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John Deere Tractors Discussion Forum
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3010D rear main seal leaks

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Jim Glidewell

08-07-2007 18:25:25




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I had the engine rebuilt last year; crank was turned. The shop that rebuilt the engine replaced the rear main seal twice because it was leaking. It started leaking again and I had another mechanic replace the seal one more time. It's leaking again. What could be going on with the crank to keep knocking out seals. Thanks,




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Michael Sheik

08-08-2007 05:06:48




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 Re: 3010D rear main seal leaks in reply to Jim Glidewell, 08-07-2007 18:25:25  
Does this same discussion apply to my '74 - 830 diesel utility tractor? It has some leakage that I am presuming to be from the rear main.



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K.B.-826

08-07-2007 22:23:36




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 Re: 3010D rear main seal leaks in reply to Jim Glidewell, 08-07-2007 18:25:25  
Is this work being done by a Deere dealer's shop, using the special tool and a Deere seal? I strongly agree with the comments below about the special tool, and following the directions included with the new seal to the letter. To really do the job right, the oil pan should be removed. The rear main seal housing and it's gasket should then be installed with the bolts loose. The special tool is then inserted around the crankshaft to center the seal housing, and at the same time you need to square up the seal housing to the bottom of the engine block, then torque the seal housing to engine block bolts. Put a light coat of silicone in the two spots where the seal housing meets the bottom of the block, and reinstall the oil pan. Then use the special tool to install the new seal. Also, make sure to put some sealant on the threads of the flywheel to crankshaft bolts, as the holes go all of the way through to oil. This probably doesn't apply to a 3010, but some of the later six cylinder engines had six flywheel bolt holes in the crankshaft, with only four actually being used, the other two having threaded plugs, gotta make sure the plugs have some sealant on them too. Might not be a bad idea to check the crankshaft endplay, and check the seal surface of the crankshaft for damage.

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ram ranch

08-07-2007 21:19:33




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 Re: 3010D rear main seal leaks in reply to Jim Glidewell, 08-07-2007 18:25:25  
maybe not the rear main seal. The oil pan gasket could be damage form the removal of the rear seal retainer. Which would cause oil to leak into the clutch housing.



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msb

08-07-2007 19:14:48




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 Re: 3010D rear main seal leaks in reply to Jim Glidewell, 08-07-2007 18:25:25  
Could be several reasons for the leaks. The newest rear main seal has specific directions that must be followed along with using a special tool to properly install the seal. Lots of ways to mess up the installation of the new seal.I would closely inspect the crank where the wear ring fits. It was an area that commonly leaked on the older style seals.The oil would seep between the crankshaft and the wear ring.Found some cranks that had gouge marks from someone being careless whn removing the old wear ring. I always used a light, but even coat of Permatex on the wear ring and never had a comeback that I ever remembered. The new seals say to never remove the wear ring from the seal, but its the first thing some guys will do in spite of the instructions.

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