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Garden Tractors and Mowers Vintage lawn and garden tractors, mowers, snow blowers, snowmobiles and other old machinery that is driven by small air cooled engines.

Garden Tractors and Mowers

Old Briggs lawnmower engine


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  #1  
Old 08-23-2009, 05:27:41 PM
dennis1960 dennis1960 is offline
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Default Old Briggs lawnmower engine

I came accross an old Briggs and Stratton engine and was wondering if someone might be able to give me some basic info about it. The model is a 6B-H9 and the type is 900185. This engine is currently froze up and I am trying to make up my mind on whether to try selling it or just throw it away. Thanks in advance.
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  #2  
Old 08-23-2009, 07:33:27 PM
Sky
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Default Re: Old Briggs lawnmower engine

WELL

What you have there is a model 6 ball bearing horizontal cylinder. Mid to late 50's perhaps.

Depends on condition. If it's all "ratted up" i probably wouldnt fool with it but if it's in nice shape, just locked up, it's amazing what you can do with those old engines. They can be locked one minute, with a little work, free and purin' like a kittn the next.
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Old 08-23-2009, 08:15:53 PM
dennis1960 dennis1960 is offline
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Default Re: Old Briggs lawnmower engine

Thanks Sky. It looks like a good engine. It is missing the muffler and plug but all the rest is there. It had oil in it. I am thinking about putting some kerosene in the top of the cylinder and letting it soak before trying to turn it over. I have plenty of other engines that would be easier and cheaper to fix if this one has a scarred cylinder.
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Old 08-23-2009, 09:19:33 PM
dennis1960 dennis1960 is offline
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Default Re: Old Briggs lawnmower engine

I went back to the basement to soak it and noticed it is a vertical engine. Maybe someone put the wrong blower housing on? It all seems to match up. Let it soak a few minutes and it now turns over and at least the exhaust valve moves verified by sight. Also sounds like the intake valve is working. The crank does not appear to be bent. Maybe I'll check for spark. Who knows, it might actually run. I inherited it so I don't know anything about it.
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Old 08-23-2009, 09:25:16 PM
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Default Re: Old Briggs lawnmower engine

The fan shrouds between a vertical and horizontal version of the same engine interchange perfectly for the most part on most briggs i've seen, so it is quite possible its a horizontal engine shroud on a vertical motor.

Check if the flywheel is cast aluminum, if it is, don't run the motor without a blade, or some kind of large heavy pulley on the crank. The cast aluminum flywheels don't actually provide enough inertia to keep the engine running, and often cause the key to share if you don't have a blade, or something else heavy connected to the motor.
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Old 08-23-2009, 10:15:03 PM
dennis1960 dennis1960 is offline
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Default Re: Old Briggs lawnmower engine

Yep, been there done that. Felt like my arm was getting ripped off. Rope broke. Definitely need the mass to keep the engine crank going in the right direction.
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Old 08-24-2009, 02:19:24 AM
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John Newman Jr. John Newman Jr. is offline
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Default Re: Old Briggs lawnmower engine

For display running without a blade, a car disc brake rotor makes a good flywheel if you can make an adapter hub to mount it.
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Old 08-24-2009, 11:33:48 AM
gambitace71 gambitace71 is offline
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Default Re: Old Briggs lawnmower engine

hi,thats not a model 6.the model 6 and 6s were cast iron engines.those numbers show that to be an aluminum engine.
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Old 08-24-2009, 01:28:25 PM
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Default Re: Old Briggs lawnmower engine

Some particular 6 models indeed, were aluminum. 5S and 6S models, no.
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Old 08-24-2009, 06:19:51 PM
gambitace71 gambitace71 is offline
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Default Re: Old Briggs lawnmower engine

hi,i would like to see some pictures of a model 6.i have never seen one.it must be rare.thanks
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Old 08-24-2009, 06:47:56 PM
Sky
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Default Re: Old Briggs lawnmower engine

There not rare at all. You see variations of them all the time.
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Old 08-24-2009, 07:48:31 PM
gambitace71 gambitace71 is offline
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Default Re: Old Briggs lawnmower engine

i looked in my books and the straight model 6 is cast iron only.i can find 6Bs,6BH,6BHS in my books.thay are all aluminum.but the only model 6 is a cast iron engine.do you have a picture of a model 6 aluminum engine.i would like to see one.thanks
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Old 08-24-2009, 10:14:50 PM
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Default Re: Old Briggs lawnmower engine

I was stating that particular 6 models IN VARIATION which i should have said in the beginning were aluminum. I didnt mean for it to sound like THE 6 model was aluminum becouse that would be wrong. A VARIATION was aluminum, like the 6BS for instance.
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Old 08-25-2009, 06:00:04 AM
James Wallace James Wallace is offline
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Default Re: Old Briggs lawnmower engine

Sounds to me like a 6B-HS, with an i.d. tag that makes the S look like a 9. James in Wisconsin
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