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Case 480 B Construction King (gas engine)

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PostPosted: Wed Jul 02, 2008 10:02 am    Post subject: Case 480 B Construction King (gas engine) Reply to specific post Reply with quote

I have a friend that just got a Case 480 B Construction King gas engine back hoe. He tells me that there is what looks like a solenoid on the carb that must be a fuel shut-off. He has to turn the gas off when he shuts the engine off or it leaks from the carb, so he thinks the solenoin doesn't work properly. Its 325 miles from where I am, & I can't get there to look at it.

I told him the carb probably needs cleaning & float adjusted. I assume it has a needle and seat like all the gas carbs I've ever been into, but then its a lot newer than anything I usually work on. He says he doesn't think the carb has a problem as it runs like a top & has plenty of power, but it does want to "diesel" when you shut off the engine.

Does anyone know what up with this or have any suggestions to solve the problem? Thanks for any advice, it will be appreciated.
(My $0.02 worth. jal-SD)
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Joined: 28 Sep 1998
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PostPosted: Thu Jul 03, 2008 2:42 am    Post subject: Re: Case 480 B Construction King (gas engine) Reply to specific post Reply with quote

The carb is no different than any other in that the needle and seat contol the fuel flow into the carb, you are correct that leakage from the carb is controlled by that. The solenoid is an attempt at "anti dieseling" and was somewhat effective but I have seem dieseling occour despite it. Clean, renew the n/s assembly, and reset the float level. If useing a viton tipped needle DO NOT put any pressure down on the needle other than normal float weight while setting the float level as you can "cut" or imprint the viton surface with excessive pressure which will ruin it. Make sure the solenoid is working by energizing it with a battery it should snap and withdraw the needle. Also some had the main adjusting screw for the high speed mix on the end so inspect it caefully to make sure that the high speed mix is or is not set there and adjust if needed. mEl
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