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Splitting a Stihl 034 Chainsaw Crankcase

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Pabst

11-17-2002 16:59:09




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I am rebuilding a stihl 034 chainsaw, and I have the engine completely off the frame, but I am having difficulty splitting the crankcase. Does anyone have any ideas on how to split it. Thanks a lot.




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stihltech

11-19-2002 14:45:10




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 Re: Splitting a Stihl 034 Chainsaw Crankcase in reply to Pabst, 11-17-2002 16:59:09  
Yes, there is a special tool, but it is not necessary. Make sure all screws (6) and pins (2) are out of case. Warm the case on a hotplate. When good and warm to touch, use a propane torch and keep it moving on case around crank bearing for a couple of minutes. Use a dead blow hamer( NOT METAL!) to force crank out of case. Do the same to both sides. If the bearing stays in the case, warm it again and use a good fitting socket on the outer race to remove it.
To reassemble, install bearings on crank (warm helps here too, but watch those plastic races!). Warm the case again. The crank and bearing should slide into the case. You may want to insatll the oil pump first, as it sets the depth of the bearing on the clutch side. Repeat on the flywhell side. Do not forget the gasket. Hold it in place with the pins sticking out slightly.
While warm, install the bolts and tighten. If the crank does not spin freely, us a center punch and tap on each end of the crank until it does. If it doesn't move by tapping, warm it up and try again.
Used this method in the shop for the first ten years, still use it if I don't have the correct tool.

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Russ

11-17-2002 18:00:21




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 Re: Splitting a Stihl 034 Chainsaw Crankcase in reply to Pabst, 11-17-2002 16:59:09  
You need a special tool that resembles a deep throat c clamp but the base is split per se to go on either side of the crank inside the crankcase, and the forcing screw has a tapered end to index in the end of the crank. Does that make sense? Maybe you could give a small engine guy a few bucks to split it for you since this tool is expensive. Russ



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