good parts, it's still not going to work well, if at all.....Cliff

CanyonDoug:
Cliff, help.  Carb just got back today (UPS took their sweet time)... doesn't appear to be any gasket, but instead, two, thicker, spacers...?one is marked 1140, the other is 2269-something... If I try to use these in place of a gasket, the mounting studs are way too short... Seem to be adding 1/2 or 5?8" to overall thickness.

If that is the intention, then I guess i need to get new studs of the proper length. Can you advise what size studs?  The two in the back are firmly screwed in.. not sure if I should try taking then out with a small pipe wrench or vise grips... heat them... or maybe I just accidentally got the wrong stuff???  Was really hoping to mount it, dial it in and splash it, but I am kinda dead in the water.  Hope you can reply tonight...
Many thanks,

Doug

Cliff Ruggles:
Those are the two most common gaskets used with Marine applications.  Unfortunately they don't specify anyplace what gasket goes under the carb for any particular Marine set-up. 

We can supply a thinner gasket if that is what you need.  Do you have a picture of the old one or know what thickness it is?.....Cliff

CanyonDoug:
Worked great... One of your gaskets was like the Mercury one. Runs beautifully!

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