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Garden Tractors Discussion Forum

BRIGGS BENT SHAFT, SALVAGABLE OR TOAST?

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James Clark

03-28-2005 19:51:28




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Got a Briggs Quattro 4hp engine with a bent shaft. Looks to be about 1cm total deflection about the centerpoint (visible as I rotate the shaft by hand). Engine does run, but of course vibrates a bunch. Is this condition salvagable? All the 'official books' say don't try to fix a bent shaft, but just wondering since seems only bent a little, if it couldn't be persuaded back into line with an appropriate long pipe and a little muscle (and prayer ). Thanks, James

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cadet trooper

03-30-2005 18:33:51




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 Re: BRIGGS BENT SHAFT, SALVAGABLE OR TOAST? in reply to James Clark, 03-28-2005 19:51:28  
Jim, you said 1cm, I hope you meant 1mm, 1cm is 10mm which is about .394" which is over 3/8's (.375") of an inch that's a bunch. 1mm is .0394" approx. Just clarifying.



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chuck in Indiana

03-29-2005 14:37:48




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 Re: BRIGGS BENT SHAFT, SALVAGABLE OR TOAST? in reply to James Clark, 03-28-2005 19:51:28  
I have a c/s strightner and charge $25 if the motor is off.More if I have to remove.The one thing I usally do is replace the oil seal.They usally will leak if not replaced.



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Kent of SW MO

03-29-2005 10:55:09




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 Re: BRIGGS BENT SHAFT, SALVAGABLE OR TOAST? in reply to James Clark, 03-28-2005 19:51:28  
They say not to fix by straiten with a hammer because of liability issues. I do it all the time but I make not guarantys.

Kent



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rustyj14

03-29-2005 09:24:54




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 Re: BRIGGS BENT SHAFT, SALVAGABLE OR TOAST? in reply to James Clark, 03-28-2005 19:51:28  
Yes, with some judicious hammering, you can usually get it back near normal. But, the best thing to do is go out on the night before garbage pick-up, and get yerself a different mower! Most often, the yuppies will get their mower out of the garage, with last summers gas in it, trty to get it to run, get disgusted, and set it out for the garbage man to take it away! And, thats where i get my mowers! And usually all it takes is fresh gas, a clean-up, and away they go. But, try your hammering--it might get it close to straight! I did one, and sold it to a friend (I told him about it) who used it all one summer until it finally vibrated itself apart! by: Rustyj

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JT

03-29-2005 05:55:47




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 Re: BRIGGS BENT SHAFT, SALVAGABLE OR TOAST? in reply to James Clark, 03-28-2005 19:51:28  
From experience, here is the plus or minus of doing this.
the minus: when you bend this, you will fracture the steel and their is a very small chnce of the c/s breaking . Have not seen it very often, but have seen it once in 25 years.
The plus: as one other fellow wrote, you can do it your self, with a good heavy hammer. You do have to be careful not to go too far. It is cheaper than a new engine or mower.
Most shopd use a c/s straightener, around here, you will pay $45.00 to get the engine removed, straightened, flywheel key replace and then ususally you have to repalce the blade, it bends also.
The dowside to this, usually you can buy a used mower cheaper than doing it this way.

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Dannie

03-29-2005 02:04:28




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 Re: BRIGGS BENT SHAFT, SALVAGABLE OR TOAST? in reply to James Clark, 03-28-2005 19:51:28  
Check flywheel for cracks,you will have to remove it to replace key.If you bent shaft and did not turn key you have 1 good key.Shaft can be straighten.



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jdemaris

03-28-2005 20:19:20




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 Re: BRIGGS BENT SHAFT, SALVAGABLE OR TOAST? in reply to James Clark, 03-28-2005 19:51:28  
There's no high-tech secret to it. It's usually a ten minute job to straighten the crank. More time if the flywheel key sheared also. We did hundreds of them every summer when I worked in a power equipment shop. We had a special jig for doing the job, but rarely used it. Take the blade off, put some sort of protector on the crank, spin the crank and find which direction the bend is pointing. Mark it, and then rap it with a good sized hammer. When you're accustomed to doing it, it's easy. When doing it for the first time - be careful. Hit it "not too hard" at first, and then check the crank. If it doesn't go where you want the first time, hit it harder. It's usually easy enough to eyeball - but if you wish - use a dial indicator or lay the blade on edge on the crank and spin the engine. One warning - once the crank bends, and you straighten it - it will bend a little easier the next time you hit something. It will never be quite as strong as it was originally. On some of the landscaper's push mowers that got their cranks bent almost on a daily basis, we installed slip clutches on the blade adapter. They help a lot if you hit big rocks often.

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Bob

03-28-2005 20:00:53




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 Re: BRIGGS BENT SHAFT, SALVAGABLE OR TOAST? in reply to James Clark, 03-28-2005 19:51:28  
Small engine shops have a setup to straighten cranks. You might want to get an estimate or two, and see if you can find someone reasonable.



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