removing an awkward flywheel

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spro
Posts: 6803
Joined: Mon Feb 20, 2006 11:04 pm
Location: mid atlantic

removing an awkward flywheel

Postby spro » Sun Dec 03, 2017 5:53 am

The engine is only 8 hp. It is a 19D Briggs & Stratton with the heavy flywheel. The initial attempt to remove it, was the two bolts close to the shaft. One bolt broke flush into the flywheel. An attempt to drill through that bolt allowed the drill bit to wander and it broke. The drill end was picked out.There is still mess to secure a pull close to the tapered end of the crankshaft. He has tried heat and various outside pullers ( would have to have jaws expanding over 9 1/2") and then coming behind the flywheel. It is all one piece. I know that 9 1/2" doesn't seem much but there isn't any space for thick jaws to get around it.
Dang. The way is, to weld into the broken stud and pull from the center. Same deal but heavier. Tapered shaft, been on there 50 years.
Questions: and answers maybe. While welding the stud there will be so much concentrated heat close to the shaft, it may release. The ground or return must be placed close to the electrode, for it may try to weld the shaft. It would certainly excite it :)
At this point, he has heated the flywheel and used all manners of penetrant.
Yes questions and Answers

John Hasler
Posts: 360
Joined: Tue Dec 06, 2016 4:05 pm
Location: Elmwood, Wisconsin

Re: removing an awkward flywheel

Postby John Hasler » Sun Dec 03, 2017 9:02 am

Fabricate a really stout puller and then use an impact wrench? How big are those studs?

spro
Posts: 6803
Joined: Mon Feb 20, 2006 11:04 pm
Location: mid atlantic

Re: removing an awkward flywheel

Postby spro » Sun Dec 03, 2017 5:30 pm

The original stud holes are 5/16 X18 tpi. He used higher grade, shoulder bolts. If the flywheel was off of the engine, repair would be easy. It is soaking upright with Kroil now. He has a brake drum puller applying tension.

spro
Posts: 6803
Joined: Mon Feb 20, 2006 11:04 pm
Location: mid atlantic

Re: removing an awkward flywheel

Postby spro » Wed Dec 13, 2017 3:39 am

I am somewhat embarrassed for even posting about this engine. It is one of those little things which perhaps, doomed that design. The "key" was external, bearing within the key slot used for drive pulley. The taper within the heavy flywheel may have moved, creating a scored locking surface. This needs raw power to remove closer to the center. Forget 5/16 X 18 . Those days are over but a fixture could be assembled to guide an end mill. It will require both locations milled through, to at least , a thread of 3/8 X 16 can be threaded into the iron.

spro
Posts: 6803
Joined: Mon Feb 20, 2006 11:04 pm
Location: mid atlantic

Re: removing an awkward flywheel

Postby spro » Wed Dec 13, 2017 4:04 am

I'm not there. The same design of the puller could be the guide. This is awkward stupid compared to larger engines of more importance but is the correct engine for a certain small tractor.
Sure. Bring the engine to a milling machine. There are metal guards which cannot be removed until the flywheel is off. Fixturing this thing dead on the table.. supporting behind a flywheel with 3/16" clearance.. wasn't the way.


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