View Full Version : Need HELP on 17 hp Briggs I/C motor

06-23-2007, 10:58 PM
I have a 42inch cut Craftsman LT1000 with a Briggs 17 Hp I/C motor that I believe may have expired. I'll be checking tomorrow to see if the piston is moving. I was mowing and it suddenly began blowing oil smoke. I shut down and found that I had over filled the oil. But then after letting it cool, Draining oil to proper level, it wouldn't start back. I had difficulty getting it to shut off, It wanted to continue to run, even with key off and choke on. It finally shut off. One repair man told me to check the pushrods. I pulled the valve cover and watched the valves work as I cranked the motor, So I don't think it's the valves/rockers/or pushrods. I think started thinking it may be the timing key, so I started pulling the top of the motor apart, I got to the flywheel and the key that is visible, looked ok. My father-in-law checked the carb and ignition system. It gets gas and is getting fire to the plugs. So what do I check next? Where is a good source for a rebuild kit if I need to go that route? It's a 5 year old mower, but I can't afford to junk it and buy new. Any help is greatly appreciated.

Bill Kapaun
06-23-2007, 11:27 PM
Did the air filter get "oiled up" and clogged?

06-23-2007, 11:36 PM
No oil on the air filter. I had just replaced it a week earlier.

Bill Kapaun
06-24-2007, 12:33 AM
What I would do is-
Pull the spark plugs and ground the plug wire ends.
Remove air filter and open up throttle full (no choke)
Crank the engine over for 5-10 seconds and see if you blow a bunch of crud/oil out of the cylinders.
What do the plugs look like? If OK, reinstall them & wires, and try to start it.

EDIT: Forgot to ask-
HOW much did you overfill it?

06-24-2007, 12:52 AM
Probably too much. :( I'll try to get that done tomorrow as it's nearly midnight now and I'm gonna take a rest. Thanks for your help.

06-24-2007, 11:12 AM
It sounds to me like it got real hot. That can make it "run on" as you stated. Remove the blower housing and dechaff the engine with compressed air.

06-25-2007, 09:58 PM
I did some additional checking today. No oil in the Air Filter, Valves move fine, The piston still moves fine, So I'm assuming at this point that I have broken a ring and the motor needs a complete rebuild. Does anyone know a good place to purchase a rebuild kit?

06-25-2007, 10:21 PM
Try some of the great sponsors here on the forum for parts.

06-26-2007, 02:22 AM
Do A Compression Check First. If It Is Ok Its Not The Rings. Have You Tried A New Plug?

06-27-2007, 10:13 PM
clean the plug off spray some ether and itll fire right up.