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John Deere Tractors Discussion Forum
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'48 B sounds and noises

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C DC

12-14-2007 12:53:24




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A few days ago I posted about compression testing. I had 93lbs and 95lbs, after 4 revolutions, turning with the starter. It was one persons opinion that was probably an OK reading. I"m not disputing that because I really don"t have the experience.
I am curious though, as I turn the engine over by hand, there is a "hissing" or "wheezing" that can be heard in the case. ( I have the governor assembly off) After a couple of full revolutions, this stops.
I am assuming because oil has moved towards that part of the engine by then and "sealed it". (the oil pump works great, even turning the engine over by hand a few times, oil comes out the oil pressure line and the hole under the governor)
Has anyone else heard this hissing? Is it normal?

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RobMD

12-14-2007 18:02:26




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 Re: '48 B sounds and noises in reply to C DC, 12-14-2007 12:53:24  
sounds like a putt-putt to me. They like to make noise. Now, a rod knock is easily felt through the clutch lever and a piston knock is felt through the head and valve cover.



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John T

12-14-2007 15:24:55




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 Re: '48 B sounds and noises in reply to C DC, 12-14-2007 12:53:24  
Mine always kinda hiss when cranked slow due to compression sneaking past the rings or valves NOT TO WORRY MATE and theres a lil valve click n clack n toss in a lil governor gear whine.

JT



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machinery-man

12-14-2007 13:12:30




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 Re: '48 B sounds and noises in reply to C DC, 12-14-2007 12:53:24  
All is normal....if you listen close on these tractors you will hear all kinds of noise....



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