Posted by Horse-George on February 02, 2008 at 21:39:57 from (204.73.103.253):
This message is a reply to an archived post by fDean on September 29, 2005 at 18:59:53. The original subject was "Re: Screwed not what you think".
I just had this choke plate screw come out of the choke shaft on my Farmall H. I was pushing a round bale across ice and was backing away from the bale to get another run at it. I had the engine running at a brisk speed but not wide open. All of a sudden the engine just stopped. Not the usual winding down, like when it runs out of gas, but it was an abrupt stop. I left it roll back downhill to a flat spot and tried to restart it. I heard a loud metallic knock, and was afraid I had broken a rod. I carefully checked the engine and found gas pouring out of the carb. I shut off the gas valve and the left the ignition switch off. I cranked the engine and no longer heard that knock. I turned on the ignition and the engine started and ran for a few seconds until the gas in the carb was used up.
At this point I wanted to get it off that cold pasture and to the garage. I opened the gas valve just a tiny bit, started the tractor and drove it about a quarter mile to the garage. It died in front of the garage when I slowed down, and once again I saw the carb was dripping gas.
I went to work checking the carb, and tapped on it thinking the float may have been stuck. Thats when I noticed the choke lever would come partway out. Removing the air intake, I found the choke screw was gone, and nowhere to be found. Although this is an updraft carb, I do believe it was sucked into a cylinder.
I have since replaced that screw, (put locktite on it). I also opened the fuel bowl and cleaned it out, but did not do a complete rebuild because the local dealer did not have the full kit.
The engine is now running, and after some carb adjustments, seems to be running ok, except it seems to have a bit of vibration to it.
I have been rather worried ever since. Did the screw get embeded in a piston? Does it need to be removed? Was a valve damaged? Was the cylinder wall scored or did a ring break? And my biggest question is what caused that loud knock? Could that just have been the result of liquid gas getting sucked into the cylinders, or was it that screw? I am not going to feel comfortable using the tractor until I learn more what happened, especially considering that screw may still be in the intake manifold or somewhere and waiting to destroy the engine. It still amazes me a metal screw could be sucked upward that far.
Someone in an archived message said that they put a thin brass screen in the carb intake (at manifold) to prevent these screws from getting sucked into the engine. Is this something I should do, or is the locktite enough? (I also thought about putting some JB Weld on the screw head, but I'd never be able to get it out again).
One other thing. When I opened the carb, I found the float bracket was broken on one side (by the hole, on the side that pinches together), and the float pin was barely holding. This is not a part my dealer said they had and doubted they could get. I had a local machine shop use a TIG welder and weld a washer to it. I think this should be ok, but can these brackets be gotten?
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