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Red Hot Exhaust on 8N.

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Ron-TX

07-04-2003 19:44:06




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Changed Points, Condenser, and plugs.(Front mount distributor) Also replaced carb. Now power doesn't seem up to snuff, and I notice this evening, while test driving, that the Exhaust manifold and tail pipe were red hot. Exhaust manifold almost got white hot before I could get back to the barn and turn it off. I double checked the points setting and timing before the test drive, and they were set according to the FO manual. As was the Carb. What am I missing? I never noticed this before and I have had my 8N for 3 years. Any help would be appreciated. Thanks in advance.

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Rob

07-05-2003 04:07:01




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 Re: Red Hot Exhaust on 8N. in reply to Ron-TX, 07-04-2003 19:44:06  
There is a quick test you can do from the seat. Warm the tractor to normal operating temp. If it won’t warm up or maintain a constant operating temp then the tstat may be wacked.
Put the tractor in high gear and get her just rolling forward a little bit and at idle and then quickly pull the throttle to 1/2 speed. Do this with your good brake partially on. You want a heavy load on the engine as you give it a lot of gas in high gear. You want to make it pull really hard. If the clutch slips then you’ll have to adjust or replace it.
1. If it backfires the fuel mix is too lean or you have a shorted ignition (pull the spark plug wires one at a time and watch for a regular spark without a miss) or sticky valves (you can hear a sticky valve).
2. Your timing is ok if you hear a constant slight pinging (spark knock). 3. If it doesn't ping set the timing and make sure the mechanical advance is free to operate. I hear that if the wrong screw is used on the points it can interfere with the mechanical advance weights. 4. If it pings excessively then set the timing. If that doesn’t correct the pinging then pull all the plugs, clean em up, and set the gap. While you have them out take a compression test on each cylinder with the carb throttle full open. You are looking for 90psi minimum at starter cranking speed. If you get normal compression then you need to check and set that timing! If you have 140+psi pull the head and clean the carbon off it. Make sure the valve stems are not gummy. Low compression says ‘fix my guts’ or it’s a new rebuild that isn’t broken in yet.
5. If the engine pulls evenly and there is no indication of late spark or excessive carbon, check the system for a lean mixture.
6. If the engine pulls unevenly then check the spark at the spark plug boots.

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Salmoneye

07-05-2003 04:05:31




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 Re: Red Hot Exhaust on 8N. in reply to Ron-TX, 07-04-2003 19:44:06  
Red hot in the dark is normal...Should glow after working hard...

However, excessive heat can mean you are running too lean or that you are firing too late and some gas is burning in the manifold...

Try enrichening a bit first...if that doesn't do it reset to prior carb setting and try advanceing the spark a tad...

Just a guess...More betterer answers will come I assume...



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