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  1. #41
    blackgold12 started this thread.
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    Quote Originally Posted by hills View Post
    Those ones are nice ! Entirely different procedure with the flex plates.

    All i've ever worked with are the consumer grade machines. You can whack on the rotor with a sledge and a block of wood w/o damaging it but it's a rough way of doing things.

    As i mentioned before, i picked up a couple of generators last week. I went at the Powermate 5500 first. Dug into it and it turned out that the piston & cylinder wall was damaged. The gen head seems to be okay so salvaging that for re-use was the task of the day today. I could repower it with a brand new 10 HP Tecumseh for under 200.00$ though i would prefer to source a used motor locally if possible.

    Gonna take a look at the Generac tomorrow. Hoping for the best.
    IMO finding a good used 10 horse power Tecumseh generator engine is no easy task, you might have to swap the crankshaft from your damaged engine into the new one so you have the tapered shaft for the armature to fit onto.

    Couple hundred dollars for a new generator engine from Sears with warranty, money well spent.



    https://www.sears.com/search=10%20HP%20Tecumseh%20%20generator%20engine





    Last edited by blackgold12; 11-21-2019 at 08:39 PM.


  2. #42
    hills's Avatar
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    That's a nice looking motor BG. I did manage to locate a brand new 10 hp Tecumseh generator motor on line for under 200.00$ with shipping included. I have that same model Tecumseh engine in 8HP version on one of my other generators. It's held up reasonably well over the years. Just not as fuel efficient as the OHV B&S or a Honda.

    As far as i know, almost all of the smaller generator engines have the same shaft taper. Most of the generator heads are compatible with that taper. It's not too much of a problem to mix and match. That particular taper is called SAE J609A.

    I had a 9hp.6 kw.diesel unit that i bought new a number of years ago. Really liked that machine but it was Chinese made and didn't hold up. The exciter coil on the gen head failed after 125 hours. The output shaft on the diesel had an oddball taper and i never could seem to find a replacement gen head that would be compatible. The motor is still sitting in the shop. There's no telling. There's still quite a bit i don't know. I might run across a compatible gen head some day and get the old work horse running again.
    Last edited by hills; 11-21-2019 at 10:10 PM.

  3. #43
    blackgold12 started this thread.
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    Quote Originally Posted by hills View Post
    That's a nice looking motor BG. I did manage to locate a brand new 10 hp Tecumseh generator motor on line for under 200.00$ with shipping included. I have that same model Tecumseh engine in 8HP version on one of my other generators. It's held up reasonably well over the years. Just not as fuel efficient as the OHV B&S or a Honda.

    As far as i know, almost all of the smaller generator engines have the same shaft taper. Most of the generator heads are compatible with that taper. It's not too much of a problem to mix and match. That particular taper is called SAE J609A.

    I had a 9hp.6 kw.diesel unit that i bought new a number of years ago. Really liked that machine but it was Chinese made and didn't hold up. The exciter coil on the gen head failed after 125 hours. The output shaft on the diesel had an oddball taper and i never could seem to find a replacement gen head that would be compatible. The motor is still sitting in the shop. There's no telling. There's still quite a bit i don't know. I might run across a compatible gen head some day and get the old work horse running again.
    Don't assume anything about crankshaft tapers used for generator armatures being the same, I know for a fact Onan uses different taper on their RV gen sets.

    Maybe its possible the Chinese copied the Onan taper.

  4. #44
    hills's Avatar
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    You're quite right about not assuming shaft tapers. Though less common ... there's a J609B. There are also a few other exotic tapers but it's hard to find the exact specs on those ones

    The diesel i've got is said to be a Yanmar clone made by a company called Liquid Combustion Technologies -or- LCT. Odd for a diesel ... this one spins at 3600 rpm. It's pretty loud, and you do get an exhaust smell in the area, but it does the job. It handles sudden surges, like the water pump kicking on, with ease.

