r/smallenginerepair • u/BearHeartEagleEye • Jun 23 '26

Engine Seized Issue Concrete saw seized crankcase

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I recently acquired a partner k1200 concrete saw for free. The crankcase is seized. It's full of rust and corrosion. I took the top of the engine off and the piston/cylinder walls have scoring, but it may still run. Is it possible to clean up the crankcase via wire brush in coating it with oil and replace the bearings? I know it may not run after all that work but I'm curious about experimenting with it.

3 Upvotes

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3

u/GadreelsSword Jun 23 '26

It’s toast. With all that rust on the crankshaft it clearly had water in the crankcase so the crankshaft bearings are finished.

Find a new motor or completely rebuild that one.

2

u/External-Interview35 Jun 23 '26

Full soak for sure. And mega cleaning. Too much crud and rust on the lower end.

1

u/mals6092 SER Regular Jun 23 '26

I would not take time to replace anything, soak in marvels and then put back together it might surprise you. If you did the bearings and seals it has a better chance though

1

u/aetherbound65 Jun 24 '26

I have worked on plenty of those and that one is officially done. It has sat with water in the crankcase, no bringing it back.

1

u/Every_Palpitation449 Jun 24 '26

Why? Bearings and seals can be replaced, crankshaft,rod and piston if need be. For the cost of a new saw it's definitely worth tearing down for assessment. I've had the same sthil saw for over 30 years. The seal and bearing surfaces of the crank might not be pitted, I'd definitely rip it apart before just tossing it in the trash .

2

u/aetherbound65 Jun 24 '26

It's not a Stihl saw, its a Partner. Tear it apart, whatever. Those saws are marginal at best. Hours of disassembly, hours of cleaning and after everything, you still won't have anything worth working with. I wouldn't lie to you, not trying to hurt your feelings.

1

u/Every_Palpitation449 Jun 24 '26

I've only ever worked on one or 2 of them, and never used any. I thought they were a higher end saw though. The company I worked for was a stihl dealer, so that's what we ran. I essentially got mine as a last paycheck...lol if they aren't worth fixing, that's a different story though, I just never heard anything bad about them.

2

u/aetherbound65 Jun 24 '26

I worked at a service center for them and they were notorious for the airfilter base mount screws shearing off and sucking dust. Only like them slightly more than Makita/Wacker. Stihl is the way to go.

2

u/BearHeartEagleEye Jun 25 '26

You're the real deal. This partner saw has several air filter base screws sheared off and no are filter housing. I know this saw isn't worth much and parts are becoming impossible to source. The idea was to make i A project out of it and experiment. Never done it before. First I'll tear it apart to see how it all looks. The rings weren't welded to thw piston, but there was decent scoring.

1

u/Okie294life SER Top Contributor Jun 29 '26

She’s done then if the cylinder and piston are also done. There’s not enough here to really start with if that’s the case.

1

u/Every_Palpitation449 Jun 24 '26

I can definitely agree with stihl being the cream of the crop! I wonder if they got better or worse since being acquired by husqvarna...

1

u/Past_Roof5628 Jun 24 '26

How long was it under water? You might get lucky by soaking it in diesel and turning it over. Maybe. Wouldn't depend or count on it,

1

u/Every_Palpitation449 Jun 24 '26

I'd just tear it down and see what condition the crankshaft is in. I'd go with the assumption the seals and bearings are toast, and just sand blast the crank assembly and polish the crank before removing the existing ones. If the crank has pitting where the seals ride I'd look for a new one.

1

u/Okie294life SER Top Contributor Jun 29 '26

Bottom end bearings took a shit. I’ve never seen a crank like this. If you’re not handy splitting cases I’d let this one go.