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Old 02-02-2011, 09:51 PM
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briggs 8hp- blown out muffler threads

Running 1 of my snowblowers today ( '71 Gilson 490A ) which has the original briggs on it.. still runs strong, altho the exhaust valve is shot, and it makes the muffler glow red inside, and at night you can see a 12" blue flame coming out of it at WOT ( will light a peice of paper ).. anyway. the muffler blew out. it has always been tight, but for some reason, the muffler blew out. threads are still there, and even look ok. except it threads in very loose, and vibrates right out.. what do I do?... after threading it in twice to just have it blow out.. I just shut it down, and pushed it back into the shed, and hit the starter on the other 1 and continued doing what I was doing...

I'm thinking of going to Lowes and getting a 1/2" NPT tap, and cleaning the threads, along with a new muffler.. just not sure that's the best idea,

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Old 02-02-2011, 10:55 PM
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Some of those mufflers were a rather loose fit- even on a relatively new engine, and some used a jam nut arrangement to secure it.

If you've used the jam nut and yours is still too loose, you might want to try a short pipe nipple to screw into the engine, then use a pipe fitting to remount the muffler. The pipe nipple may well be a tighter fit. In any event, it only costs a buck to see.

The ID of the nipple can be opened up so the exhaust has a free flow out.
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Old 02-03-2011, 09:00 AM
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I have some 1/2" fittings. I'll try that, thanks.. the muffler does have the jamb nut on it, but I didn't try tightining it up. it's seized
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Old 02-03-2011, 10:24 AM
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well, it;s 3/4". but I had 1 of those 3/4" male/female 90* bends and it fits tight, so I'll just run to the hardware when I get a chance and get the right stuff

other problem tho.. other snowblower now doesn't run intermittatly ( ran yesterday, not today ). did it before, and I took it to the shop to have the carb rebuilt as gas was running down the side ( small carbs don't work when I get done with rebuilding them ). and it was working fine.. now the carb is a little wet with gas, and it's not running again.. so I put in earplugs and ran the other 1 ( with no muffler ) to clear the little bit of snow we got overnight.. carb was rebuilt 2 weeks ago, so I don't think it's the problem. I think the gas is actually coming out above the carb.. the small engine mechanic told me he had it running and didn't think it needed a rebuild, but I told him to rebuild it anyway, after all, the machine is 35 years old ( 1972 model year Gilson 479C ) and had the original orange paint on the carb.
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Old 02-03-2011, 10:33 AM
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That carb will have a brass float, probably the 'donut' style. I have a similar carb/float on an old Bolens/FMC lawn tractor w/a 11 HP Briggs on it- the float is more solder than brass from all the pinholes it has in it!

So, if yours is running rich or leaking fuel from the carb, the first thing I would suspect is the float. Replacements are still available. The float and a needle/seat will most likely put it right. Might not even need the needle and seat.
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Old 02-03-2011, 10:54 AM
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I'd sure hope he replaced the float when he rebuilt it a few weeks ago, but that is a possibility. I'v had sunk brass floats also.. I checked the spark plug ( initially to check spark ) and the plug and chamber are bone dry, like it's not getting gas.. tho if it is dumping it out before it gets to the engine, than that would explain not running..

it usually starts on the 1st pull, with the electric start not even needed
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Old 02-03-2011, 10:56 AM
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You don't suppose there's water in the bottom of the tank that got sucked up into the carb as the tank level dropped?
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Old 02-03-2011, 11:01 AM
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Quote:
Originally Posted by cobalt327
You don't suppose there's water in the bottom of the tank that got sucked up into the carb as the tank level dropped?
Good thinking.. I'll drain it ( and the carb ) and find out. theres not much gas in it. little under a gallon ( 1.5 gallon tank, but I never fill it )
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