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Garden Tractors Discussion Forum

5hp Briggs Quantam woes

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railhead

07-16-2007 05:14:39




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I have a 5hp BS engine on a push mower. This has never been a real good running engine. Hit a big clump of grass Sat and shut it down for good. Yest took covers off and saw flywheel shear key cut in two. Pulled flywheel, replaced key. put back together now it will not run PERIOD. Key is nice and straight now. I have Good fire at plug, have fuel getting in carb, I pulled till I was give out and it wil not run. Ether shot in the carb, no run. Could the shaft be bent? I imagine the flywheel key was sheared a little before and it was running, the big clump of grass finished it off. This little engine seems awfully cheap...(throw away) to me. I was hoping to make it through the summer with it though.

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lucasss

07-18-2007 06:41:57




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 Re: 5hp Briggs Quantam woes in reply to railhead, 07-16-2007 05:14:39  
i put rings and valve job in my quantum5hp and it ran better than it ever did new.. mower frame was still good is why i did it,ball bearing wheels. parts were only abou 45.00 . lucas



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joe csuti

07-16-2007 05:36:50




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 Re: 5hp Briggs Quantam woes in reply to railhead, 07-16-2007 05:14:39  
Pull head & check if piston moving up & down,you may have a broken con rod,also check for a stuck open valve(s) or a blown head gasket.



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JayWalt

07-16-2007 05:23:12




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 Re: 5hp Briggs Quantam woes in reply to railhead, 07-16-2007 05:14:39  
i would hook a compression gauge up to it, make sure the vavles are timed right with the crank. Also check the magnet on the flywheel, it should line up with the magneto when the piston is at tdc on the compression stroke.



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railhead

07-16-2007 18:19:34




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 UPDATE in reply to JayWalt, 07-16-2007 05:23:12  
Well today when I goit in from work I pulled the plug out to look for comp and there was very little. Stuck a piece of wire in the plug hole while turning the flywheel and the piston was travelling, pulled the head and the valve seat on the intake valve had came out, dropped around the intake valve and was holding it open. I looked it over and it wasn't cracked or broke so I put it back in the seat and tapped the valve and all back in with a small piece of wood and small hammer. Assembled engine and it fired first pull.

Now for the 64 dollar question.....WILL IT STAY IN?????

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rustyj14

07-16-2007 19:34:23




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 Re: UPDATE in reply to railhead, 07-16-2007 18:19:34  
In answer to your question: "Will it stay in?". Probably not, unless--here's the best part: There is a type of glue, for want of a better name, that you can use to seat the seat. Then, using a center punch and a medium hammer, set the seat back in place, then go around the seat, about 1/8 inch away from the edge of the seat, and make a complete circle around the seat, in the block, making indentations with the center punch and the hammer, and about 3/16 inch apart,which swells the aluminum around the seat, and which should hold it in place, and the glue, when set over night, should keep the seat in place! I did one a month ago, and it is still holding. Now, if all else fails, you can drill a hole to take a small screw and washer, which when the washer sticks over the seat, and you do both sides, that will really keep it in place! The latter is done only in desperation. If you plot your course, you can miss the screws when putting the head back on. Of, if they still hit the head, then grind them down until they clear, and there is enough metal to hold! I'll admit, i have used some unorthodox means of repairing things, but they work! They don't call me "Tricky Jim" for nothing!

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