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John Deere Tractors Discussion Forum
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1948 Model A engine oil leak

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Allen, minnesot

11-03-2004 16:56:33




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Hi, I have a Model A which leaks oil at the bottom of motor block where block gasket and where its connected to the main body of tractor. I just tightened 6 block nuts few days ago and did manage to move a bit tightening them. I drained oil and will add oil to it . Im wondering if this will stop leak or if I need a new gasket. It has high compression pistons and the compression are good. Tractor was given to me by my Dad. I hope tightening the nuts will solve it. Do I add additive like gasket stop leak or something?? Thanks for the input. Allen

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Mike M

11-05-2004 09:45:43




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 Re: 1948 Model A engine oil leak in reply to Allen, minnesota, 11-03-2004 16:56:33  
This is a very common problem with these. If it was ran long with the loose bolts the gasket may be torn.If it still leaks you can put in a new gasket without a complete tear down. I have done a couple by splitting the tractor at this area much like doing a clutch in a more conventionaly laid out tractor. I built a stand to bolt to the front frame rails to hold it from falling over and to support it up. Take off the engine top cover unbolt the rods and shove the pistons and rods ahead,unbolt the fanshaft at the governor housing,remove steering shaft,unhook any wireing and anything else that will keep the 2 halfs from comeing apart
then unbolt the block. I support the back half with a large floor jack in from the rear,then unbolt the frame and roll it apart far enough to get in there and clean it up and put in a new gasket. Just block and support everything for safety and you will be fine.

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1945A

11-04-2004 11:11:08




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 Re: 1948 Model A engine oil leak in reply to Allen, minnesota, 11-03-2004 16:56:33  
Sounds as if you need a new gasket, if you"re talking about a leak between the block and the crankcase. I"m pretty sure that a gasket sealer additive will not solve your problem. Having high compression pistons shouldn"t make a difference, since the crankcase should not have any pressure to speak of (it vents through the oil fill cap).... I"d be sure that the oil level was not too high (on my "45, you open a plug---if oil drips out, then the level"s okay, if not, you add oil until it does). The other thing to check, would be that the oil fill cap screen isn"t plugged, so that the crankcase can vent.

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