    It's a shame with Onan. They were incredibly well built machines that were designed to run for the long haul. Strictly for sentimental reasons ... i picked up an almost new 1500 watt / 110 volt Onan generator head that was designed to run as belt driven off the PTO of a tractor. It was all i could do to pick it up. Maybe 100 - 120 lbs. Compare that to the little tailgaters of about the same output you pick up at Big Box these days.

    It was never the same after Cummins bought out Onan back in the 90's. The supply of repair parts for the old gensets gradually started to dry up. The old time technicians that knew how to work on them aged out and retired from the trade. There was an excellent website dedicated to the repair of the old Onans but that one shut down and the knowledge base was lost after the owner lost interest awhile back.

    Sometimes you just have to move forward i guess. You can still buy a quality built machine that's built for the long haul but they are expensive. Seems like that vast majority of generators i've run into are consumer grade. It would be pretty kool if most of the small gas engines could go to fuel injection. That might be a big step up for emissions and fuel economy.

  5. #45
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    Thats 2 great ideas of how to remove a Bronze bush from a dead end hole.
    I knew already from older motorbike books, but we got taught at Polytec anyway, how to move them out using a machined shafting & grease & a hammer. Using tapered wood would be a quicker setup & usable if you didnt have a metal lathe about.
    The 'grease & Zerk ( lol, its not a word we use here, its just called a grease nipple, but I'm warming to a Zerk fitting ) fittings ' ideas extra good if you have the machinery & dont want to risk any damage at all.

    Dad had a Lincon welder/240 V AC generator setup on a trailer with a Wisconsin 2 cylinder hand crank start, petrol motor for site work.
    He could start it easily, it scared the s--- outta anybody else.

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  7. #46
    blackgold12 started this thread.
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    Quote Originally Posted by hills View Post
    You're quite right about not assuming shaft tapers. Though less common ... there's a J609B. There are also a few other exotic tapers but it's hard to find the exact specs on those ones

    The diesel i've got is said to be a Yanmar clone made by a company called Liquid Combustion Technologies -or- LCT. Odd for a diesel ... this one spins at 3600 rpm. It's pretty loud, and you do get an exhaust smell in the area, but it does the job. It handles sudden surges, like the water pump kicking on, with ease.

    It's a shame with Onan. They were incredibly well built machines that were designed to run for the long haul. Strictly for sentimental reasons ... i picked up an almost new 1500 watt / 110 volt Onan generator head that was designed to run as belt driven off the PTO of a tractor. It was all i could do to pick it up. Maybe 100 - 120 lbs. Compare that to the little tailgaters of about the same output you pick up at Big Box these days.

    It was never the same after Cummins bought out Onan back in the 90's. The supply of repair parts for the old gensets gradually started to dry up. The old time technicians that knew how to work on them aged out and retired from the trade. There was an excellent website dedicated to the repair of the old Onans but that one shut down and the knowledge base was lost after the owner lost interest awhile back.

    Sometimes you just have to move forward i guess. You can still buy a quality built machine that's built for the long haul but they are expensive. Seems like that vast majority of generators i've run into are consumer grade. It would be pretty kool if most of the small gas engines could go to fuel injection. That might be a big step up for emissions and fuel economy.
    Hills search for the appropriate kilowatt two bearing generator to suit your Yanmar clone's horse power then with one of these adapters you'll be able to put your diesel engine back to work.

    Either direct couple using a love joy or via belts.





    Last edited by blackgold12; 11-22-2019 at 02:06 PM.

  8. #47
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    The basic idea is pretty good but unfortunately no go on the J609B taper. The thing is that it got me searching for the right shaft taper again and i stumbled upon this.

    https://www.amazon.com/dp/B0051C3DTM/?tag=uzmnpf8nvp-20

    The taper in figure two is very close to the one on my diesel. About the only difference is that the length from the bevel to the tip is about 98.5mm and not 75mm as shown in the drawing.

    It's a good day. I learned something new. It's a Chinese taper and i should be looking in metrics not SAE standard tapers. Gettin' closer.

  9. #48
    blackgold12 started this thread.
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    Hills when you have time post a picture of your Yanmar clone crankshaft taper.



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