Re: Water in carb?


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Posted by David Sherman on Saturday, December 30, 2006 at 23:55:15 :

In Reply to: Re: Water in carb? posted by Todd Wilson on Saturday, December 30, 2006 at 23:20:01 :

Even if there's no heat riser flapper, I'm quite sure the passages in the castings are the same. When I took the manifolds on my sno-cat apart, which had been icing up to the point of losing lots of power, the passages were completely full of carbon. This was with an engine with good compression and a properly-functioning carb. That manifold of yours has been together for a long time. If the carb was acting up, maybe the guy before you drove it around with the choke part way on. Maybe it was just a lot of cold starts and short trips. These trucks were made to work in all kinds of weather and should not ice up if everything's working right.

By the way, it is possible to get the manifolds off without breaking the studs. Patience, kroil, and/or a torch are your friends there. Don't forget the stud that's up under the carb where you can't see it. When putting it back together, if the some of the studs came out of the block, be aware that some of them go into the water jacket and need sealer on them. Special brass manifold nuts and extra-thick washers are best when re-assembling it. Get the stud threads good and clean with a wire wheel or run a die down them so you can get a nice even torque on the nuts. The brass nuts won't work loose from the heat, and they'll be easier to get off next time. Get the whole manifold assembly milled flat AFTER putting the two halves permanently together. Mine was very rough where the two pieces went together, and I figured the exhaust temperature was too hot for red (high-temp) RTV so I doped the gasket up with black asbestos furnace cement on both sides. So far, it's holding. You can't get the asbestos kind nowadays, but they have something similar that's fairly decent. The block had some rough spots too, but since there's no easy way to mill it, I put some red RTV on it, figuring the block can't get all that hot with water inside it.

I know it's a piece of work to take it apart and clean it up, but it will be worth it. It may also improve your power and fuel consumption by making sure that more of the fuel vaporizes in the intake manifold.



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