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I’m an idiot

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westaviation New Member Total Posts : 1 Scores: 0 Reward points: 0 Joined: 2025/06/17 17:52:26 Status: offline 2025/06/17 18:02:57 (permalink) 0 I’m an idiot I inherited an MZ5225 with a blown engine from my dad. I bought and installed a brand new HV764 engine, and after mowing for about 45 minutes, the drive belt broke. I picked up the mower with the loader of my tractor so I wouldn’t have to bend or stoop (I’m an old man) and installed the belt. When I went back to my tractor, the straps I was using broke, and the mower landed upside down, breaking off the steering handles and folding the seat back over. I turned it right side up, and after about 10 days received all the parts I needed to replace, but now the brand new engine is mostly seized. Starter won’t turn it at all, and if I put a socket and big bar on the flywheel, it is VERY difficult to turn. Could the drive belt be the issue, or did my stupidity just piss away $1500? Thanks Quote #1 1 Reply Related Threads
SRTsFZ6 Super Member Total Posts : 2298 Scores: 80 Reward points: 0 Joined: 2018/11/18 07:20:58 Status: offline Re: I’m an idiot 2025/06/18 07:10:55 (permalink) 0 Pull the spark plugs and spin over. It's very likely you have/had a hydraulic lock in the cylinder(s) causing a no crank situation. This could be either fuel or oil.... Short of it starting for a second, with liquid in one cylinder, that could bend a connecting rod. I doubt you did any damage to the engine internally. Note, check oil again (top off if necessary), after spinning the engine over (no plugs). It'll likely smoke a bunch on initial start up-Which would be normal with the circumstances. The smoke will eventually stop and you should be good to go... And DO NOT FORCE IT TO SPIN OVER- That's when you can bend stuff... . post edited by SRTsFZ6 - 2025/06/18 07:13:31 Scott Quote #2

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westaviation

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Total Posts : 1
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Joined: 2025/06/17 17:52:26
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2025/06/17 18:02:57 (permalink)

I’m an idiot

I inherited an MZ5225 with a blown engine from my dad. I bought and installed a brand new HV764 engine, and after mowing for about 45 minutes, the drive belt broke. I picked up the mower with the loader of my tractor so I wouldn’t have to bend or stoop (I’m an old man) and installed the belt. When I went back to my tractor, the straps I was using broke, and the mower landed upside down, breaking off the steering handles and folding the seat back over. I turned it right side up, and after about 10 days received all the parts I needed to replace, but now the brand new engine is mostly seized. Starter won’t turn it at all, and if I put a socket and big bar on the flywheel, it is VERY difficult to turn. Could the drive belt be the issue, or did my stupidity just piss away $1500? Thanks

Quote #1

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SRTsFZ6

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Total Posts : 2298
Scores: 80
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Joined: 2018/11/18 07:20:58
Status: offline

Re: I’m an idiot 2025/06/18 07:10:55 (permalink)

Pull the spark plugs and spin over.

It's very likely you have/had a hydraulic lock in the cylinder(s) causing a no crank situation.

This could be either fuel or oil....

Short of it starting for a second, with liquid in one cylinder, that could bend a
connecting rod. I doubt you did any damage to the engine internally.

Note, check oil again (top off if necessary), after spinning the engine over (no plugs).
It'll likely smoke a bunch on initial start up-Which would be normal with the circumstances.

The smoke will eventually stop and you should be good to go...

And DO NOT FORCE IT TO SPIN OVER- That's when you can bend stuff...

.

post edited by SRTsFZ6 - 2025/06/18 07:13:31

Scott

Quote #2

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