Gasser help

[DAM7106]

Happy new year to all...
I've have a flooding...carburetor problem with a 6602 continental with the holley carb...
I have done my best to install an overhaul kit in the carb...
But I do not have any guidance for the float height or idle jet settings.
The Carb want to dump fuel and flood the engine.
I'm at a loss ...
Help...

I am ready to swap carbs if there is a direct fit option available...


Thank you in advance

Douglas

 

[Guyfang]

Douglas, please write your state of residence in the location block. Its one of the few rules here in the Forum. Thanks.

 

[country]

We have NOS carburetors in stock $299

 

[Karl kostman]

Your problem is going to have to do with the float or float height. First are you sure the float is floating? If for some reason the float is cracked or has a hole it will sink and the carb will have gas pouring out of it. Second make sure the float is moving on its shaft that it hinges on, it as the name implies needs to float in its movements no binding. Next look at the height adjustment it doesnt have to be exact but it does have to be close. I would guess you should be able to google the model carb and get the float height setting there and if you cannot find it I would email Holly and tell them what you need along with model and SN of the carb they are generally very helpful.

 

[NDT]

Suggest you ditch the troublesome Holley 885 for the military Zenith replacement that came out in the 70's.

 

[DAM7106]

We have NOS carburetors in stock $299

View attachment 913982View attachment 913983

Good evening Country

I would like to speak with you live if that's good with you.
7164670130
Thank you
Douglas

 

[G744]

I've been involved with 6602 carbs. As stated before, the Holly will bedevil you forever. The Zenith was the fix.

 

[country]

Good evening Country

I would like to speak with you live if that's good with you.
7164670130
Thank you
Douglas

daytime phone 215-332-0500

 

[WillWagner]

@DAM7106 , The holleys are troublesome, that being said, the one on the M62 is, so far, working OK however, the truck has not been put in service yet, but I did pop for a Zenith to swap it over when and if the holley starts acting up.

Get with DrEvilPorkchop, he might still have some left over. The Zenith I got from him is brand new, got a kit anyway, but doesn't look like we will need it.

As someone that works on this old stuff regularly, I can tell you that any engine that has a holley on it runs horrible, they are finicky and the crap gas we have now doesn't make them any better. The M114 has a nice 283 in it but is holley equipped, I cannot make it run right for the life of me. They will not hold a tune. Zenith carburetors are, in my opinion, MUCH easier to work with, a bit harder to find kits for, but I know a couple places. They even still have the power valves! I have rebuilt many zenith carbs and they all work flawlessly and hold a tune.

Get with Jon and see if he has any left. They are bolt on.

 

[m1010plowboy]

What is the fuel pressure going in to the carb?

I just saw the Continental 6602 manual in the bunker library but didn't grab it.

The 302 GMC 885 likes low pressure between 3-5lbs. If the pressure is correct then the next check would be float soup. Boil water, add float. There's nothing like the sound of a 6602 so hope it's an easy fix.

 

[WillWagner]

What is the fuel pressure going in to the carb?

I just saw the Continental 6602 manual in the bunker library but didn't grab it.

The 302 GMC 885 likes low pressure between 3-5lbs. If the pressure is correct then the next check would be float soup. Boil water, add float. There's nothing like the sound of a 6602 so hope it's an easy fix.

I didn't think of fuel pressure, only because when I first lit the 6602, the F/p was leaking and I rebuilt it with a kit from Then And Now. The pump, IIRC is a six piston unit, so it flows a boatload, but I am unsure of the pressure since it ran OK, with no leaks , after the pump rebuild, with the exception of a belly full of gas!

 

[msgjd]

had a holley 4bbl on a truck and it was always blowing out the power valve .. Then one day it coughed and next thing i knew the paint was peeling/burning off the hood as i was going down the road.. And that was the end of hollies around here except for the one still on my M51, which has not been a problem (yet) except for their typical quirks on the R6602's .. There's a new zenith sitting in the M750 trailer waiting for the day i get time or need to swap it

 

[Joe Bertram]

M51 with new fuel tank on it, came to find it today with a ton of pressure on it from thermal expansion. Had a vent hooked up to the top of the tank, a non-vented cap. Found it had pushed a ton of fuel into the engine oil pan talking gallons.
Drained everything, checked vent with a vacuum pump and everything seems open, checked oil pump for bad diaphragms and it pulls a vacuum and pressure when pumped by hand. Did it all push through the carburetor? Or through a vent line? Did I trash the carb? Holley I believe. Thank you. Joe

 

[Mullaney]

M51 with new fuel tank on it, came to find it today with a ton of pressure on it from thermal expansion. Had a vent hooked up to the top of the tank, a non-vented cap. Found it had pushed a ton of fuel into the engine oil pan talking gallons.
Drained everything, checked vent with a vacuum pump and everything seems open, checked oil pump for bad diaphragms and it pulls a vacuum and pressure when pumped by hand. Did it all push through the carburetor? Or through a vent line? Did I trash the carb? Holley I believe. Thank you. Joe

.
I would say you didn't trash the carburetor by pressurizing your fuel tank. All that gas dumped into your oil pan naturally means you have to change the oil. Drain it and refill... I would imagine that it might be worth removing your plugs and squirting a few "pumps" of marvel mystery oil onto the top of the cylinders. That way you don't wipe out your rings and score the cylinders.

Other than that: Have you verified that you have a working vent on the tank?

 

[m1010plowboy]

There's a Canadian story where the mechanics would leave a key on when someone getting hazed was going to drive the truck. Under the right circumstance the carb float would stick, fuel would pour through the engine into the exhaust....and when the hazee hit the ignition, the muffler would explode. Fun stuff.
Likely discovered by accident, fuel pumps can fill an exhaust or crank case so now we can add heat expansion to that discovery. That's good motivation for folks to check the vents and caps prior to hot days.

There's also a spec.......maybe I saw it in a Canadian manual, or American Arctic Operations AAO, where gasoline is added to the oil in cold conditions. There's a certain volume of gasoline that's poured into the crank case to keep things fluid and I even recall that the gas evaporates due to engine heat......so now I gotta go hunt for that book.

 

[Joe Bertram]

Definitely doing an oil and filter change, ordered vented caps for the fillers to hopefully remedy the situation from happening again. I will pull plugs to take a look and fog them to replace lubrication washed off my the gasoline. Thank you for the insights

 

[G744]

If I remember correctly, the 6602 uses hard chrome cylinder liners and iron rings.

Very tough to score them.