Lawn tractor w/less than 75 hrs. usage-engine seized

With the spark plug wire(s) disconnected, tilt the mower and try to turn the blade. The blade bearing may be seized. Do you hear the belt screeching ? That would be a good clue.

If you engine actually seized, it will not turn over at all, not ever with a ratchet on the crank pulley or vibration damper as most call it. If this is so, you have internal damage to your engine. I would say the oil pump shaft broke and cause the bearings to seize. You will need a complete overhaul. Zero oil pressure is the answer that tells me that major damage has been done.

personally too much hassle prefer Stihl Chainsaw more reliable Seizing is caused by lack of lubrication, First check all level has oil pump seized or is it sump type when running oil circulates all way round, Still there has to be a oil reservoir if this is bone dry theres your problem the rattling is metal on metal with no protection and the damage is seizing caused by lack of oil I have two chainsaws both have oil sumps and are kept full, please check hope this helps

Chances are pretty good that you either spun a rod bearing or broke a connecting rod. Either way you are probably looking at a costly repair.

If the engine runs dry of oil it will seize on the big eng journal, because the piston is still moving at speed the alloy roy will snap, you can just imagine the amount of damage caused inside the engine, i would suggest a new short block would be the cheapest way out of this now.

Ooooh, sounds bad. Can you turn the engine by hand? If not, engine is seized. Can you turn it freely a little and then it hits a hard stop? Then the connecting rod is broken. The good news is a seized engine is not guaranteed to be a death sentence for the engine. There are ways to free it, then inspect for damage. The connecting rod, may have done damage to the block or not, depends on where it failed. The connecting rod requires disassembly of the engine to fix.

How was your oil level when it happened?

You are probably correct by saying the engine is half siezed. Rust will get inside the cylinder if it is not used very often. This is a common problem. You are doing the correct thing by turning the engine over with a wrench while putting oil or penetrating oil down the cylinder. The cylinder usually cleans up after a while of turning the engine. But please note that if this is the case then rust has gotten into the cylinder and it may have caused some damage. I have "broke loose" many engines by using the penetrating oil and turning them over by hand with good success. But this may cause it to use some oil, break a ring, or cause more engine damage. Be careful and good luck. Hope this helps.

I would be looking at one of the idler pulleys to see if there is one bent, a bearing seized up or a flat spot warn out from not turning without resistance.

It may be. They can seize with oil in them. Unhook any belts from the engine and pull the starter free from it. If it still won't turn, it's probably seized.

what oil regulators?? only change the oil filter and oil ,their is no regulator only a pressure relief valve but thats in the oil pump ,if the injector failed ,and allowed neat fuel into the piston then this would cause the piston to seize because it wash all the oil off the cylinder bore .then seize up time