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Joe The most probable cause is the O rings at the bottom of the sleeves that are leaking. This could be compounded by electrolisis that eats away the sleeve and block. If your tractor has been stood a long time however I would take a punt that the O rings have just perished and are now leaking. Also the piston rings sound like thier used by date has passed. The O rings are not expensive, but you will need a head gasket set and a new sump gasket. This is what you will need to do: 1 Remove head
2 Remove Sump
3 Remove the Piston/rods.
4 Remove Sleeves.
5 Clean O rong grooves at bottom and top of the block (your engine will be the later type with 2 O rings per cylinder).
6 Replace O rings.
7 Re install sleeves.
8 Re assemble the rest of the engine. To remove the sleeves you will need a sleeve puller. Make one from two foot of 3/4in threaded rod with two nuts. You will need a pice of 2in wide by 6in long by 1/2in thick plate with a hole in the centre to go on the top of the block. The rod drops through the hole and I place two blocks of wood either side of the sleeve to make a bridge with the plate spanning. For the bottom, get yor local machine shop to make you a large "washer" 104 mm diameter with a 98mm diameter step. The hole is for the threaded rod. Make sure the crank is at bottom dead centre and I usualy wrap a clean rag around the journal because a lot of crud will fall out when the sleeve is removed. Also, dont hit the crank with the pulling rod. The step in the washer faces up into the cylinder. The sleeves take a bit of moving so make sure everything is square before you start to pull one out. Depending on you budget and how good the tractor is I would at a minimum install new rings and big end bearings. They are not that expensive. Check the sleeves where the O ring sits, if its badly coroded you may be better geting a engine kit. There are two kinds, one that does the whole engine and one that just has pistons, sleeves, big ends and gaskets. By the time you buy gaskets, rings and bigends, the basic kit may not be that much more. Hope this hasn't spoiled your day out. I am just about to rebuild the engine in my Super Major. Steven B
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