Question about Craftsman 20 Hp 42" Deck Lawn Tractor

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

The oil pump broke off inside the engine and caused the engine to seize up. This tractor has had less than 75 hrs. use.

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With only 75 hrs isnt it still under warrenty

Posted on Oct 17, 2008


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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.

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A seized engine is always caused by a lack of lubrication, which could be caused by an insufficient quantity of oil, low oil pressure or contaminents in the oil. I once started an engine that was supposedly seized, and drove a mile to aplce I could work on it. In that case it was a thrown piston rod. I ended up replacing the engine with one from a auto salvage yard. It was faster, and less expensive than rebuilding the engine.

A new short block could solve the problem, but whatever caused the engine to seize may have damages the heads or the valve train. In that case a "long block" would be needed. These are expensive, so, I would look into a used enine from a reputable source

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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?

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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.

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