Half stuck engine

Alysha

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Alright...
I’m going crazy. I had a fuel float issue and had gas mixing with my oil. Fixed the issue, cleaned the oil out, and ran it for a few seconds to burn the rest out and turned the mower off. I added fresh oil and when I go to start it, it will click and try and turn but won’t move. I can manually turn it halfway backwards and half way forwards and when I go go as far as it will let me I hear a loud bang - like metal on metal. I have tried manually turning it and it won’t budge. Just clank, clank, clank. Did I seize my engine? I tried the PB blaster trick and it did nothing. Any insight?
 

slomo

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Is the deck choked with barbed wire or a log chain? Did you WALK the yard prior to mowing?

Remove the spark plug/s. Rotate the blade/s by hand. Engine should turn over easy.

slomo
 

Alysha

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Is the deck choked with barbed wire or a log chain? Did you WALK the yard prior to mowing?

Remove the spark plug/s. Rotate the blade/s by hand. Engine should turn over easy.

slomo

I didn’t start mowing - it was sitting idle.

It’s a riding lawn mower so I tried spinning the wheel that attaches to the engine and spins the blades - sorry drawing a blank on correct terminology. It won’t budge. Does the same as if I spin the engine.
 

ILENGINE

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So the sequence of events was fix the carb, drain the oil, start engine without oil, shut off and then added oil, but now won't make a full engine rotation. If you started the engine without oil even for a few seconds can cause serious engine damage, and if I have the sequence correct the engine has a broken rod in which the crankshaft is jamming on the broken pieces inside the engine.
 

bertsmobile1

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Take the spark plug out and see if you can rotate the engine by hand
Either by pressing down on the debris scree or with a wrench on the bolt under the pulley
 

Scrubcadet10

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I would try what bert said, but i think Ilengine may have hit the nail on the head.
 

Alysha

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So the sequence of events was fix the carb, drain the oil, start engine without oil, shut off and then added oil, but now won't make a full engine rotation. If you started the engine without oil even for a few seconds can cause serious engine damage, and if I have the sequence correct the engine has a broken rod in which the crankshaft is jamming on the broken pieces inside the engine.

Unfortunately this sounds like what happened. I tried the remove the spark plug and turn it by hand trick and it hitting something metal and won’t budge. Sounds like it’s hitting a rod like you said. Thanks!
 

slomo

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Guess I missed the part where the engine was ran with no oil. Is this the case here?

Wait, is this a new Briggs engine sales gimmick again? Now we don't need oil at all?

slomo
 

Scrubcadet10

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Guess I missed the part where the engine was ran with no oil. Is this the case here?



slomo
Alright...
. Fixed the issue, cleaned the oil out, and ran it for a few seconds to burn the rest out and turned the mower off. I added fresh oil and when I go to start it, it will click and try and turn but won’t move. I can manually turn it halfway backwards and half way forwards and when I go go as far as it will let me I hear a loud bang - like metal on metal. I have tried manually turning it and it won’t budge. Just clank, clank, clank. Did I seize my engine? I tried the PB blaster trick and it did nothing. Any insight?
;)
 
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