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  #1  
Old 08-16-2014, 07:57 PM
andy35321 andy35321 is online now
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Case splitting

I have a stihl ts420 that has bad bearings on crank. Has way to much play and pto side of seal is shot. I have tore down just need to take cylinder off. I done compression test before everything and it was about 130 to 140. I haven't seen damage yet. But looking through ports piston looks good. My question is are they any way to split the cases without the special tools. And getting the bearings out of case. Any help appreciated.
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Old 08-16-2014, 10:49 PM
herler herler is online now
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Small engines like that, I shortblock them anymore.
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  #3  
Old 08-17-2014, 12:08 AM
andy35321 andy35321 is online now
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Don't think shortblock is made for this concrete saw.
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Old 08-17-2014, 08:05 AM
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ilike2mow ilike2mow is offline
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Quote:
Originally Posted by andy35321 View Post
Don't think shortblock is made for this concrete saw.
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I'm pretty sure there's a short block available. Have you checked ebay?
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Old 08-17-2014, 08:19 AM
andy35321 andy35321 is online now
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Checked with my dealer and he said there wasn't. And why would I want to shortblock when all it needs is bearings on crank and new seals.
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Old 08-17-2014, 01:49 PM
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jkilov jkilov is offline
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These saws retain their price well and are usually worth saving.

Small cases like those of grass trimmers can be split by tapping on the crank (with flush nut) with a rubber mallet.

On chainsaws you can usually make a simple pushing tool and attach it to the bar studs. I've seen people pry on the flat peripherals only to break them off, so that's not a good idea.

Now on a concrete saw I guess there are no bar studs so you have to grab on something else. Professional splitting tools exist but can be pricey. Gear pullers can be problematic since there's often not enough material to bite on where the jaws are located.

Personally I would try from the flywheel side by making a thick L profile you can attach to the two near-side cylinder bolt holes as this is a very strong attachment point. The other end should have a tapped hole so you can force a bolt against the crank. Use your imagination and try your best.

There's no quick way to do this if you don't have the special tools required.

Anyway the parts you'll need are:
- 9503 003 0351, crankcase bearing
- 9630 951 1696, PTO oil seal
- 4238 029 0500, case gasket

And while you're at it, I would also replace:
- 9503 003 0351, the other side bearing, same part
- 9640 003 1570, flywheel side oil seal
- 4238 029 2300, cylinder gasket

Good luck
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Old 08-17-2014, 06:22 PM
andy35321 andy35321 is online now
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Got case split by threading on nut and tapping with brass hammer. Got crank out. Just kept tapping and it split. The crank on pto side has little wear on counterbalance. I guess where the bearings came apart and rubbed it. Guess gonna have to put crankshaft. I'm just gonna do a full rebuild. Piston has a place toward bottom of skirt I can feel and the oil lines on piston can't see too much. Also the cylinder has small score on bottom of skirt area of piston.Wish I could find shortblock. Would be a lot easier. Need to get the bearing that looks ok out of case so I can put new one. Don't wont to do twice. Would you just heat case around bearing then tap it out with socket.
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Old 08-17-2014, 08:19 PM
andy35321 andy35321 is online now
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need to get this bearing out

inside of bearing went against counterbalance

damage it done

little score mark on piston from bearing I guess

heres other side

inside cylinder little score mark what would you do
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Old 08-18-2014, 07:24 AM
herler herler is online now
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Quote:
Originally Posted by andy35321 View Post
Checked with my dealer and he said there wasn't. And why would I want to shortblock when all it needs is bearings on crank and new seals.
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Because unless you really know wth you're doing by the time you're done paying for parts and labor it would have cost as much to just throw a whole engine in there and chances are good it would have been cheaper. Was trying to save you a headache, but then it seems we all have to go through this experience at least once.

And maybe they don't make a shortblock, thou the dealer isn't my first resort either.

Quote:
Originally Posted by andy35321 View Post
little score mark on piston from bearing I guess
Yup, here we go, guessing.

Quote:
Originally Posted by andy35321 View Post
inside cylinder little score mark what would you do
I told you, I would have shortblocked it.
No guessing as to what to do.

Last edited by herler; 08-18-2014 at 07:30 AM.
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  #10  
Old 08-18-2014, 09:19 AM
andy35321 andy35321 is online now
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I gave up a lot of work to rebuild stuff. Also could make pretty good money at it. Not no more. You will never learn if you don't try. I know how to do it. Just come on here for the more experienced help like Jeffinalabama piston slapper and dutch1 and bigfish also restrorob. Can't forget him. Tigerrepair is pretty awesome too.
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