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John Deere Tractors Discussion Forum
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40 B Valve Adjustment - Hot or Cold?

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B_Bob

03-10-2008 19:23:47




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Question on adjusting the valves on my 40B. I have the OM-R2005R owners manual - "all adjustment should be made with a cold engine", and the JD-4 IT shop manual - "adjust tappets to 0.020 hot". I understand the procedure, setting to be at 0.020, and have done valve adjustment on other engines but not John Deeres. Does it matter whether the engine is hot or cold to do this? Have not removed cover yet so I don't know the condition of the tappets - engine is in running condition.
Thanks, Bob

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john deere greg

03-10-2008 20:31:50




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 Re: 40 B Valve Adjustment - Hot or Cold? in reply to B_Bob, 03-10-2008 19:23:47  
I think i have read on here that when you set the tappets at 0.022 at room temp it is the same as 0.020 at operating temp which is what you want. I might be wrong though hopefully some one will correct me if i am.



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Mike M

03-11-2008 04:23:30




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 Re: 40 B Valve Adjustment - Hot or Cold? in reply to john deere greg, 03-10-2008 20:31:50  
That's the way I do them. .022" cold and the push rods do grow when hot so you end up with .020" hot I checked one once.



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