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Case Tractors Discussion Forum
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WHAT cause valves to burn in a 611b

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dufrain

04-10-2005 20:15:16




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I have been working on a 611b I got a few weeks ago.I heave read all post on them in this forum and the people that have them say they have problems burning the valves.Well I did a compression test and has 30 on 3 of the cylinders and 60 on one.I pulled the head and the pistons have almost no carbon ,the walls are smooth and there is no ridge.Its almost like new .The valves though are burnt up and it looks like I will have to replace some of them.Anyone have any Idea whats causing this.I wonder if if some of the cylinders run leaner than others.

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martin in DE

04-11-2005 16:37:18




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 Re: WHAT cause valves to burn in a 611b in reply to dufrain, 04-10-2005 20:15:16  
Don't forget that when those tractors were built there was lead in the gas. Now if you don't rework that head or use a lead additive and work that engine hard,you will be pulling that head again. Regards Martin



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CASEPOWER

04-11-2005 13:34:43




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 Re: WHAT cause valves to burn in a 611b in reply to dufrain, 04-10-2005 20:15:16  
Too Lean, valve adjustment to close, ignition advanced too far, Vaccum leak sucking air (causes lean running also). Also possible that the last valve job (if it had one), left the valves too thin after grinding.



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