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Restoration & Repair Tips Board

va case restore

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Lee W

04-03-2008 19:56:34




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Brand new to the site and I am looking for some info about a VA case. It has been overhauled engine wise but has since started pushing some oil past the small pipe sleeves that are on the side of the head. They are where the the pushrods travel in. Any thoughts why or how to solve appreciated. The head has been planed and the valves done also and tried a couple of different head gaskets.The same thing was happening to a different VA we had but we just used it anyway as we couldn"t stop the oil, but would like to restore and paint this one.

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Steve_Md

04-08-2008 04:45:43




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 Re: va case restore in reply to Lee W, 04-03-2008 19:56:34  
I have restored a VA series tractor and am working on a second one. It seems that most, if not all the heads leak/seep oil around those tubes that are swaged/pressed in the head. It leaks when the warm oil drains back to the pan through these tubes after lubing the rocker assembly. I have fixed two heads, of which, one has been in service mowing grass for a year now. One can fix the leaking tubes by thoroughly cleaning the oil and deposits around the tube tops where they meet the head with some spray degreaser or simular solvents. The pushrods must be removed from the head to do the job properly and for best results. Use compressed air and the cleaner a few times to work the deposits and oil residue from the tube mating areas. After thorough cleaning and dry, apply some high heat form-a-gasket or simular sealant to the tubes and head area to seal. Work the sealant into the joint to assure a good tight seal bead and allow it to cure completely. Insure the tube inside diameters are sufficiently open after sealing and their is no interference with the pushrods. Some other sealing possibilities are JB weld, epoxies, or cements that will withstand +200F temperatures and are impervious to oil/petrolium products.

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Joe (Wa)

04-08-2008 22:41:21




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 Re: va case restore in reply to Steve_Md, 04-08-2008 04:45:43  
Thanks for the info Steve, I was a little bit concerned about the sealant considering thermal growth.

I swaged the top 1/2" of mine today. Followed that with a tapered drift to the top edge. Tube metal is pretty soft.

I guess I'll know in about a week when I get it running.

Joe



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Joe (Wa)

04-03-2008 21:17:46




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 Re: va case restore in reply to Lee W, 04-03-2008 19:56:34  
Hi Lee, I've got the same thing on rebuilt head that I bought. I think it may be the hot tank cleaning they do. Mine seep down the tube from the top, all of them that why I think it has something to do with hot tanking.

Has nothing to do with the head gasket. The pushrod tubes are return oil off the head to lube the lifters, mid and aft cam bearings. The parts manual does not list any seals, I think they must be swaged or rolled in like you would install a tube in a tube sheet on a boiler or heat exchanger.

I have done tube rolling on ships but don't have a tool. Thinking about swagging. Be interested in other opinions on a fix.

Joe

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Lee W

04-12-2008 18:04:07




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 Re: va case restore in reply to Joe (Wa), 04-03-2008 21:17:46  
thanks for the info guys. I really like the site and the info and have hardly had time to explore it fully but will pass it on to some serious Deere and Oliver guys in our area. We have just one VA left out of the four my Dad had and I would like to paint and finish this one off and then do a little pulling against those M's and 330's and such!



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Lee W

04-04-2008 06:29:57




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 Re: va case restore in reply to Joe (Wa), 04-03-2008 21:17:46  
Joe thanks for the info. It sounds like the exact problem now if I can find someone or somewhere that can solve it I would appreciate it.

Lee



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