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Crankshaft removal

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Crankshaft removal

Old 12-26-2022, 09:41 AM
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rams
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Default Crankshaft removal

I need advise on removing the crankshaft from an OS 70 Surpass. The engine has sat idle for a long time. I have everything removed from the crankcase but the crankshaft does not want to slip out of the bearings. Do I need a press? Thanks
Old 12-26-2022, 11:35 AM
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scale only 4 me
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If striped down completely,, Toss it in a oven,, say 350* for about 15-20 minutes, many times the crank will just fall out, if not just tap on it with a dead blow hammer,, a nice little tap on a 2x4 and the main bearing will fall out too
Old 12-26-2022, 01:06 PM
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J330
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Put the nut back on the crank so it's flush with the tip, and you won't risk any damage to the threads.

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Originally Posted by scale only 4 me
...say 350* for about 15-20 minutes, many times the crank will just fall out, if not just tap on it with a dead blow hammer,, a nice little tap on a 2x4 and the main bearing will fall out too
That's also a chicken dinner or baking a cake at 350F. Even a thin crust pizza falls into that range as well. I'm sure 250F will do it, although stubborn engines sometimes see a propane torch, especially if you don't want that engine taste on your bagels the next morning, 350F is a lot less than a propane flame.
Old 01-01-2023, 07:48 PM
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rams
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I tossed it in the oven and heated as directed. The crank came out with the rear bearing still attached. How do you remove this bearing from the crank?
Old 01-02-2023, 10:28 AM
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Same way,,, heat should do it,
If tapping down on the work bench when hot doesn't work,, might need to get something to wedge it loose with, I'd always try a wood wedge first

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