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Help, died in middle of snow plowing and am paniced

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Rich

11-29-2001 10:47:06

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48 8N front dist 12 volt all elect in excellent shape
clean bright & tight, new points set correctly, static timed
with 1/4" to start opening, perfect blue full spark at new plugs, all wires correctly connected to dist, carb is rebuilt correctly with all new parts with very good fuel flow of fresh gas, good vacuum at carb when hand is placed over carb inlet. good compression when finger is placed over open spark plug hole, sharp rush of warm air dislodges finger
not tested with comp gauge as I can't find mine (Looked all OVER for it) gas tends to leak out of sintered bronze
drain in carb bottom after cranking with choke or hand over the inlet but absolutely ZERO firing. Pulled governor and inspected the timing gear, fiber gear teeth all look PERFECT
no damage to any of them.

Tractor was pushing a medium sized load of show on hiway and suddenly died with out a warning and nothing I have tried has gotten any results for even a minor bit of starting. Cars coming and there I am in the middle of road, used starter to raise back blade and pushed it by hand 1000 feet to garage but can't get it to the real shop as it is not plowed to that point yet

I am thinking it is somehow timing gear related but the perfect teeth have me baffled as to how it could be so far off as to not even give a puff of a start as well as giving
vacuum and compression plugs appear dry as if gas is not getting to them but the vacuum is strong pulling up the gas.

what the heck is up? HELP!!!!

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Norman

12-01-2001 16:34:39

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Re: Help, died in middle of snow plowing and am paniced in reply to Rich, 11-29-2001 10:47:06

In your case, I would try spraying starter fluid in the carb and try starting it. If whe fires up you arent getting gas out of the carb. Could be a chunk of dirt plugged the needle valve opening, or more likely, the needle valve stuck shut. Sometimes a gentle tap on the carb will loosen the needle valve to pop it loose from the seat, and allow fuel to flow into the float bowl again.

Good luck.

Norman

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Erbie

11-29-2001 18:04:19

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Re: Help, died in middle of snow plowing and am paniced in reply to Rich, 11-29-2001 10:47:06

I'm not sure if you got the old girl running again yet, but it sounds painfully similar to the scenario I went through last winter. I found that these 8N's with gravity feed, updraft carburators do flood easy - especially under load. I got in the habit of nearly jumping off the thing when it stalled to turn off the fuel flow. I figure it was generating a lot of vacuum with the load of snow I was rear blading. When it stalls all that fuel it's sucking ends up at the lowest point - the carb and your sintered drain. After dry time it starts up again. Since then, I've backed out the power needle on the carburator 1/2 turn to richen the mix. She hasn't even thought about stalling since.

Also found a problem at the distributor. The bottom drain also allows packed snow, or fan blade driven snow, to get inside too. I keep a dish towel in the dash tool bin for quick field drying. Be careful though. When putting my distributor cap back on, I managed to bend the rotor's spring contact - effectively eliminating all spark. After a week of "fixing" everything else that had to be wrong, I re-checked the cap to my surprise. Re-checks never hurt, I guess.

Just some food for thought.

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Larry 8N75381

11-29-2001 13:00:27

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Re: Help, died in middle of snow plowing and am paniced in reply to Rich, 11-29-2001 10:47:06

I don't like your comment, "gas tends to leak out of sintered bronze drain in carb bottom." These 4 cyl. flat head engines like to flood at the drop of a hat!!! Once flooded, they (mine at least) are impossible to start. I have to take loose the air intake to let it "dry out." Since it is cold, you will have a tendancy to flood even easier.

I'd open up the air intake to carb and let it sit for a day. Close it back up and try the eather.

My $0.02
Larry

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Bill

11-29-2001 11:27:55

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Re: Help, died in middle of snow plowing and am paniced in reply to Rich, 11-29-2001 10:47:06

Spray ether into the carb and see if it starts or first pop the plugs spray ether into the cylinders, replace plugs and fire it up.

If it doesn't fire up with starting fluid, then it's a spark problem. Check your distributor for possible disconnect or short circuit. Sometimes points just go bad but your blue spark baffles me too. Check your switch for a short or loose wire or connection.

If it's fuel related, check for water/condensation and put dry gas in it. A sudden shutdown is fuel related or a disconnect in the wiring. so check for debris settling into the line or obstrucitng a jet. etc. Could be condensation and ice particle that could easily jam things up. Always good to take carb off and clean all jets with compressed air and a needle, check float and main needles. be thorough look for the paper insulator in the distributor to see if its in place. check the distributor cap for condensation and that the contacts and rotor in there are clean.

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ED-Illinois

11-29-2001 11:17:54

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Re: Help, died in middle of snow plowing and am paniced in reply to Rich, 11-29-2001 10:47:06

Is it possible that some Ice is in your carb - sounds like everything else is in order. Try warming it with a hair dryer. Also, were the plugs wet? Maybe flooding is the problem?

Good Luck - I got stuck on the highway once with a dead battery at 4:30 am and snow allaround the tractor- not good!

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Greg

11-29-2001 11:15:33

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Re: Help, died in middle of snow plowing and am paniced in reply to Rich, 11-29-2001 10:47:06

Rich,
If you have spark and fuel at the correct time it's gotta run. Sounds like you got the spark, are you positive all that good vacumn is pulling gas up into the cylinders? If your plugs look real dry, as you say they do, I'd look further at the carb. JMHO

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