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Helpful ReplyHot!20 hp Briggs

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zippy
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2017/03/23 15:41:13 (permalink)
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20 hp Briggs

This 20 hp Briggs has ran great for 12 years, used no oil, no leaks, no problems. Started the engine this week and it was running at a fast idle and after 2 or 3 minutes I heard it cough twice and engine started pulling down until it died, Tried to restart & fly wheel only moved in very tiny increments, pulled spark & same way, like possibly seized up.  Could this be a spun rod bearing? anay ideas or advice would be appreciated before I pull the engine off the mower. Thank You in advance.  zippy
Mikel1
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Re: 20 hp Briggs 2017/03/24 09:17:04 (permalink)
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Could be several things, any metal shavings in the oil? Faster idle than normal could be governor. Probably not going to know for sure until you start taking apart.
zippy
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Re: 20 hp Briggs 2017/03/25 11:16:22 (permalink)
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Mike, Thank you for reply.  I pulled the fly wheel covers and the engine seems to turn over ok with spark plug installed, using a short breaker bar & socket on fly wheel. Turn over smoothly and no noises. Pulled starter and used jumper cables & starter spins up speed. Could the starter not be putting out enough torque to turn engine? Puzzled?
Thanks 
zippy
 
Mikel1
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Re: 20 hp Briggs 2017/03/25 12:16:55 (permalink) ☄ Helpfulby LMower123 2017/04/14 09:05:19
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I would turn it over with your breaker bar a few full revolutions.
On the starter it is possible, have seen the magnets inside them come unglued and armature dig into the magnet. This makes a wobble and slows down rotation.
The starter gear did retract from flywheel gear when this happened? If it didn't it can bind up.
Flywheel magnet can also come unglued and cause it to bind.
If engine turning(above noted) is good then I would try starting it again. If it hangs up see if you can manually move it, turn it in the rotation it is going, not backwards. Hopefully this will narrow it down.
Roy
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Re: 20 hp Briggs 2017/03/25 12:24:15 (permalink)
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The engine has serious internal problems, it sounds like the connecting rod has seized on the crankshaft. It didn't 'spin a bearing', there are no bearing shells.
There are two options, rebuild which would not be economically justifiable or replace. A short block is available, all the externals from the old engine are transferred over but believe it or not a new engine is usually cheaper.
zippy
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Re: 20 hp Briggs 2017/03/25 12:30:12 (permalink)
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Thank You for the reply. I will probably not get to work on it for several days, maybe a week? Will check out the magnets & starter. Thanks again
Zippy
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