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Those four bolts are also used to hold the rear loader bracket. There's nothing special about them other than they are 5/8 x 1-1/2 grade 5. If you take the plate off and pieces fall out those are broken pieces of the clutch. That's not good news. Oil can come from the flywheel seal of the engine, from the shafts of the transmission or the multipower valve. Engine oil may be different character than transmission oil, like black when dirty. The 135 concentric transmission input shafts wear and the seal leaks. Fixing it requires splitting the tractor, and getting new shafts and seals or getting the grooves that are worn in the old shafts welded up and ground back to diameter and new seals. There are some o-ring seals on the multipower valve. It can't be accessed until the tractor is split at the clutch. It leaks worse when the multipower is in high range, because that's when there's pressure on the multipower plumbing. Most MF tractor owners watch the oil level and the amount of drip and keep running until the oil on the floor gets too annoying, then we fix it. My 135 was fixed 12 years ago, maybe 800 hours ago and drips a little. I suspect the multipower valve because that wasn't fixed. The bother of splitting delays much work in that area. There should be a hole in the bottom of the bell housing under the clutch with a cotter key in it to let oil leaks out. I think maybe the crankshaft seal might be replace after pulling the pan without splitting the tractor to remove the flywheel, but I've not tried it. Gerald J.
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