Need to machine a small engine crankshaft
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Elder User
Joined: Jul 2004
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From: Long island NY
Need to machine a small engine crankshaft
Hi, I'm working on 2 generators. One has a blown engine( no oil, broken con rod, killed cyl/ crank) The other has a blown gen head. I'm trying to put the good engine on the good gen head, but the good engine has a differnt shaft. it has a solid about 1 inch shaft with large threads at the end. the required shaft has a taper on it. Can I bring a crankshaft to a machineist and have a taper machined on, or would I be better off trying to get a new crank. How much would I expect to pay for a shaft turning? All thats required is to put the correct taper in, drill one hole and put threads in it. I could even thread the hole myself.
OR i was thinking I could do some redneck engineering and run the engine and hole some sandpaper untill it got the right taper! haha!
OR i was thinking I could do some redneck engineering and run the engine and hole some sandpaper untill it got the right taper! haha!
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Elder User
Joined: Jul 2004
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From: Long island NY
The blown engine gen was a Coleman, the Good engine was a Kohler. Both engines are briggs. both around 5000 watts
Iv seen the cranks go for around 50 bucks. , and I think a machinest would be cheaper.. I'll make some calls tomorrow.
They are bolted directly to the engine, no belts.
Iv seen the cranks go for around 50 bucks. , and I think a machinest would be cheaper.. I'll make some calls tomorrow.
They are bolted directly to the engine, no belts.
Junior User
Joined: Aug 2003
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What are the rated HP on the engines? If they are 8hp or above the straight shaft is usually 1", the tapered saft is usually 30mm (the straight shaft might be too small). If you can pick up a crank for $50 you might be better off that way. Most shops around here would cahrge WAY more than that to turn it down.
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Postmaster
Joined: May 2002
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From: Broken Arrow, OK
Getting a taper turned on a crank and having a hole drilled and tapped in the end will be a bit more than $50. Don't they have couplers between the engine and generator? Lots of times you can get different coupler halves to work together.
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Elder User
Joined: Jul 2004
Posts: 715
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From: Long island NY
I pulled the crank out of the engine, the shaft is aboue 1/2 inch too short. I'm gonna look into having a adapter made that would slide over the old shaft and then have the correct length taper.
Both are 8's
Both are 8's
Last edited by RyanMiller; Apr 26, 2005 at 06:46 PM.
Laughing Gas
Joined: May 2004
Posts: 833
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From: latrobe pa
The two push mowers that i own were in my neighbors front yards for garbage pick-up,i got my tractor went down the road to each house grabed the handles and pulled them home , each one has a craftsman 4hp tech. motor,each had bent cranks,ordered the cranks and case gaskets from sears ,cost 48.00 ea plus the cost for a new blade,4 years later they still run great!
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