okay, i just returned from the garage. i ripped the block apart, removed flywheel, piston, camshaft, crankshaft, balance gears. pretty much everything except the vavles. looking at the bore, it MAY have been rebuilt not that long ago. i still see cross-hatching, which to me means that someone at least did a hone on it not to many hours ago. i havent miked anything yet. thats the plan for tomorrow. the only kohler i have ever fully rebuilt was a k161 on an old b****s ridematic tractor, that was 10 plus years ago, but i have worked on kohler quite a bit. i love them cause they built them well and im famaliar with them, kinda like an old freind. anyways i couldnt get over the size of those main bearings, its huge really heavy duty hardware. its allot bigger than the k161 main bearings were. anyways, i will take a close look at the bearings but they may or may not require replacement, they are quite durable.
the camshaft fell apart into 2 peices when i removed it, completely shot. im going to look for another good used cranshaft since the keyway is messed up. im also going to have to replace the governor gear. its badly chewed up.
looking at the block, it has some damage itself, but i feel it may be still useable. it has a chunk missing at the bottom of the bore past the cooling fins. i think it may be below piston travel but im not sure. looks like damage caused by the balance gears.
balance gears do a horrible number on these engines when they fail. it looks like it was a big mistake for kohler to even use them. many a good block ruined due to their useage. i will NOT be using them. im glad my k301 on my other tractor doesnt have them.
there is an online seller who sells weights that you can have machined to the crank that is supposed to eliminate the vibrations these engines are known for. my k301 doesnt have balance weights, and while i prefer it that way it does tend to vibrate more. it was originally an engine fitted to a tractor that had iso mounts, the current tractor its on does not. the 147 doesnt have iso mounts either, so i think the weights might be a good idea.
if the block is savable, it might not need a piston or cylinder work. i will have to have proper measurements taken to make a judgement on it. it might be an oversized piston as well. it had some carbon on it which i would have to clean off to see any markings. i didnt look at it closely yet either. usually carbon deposites can indicate a good seal. if it has the carbon washed away, this means that the rings are shot and are washing away the carbon with oil. oil is the result of blowby and bad rings/bore.
how do i remove the governor gear, i have never done one of these. they generally dont fail but that balance gear ate it up