Generator Rotor Disassembly

Have you read the manual? Do you have the manual? Etc. etc.etc.

Maybe you just need a big HAMMER, who knows?

Just Google "old rotor to engine disassembly" if you don't know make, model, etc. etc.etc

What is the material of the shaft,,,and

what is the material of the pulley, ,can you heat it ,,as in oxcy/acyl

torch???

Different metals have dissimilar expansion ratios.

Work Safe

Joe in Texas

well its mouted right on the engine shaft ..no pulley,its a portable generator.Rotor is aluminium and plastic.

Is it a portable that is mounted on a taper, They usually say to loosen the through bolt and tap it on end, you may ruin the threads, I've sometimes sacrificed the ball bearing on end and hit it hard at right angle to the rotor or sometimes used a block of wood and a dead blow hammer on the laminations, but be careful, its sometimes is hard to separate the tapers.

+1 on Norton.

In my youth I worked at Generac in Wisconsin. The factory method was to loosen the thru bolt and whack with a hammer. Barbaric but effective.

I replaced the slip rings on my friend's Onan 4 kW genset in his RV. The slip rings are located behind the flywheel. It is an aluminum flywheel attached to the rotor instead of the engine. It's designed to blow the cooling air through the generator then to the engine.

Long story short: There were three untapped holes in the flywheel. I drilled the holes for 5/16 Heli-Coil to make sure the threaded connections would be strong. I then had to use a gear puller on the flywheel. I had the gear puller torqued to the hilt and had to whack the puller with a good sized ball pein hammer for several minutes, tightening the puller as I went. The flywheel was on a tapered shaft and it popped off with a vengeance. Make sure you have a safe landing place for the flywheel because this one came off and landed about 18 inches away. Scared the _ _ _ _ out of me when it went. I thought it was a standard straight shaft.

the thing is rotor is made of plastic and aluminium.iIDK what to hit .tried to fit wrenches in side nd hit on them alternatively both sides no luck tho.flwheel i know its hard and thinner than rotor.

Any chance you could post a picture of it where it attaches to the engine? Then we might be able to better identify a suitable removal method.

Thanks

I'm with Brave Sir Robin on this one. I've disassembled many different types of generators, some of them were old generator/welder type; some the newer "disposable" engine/genset for the hobby/homeowner. There is usually a place to grab the flywheel or generator frame to separate it from the engine crank by means of a puller. Sometimes you have to use the frame bolts that hold the generator/rotor end to the frame as the pulling points.

Chris

I would think Google would be your friend on this. if the engine is a name-brand, a search of model number would yield crankshaft info.

That would definitely shed a little light on the subject.

Sorry, bad pun!

I Agree with all posts re: taper shaft, most likely a copy of good old Briggs and Stratton tapershaft..... I assume this is a low-buck gen-set, is it really worth fixing?

Sometimes you need to sacrifice the component that is being replaced. - if the engine is toast, go at it from that direction. If the rotor is fried, zipwheels are a quick method of removal.

All this talk of toasted motors and fried rotors are making me think of breakfast...

Mechanics call it a "picklefork" tool used to seperate ball joints in steering gear. I disassembled an old generator with this tool. It has a wedge shape on each fork tyne that pushes the shaft off the taper of the engine shaft. A couple of hits with a 2 lb hand sledge and the genshaft separated from motor shaft.

Is the end of the rotor threaded, if it is you can try a slide Hammer

Thanks guys.whacking thing worked.i was scaring for nothing.

sorry for delay in reply .