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1940 B
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Water in Crankcase

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Mike from CT

06-04-2003 20:11:26




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I'm in the process of restoring a 1940 B. The cylinder head has been off for a valve job (including a new head gasket and lead washers) but otherwise the engine appeared to be in sound condition and remained untouched. My problem is now I have several quarts of water in the oil. The engine has not been fired up since the valve job. I did not operate the tractor long enough prior to the restoration to know if this condition existed prior to pulling the head. Any suggestions of where I should start looking for the water leak would be appreciated. Thanks.

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David Bacon

06-05-2003 20:58:43




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 Re: 1940 B - Water in Crankcase in reply to Mike from CT, 06-04-2003 20:11:26  
The old boys say look at the push rod tubes first and if you do not find the problem you probably did not look good enough the first time.



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Paul from MI

06-05-2003 19:31:28




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 Re: 1940 B - Water in Crankcase in reply to Mike from CT, 06-04-2003 20:11:26  
I agree with the previous posts, but had a wierd one on my 1944 B. The engine had been allowed to freeze at some point, because the head and water pipe had both been welded. After I used it a few years it developed a slow water leak into the oil. It turned out to be a crack in one of the pushrod passages in the block. Good advice-take it apart slowly over a few days and watch fro leaks after you remove each major part. It'll show up somewhere if you wait and look carefully. There are some scopes that let you see inside the cylinder thru a spark plug hole. They're probabnly pretty expensive, but if you could borrow one or get someone to do it for you it might be money well spent. Good luck, Paul

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John T

06-05-2003 05:54:17




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 Re: 1940 B - Water in Crankcase in reply to Mike from CT, 06-04-2003 20:11:26  
Mike, the usual culprits are a leaky head gasket or a cracked head or block and very often the push rod tubes are leaking. Since it has a new head gasket and wasnt warmed up and is leaking, I also suspect the push rod tubes are leaking. Was it necessary during the valve job to drill out any of the manifold studs????? ??? If so, its quite possible they were drilled too deep, cuz those tubes can be drilled into or through if the bit goes doawn too far. If they need to be replaced, I suggest you keep them in the freezer overnight and just until time to drive them in, that really seems to help.

John T Nordhoff

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Clooney

06-05-2003 03:19:25




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 Re: 1940 B - Water in Crankcase in reply to Mike from CT, 06-04-2003 20:11:26  
Mike, as Will said it could easily be the push rod tubes that run through the cylinder head.
~If you drilled any exhaust manifold bolts out be especially suspicious of those push rod tubes as they are real easy to drill into.
~To check...just pull the valve rocker shaft & pull the push rods then jack the back of the tractor up [or lower the front], then fill with plain water, & watch the push rod tube ends. If they are leaking water will run out the end of the tubes & show which one(s) are leaking.
~If the tubes aren't leaking then you will have to look for a head gasket problem or head/cylinder crack...

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Will P

06-04-2003 20:31:46




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 Re: 1940 B - Water in Crankcase in reply to Mike from CT, 06-04-2003 20:11:26  
Did you replace the push rod tubes in the head? If not, I would look there first.

Will P



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