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Bosch generator with sachs two stroke


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  #1  
Old 12-08-2018, 11:19:31 AM
timbo917 timbo917 is offline
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Default Bosch generator with sachs two stroke

Hello,

I have a Bosch generator set powred by a sachs 273cc engine.
Now the engine is not that good anymore and I would like to change it for a
briggs engine. I have been trying to separate the engine from the generator but
it has me puzzled. The crankshaft of the engine slides in the shaft of the generator. The bolts that hold the two together are on the inside of the generator front flange. So you can't access them. So I took the generator appart to see if I could reach them from there but the cooling fan is in the way.
Somebody got an idea?
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  #2  
Old 12-08-2018, 02:46:42 PM
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John Newman, Jr. John Newman, Jr. is offline
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Default Re: Bosch generator with sachs two stroke

The normal method of connecting the engine crankshaft to the generator rotor is with a long bolt through the center of the generator rotor that screws into the end of the crankshaft. The rotor fits on the crankshaft with a tapered connector. You need to remove the through bolt and then get the rotor separated from the crankshaft. This may come apart easily and it may not...
Generally a soft face mallet strike to the rotor laminations will get the two to separate. If the connection is rusted, it may take more effort to separate them. Do not damage the rotor laminations.
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Old 12-08-2018, 05:01:17 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Bosch generator with sachs two stroke

What is wrong with the 2 stroke? Depending on the generator, you may end up with a voltage/current ripple as you are reducing the number of power strokes by 1/2.
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Old 12-09-2018, 05:47:17 AM
timbo917 timbo917 is offline
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Default Re: Bosch generator with sachs two stroke

Hey John,thanks for the tip. There is a bolt head on the end of the rotor. I tought it held the rear bearing in place. I wil give it a try this evening. The engine is worn out so I would like to replace it with a 4 stroke. How can I tell this would be a problem with the generator?

Tim
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Old 12-09-2018, 12:53:41 PM
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Default Re: Bosch generator with sachs two stroke

Is this unit 50 Hz or 60 Hz?
Second, is it 3000/3600 RPM (50/60Hz)?
Or is it 1500/1800 RPM (50/60 Hz)?
If it is the lower speed, then going to a 4-stroke engine might require a larger engine than necessary due to the reduced HP available at the lower RPM. This could also cause flickering of lights as the time between power pulses is greater.
If it is a higher speed unit, then I don't see any problems with changing to a 4-stroke engine. You will need an engine with a tapered crankshaft end to mate with the generator.
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Old 12-09-2018, 01:13:00 PM
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Default Re: Bosch generator with sachs two stroke

Hello,

It is a 3000 rpm 50 hz.
The generator is a 5KVA unit. I have a 11 HP briggs.
Normaly that should be more than enough,somebody told me the sachs engine is was 8 or 9 HP;
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Old 12-09-2018, 03:44:14 PM
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Default Re: Bosch generator with sachs two stroke

Success,got them appart.
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Old 12-09-2018, 04:31:55 PM
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Default Re: Bosch generator with sachs two stroke

Good!
General practice is to have 2 HP of engine for each 1000 Watts of generator. Your 11 HP engine should be good for 5500 watts.
Let us know how things work out and include pictures. We like pictures!
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Old 12-09-2018, 05:02:38 PM
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Default Re: Bosch generator with sachs two stroke

The generator won't be a direct fit to the briggs engine.
I wil have to do some machining to fit a front bearing in the generator flange.
I was thinking to use the kind of coupling that you sometimes see connecting electromotor and pump. Don't know how its named. Wil post some pics in the future.
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Old 12-09-2018, 05:33:33 PM
Vanman Vanman is offline
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Default Re: Bosch generator with sachs two stroke

The Sachs engine is not rebuildable? To me that Two Stroke is the interesting part of the set. There are already oodles of run of the mill Briggs powered sets, screaming along at 3600 or 3000 rpm.

Otherwise, I'd be inclined to make the generator belt drive, to get the engine speed down to something pleasant. Here I have a Wisconsin engine running 2400 rpm. https://m.youtube.com/watch?v=6hvpFM8-qiU
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