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ah man?? After going on and on about how this must be the frost plug behind the timing cover? Maybe you guys should simply say I DONT KNOW when you dont know something. Thats a 6 hour job for nothing. And thank for nothing.

I now have the cover off. let me state this as clearly as I can: THERE IS NO FROST PLUG UNDER THE TIMING COVER ON A Z650 MOTOR!!!!!!!!! NONE AT ALL!!!!!!!!!:mad:

I think I spoke too soon! Now the woodruff key is giving me problems. Very stuck in the crank!

Ok I got it the pulley off. Took ALOT of heat and grade 8 bolts with a steering wheel puller. Soon as that cools off I can finally get that cover off..

I also tried a jaw puller like in your photos but broke off a chunk of the pulley in the process. Its tight. Tried a bit of heat but not much. Perhaps more?

Ive got the nut off its getting that pulley off thats the problem. I have a steering wheel puller that screws into the pulley but its so tight it bent the bolts.

Does anyone know how to get the lower pulley off the crankshaft? Looks like there is a special puller utilizing the two bolt holes on the pulley. Its on very tight.

Wow I know I must have got some of this right :) -The reason for rebuilding the head was this oil in the radiatior problem. I noticed it blowing oil STRONGLY out the overflow tube. Thats what got all this started. Talked to the kubota shop and they said most likely blown head gasket. So I took...

Ok I did those tests. No bubbles at all around the head/cyl area under pressure. The glow plugs have some fluffy carbon on them but thats all. No sign of oil or water. Is a compression test in order? Would have done that but I dont have that size adapter for the plug hole. Can get it though...

Ill start dissasembly tomorrow and report back. I truly hope that is what it is! Damon

Guys, The oil color is cloudy and its about 1/4" above the full level of the dipstick. The radiator has alot of oil in it but I know it floats on water so dont know just how much but if you stick you finger in the fluid it comes out pure oil. The tractor doesnt have more than 10 minutes...

Vic, My neighbor had the kabota field tech over to fix his tractor so I had him look at mine. He knew a few things I didnt. He said there is some water in the engine oil..not just water in the radiator like I had thought. He says most likely its a cracked block and I might as well look for...

Hi All, I need to replace the engine in my B7000 kubota.. Cracked block etc..this one is hopeless..It uses the z650 but I cant find that engine anywhere. Does anyone know if another 2 cyl engine will fit in this tractor? Thanks, Damon