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Harry Ferguson Tractors Discussion Forum
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Engine miss above idle

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Ernest Lipps

10-08-2004 18:01:30




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I have an erratic engine miss on my TE20 thats driving me crazy. runs fine when cold after engine warms up will slowly start to miss above idle but still comes and goes return to idle and smooths out. Start to speed back up and soon starts erratic running once again. Just replaced coil with NAPA IC14 12 volt but did not help. Anyone have an idea as to what may be causing this fuel seems okay can remove drain screw from bottom of carb and fuel flows very freely. Ernest

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John (UK)

10-10-2004 12:05:06




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 Re: Engine miss above idle in reply to Ernest Lipps, 10-08-2004 18:01:30  
Just to make sure that the engine is timed correctly now, it should be firing at TDC on that engine. With the points set to .010" - .012"



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txblu

10-09-2004 06:52:54




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 Re: Engine miss above idle in reply to Ernest Lipps, 10-08-2004 18:01:30  
If you have a Marvel-Schiebler carb, get a manual to set it up. There is an air valve and the normal idle valve. There is no "high speed FUEL metering control" normally found in a carb.

The air valve operates exactly opposite to common sense like you normally use on a valve (in is less, out is more) cause normally you are tweaking fuel. This valve tweaks AIR so it is exactly opposite. Will make a big difference in higher rpm performance. Been there done that.

Mark

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John (UK)

10-09-2004 05:07:39




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 Re: Engine miss above idle in reply to Ernest Lipps, 10-08-2004 18:01:30  
Have you checked the ignition timing, if you are too far advanced you can get this. Also check fuel flow from carb over a few mins not just a carb full, its possible that the flows decreases after a few minutes for some reason.You dont say what engine you have if it is a TE20 as you say it would have a Continental but it wouldn't be 12v so cant be sure what you have.If you tell me what the engine is I can let you know what the timing should be...email me at:- fergusontractors at hotmail dot com

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Don Co.

10-09-2004 06:09:35




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 Re: Engine miss above idle in reply to John (UK), 10-09-2004 05:07:39  
Johns right. A lot of problems can be solved by using a timing light. I thought my problem with running rough and what sounded like a burned or stuck valve, was just a timing problem. I know the timing port is a little awkward to look into but it will solve a lot of your problems. Now they don't make anymore 6 volt timing lights but just take a 12 V. battery and sit it next to the tractor on the ground and there's your power. Time it you won't be sorry.

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Ernest Lipps

10-09-2004 08:10:07




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 Re: Engine miss above idle in reply to Don Co., 10-09-2004 06:09:35  
Thanks everybody think I may have it or at least real close, have to wait on engine to cool back down again. Seems like it was mostly the timing although pulling each ignition wire away from sparkplugs one at a time #1 had the least amount of rpm drop and 2-3-4 all dropped about the same lower rpm's. After finding very little rpm drop on #1 pulled gas tank and checked valves on #1 right on 0.015 and no valve seems to be sticking. Oh by the way this is a 1948 TE20 converted over to 12 volt, thats why I removed the ballast and old coil and replaced with NAPA IC14 12 volt with built in 3.2 ohms resistance. The timing was advanced way too far, have rebuilt the lucas distributor and replaced the top spindle ball bearing after getting measurements from old bearing. The bottom spindle bushing near the drive gear still has some excess play in it causing to much looseness at point gap setting will try to locate a bushing for that next or have one made from the bronze oilite material. What keeps bugging me is when this miss was occuring could return to idle and engine would smooth out even though most of the misfire is on #1 cylinder.

Ernest

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txblu

10-10-2004 06:53:46




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 Re: Engine miss above idle in reply to Ernest Lipps, 10-09-2004 08:10:07  
Timing as a function of rpm's is the centrifugal advance. Apparently John (UK) nailed the problem and put you onto it. With the timing set fast, the advance just pushed it out too far to be effective at higher rpm's.

Glad you got it fixed.

On the thermostat. Have a Ford Diesel that likes a 160. Last winter I thought I'd do the engine a favor and installed a 180. Wrong. When it got hot it started missing. Put the 160 back in and all was ok. Must be a similar thing to what you had with maybe a valve sticking in the seat.

Funny, though I use the finest HD oils and MMO in the diesel, engine hasn't seen a wrench for who knows how long, starts right up in cold weather with the glow plugs, has 3600 hrs on the orig hour meter. So, I'm confused as to the mechanism that causes the problem hot.....but not too confused. More like just curious. The 160 stays.

Mark

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Ernest Lipps

10-09-2004 11:20:17




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 Re: Engine miss above idle in reply to Ernest Lipps, 10-09-2004 08:10:07  
Okay update on engine miss, started tractor back up, and after warming up engine started missing on #1 cylinder again. So had a thought, warmest water is around #1 cylinder on it's way to radiator top return hose, removed thermostat and engine quickly cooled down. To put this to a test went and graded driveway appox. 275 feet, also ditched each side first to remove grass in gravel, this took around 30 minutes engine never has missed yet. Got a theory that one of the #1 valves is a little tight in guide, and by removing thermostat this has allowed the water to run cooler and is keeping the valve from seizing in guide. Will try running some more tomorrow.

Ernest

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txblu

10-13-2004 09:54:54




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 Re: Engine miss above idle in reply to Ernest Lipps, 10-09-2004 11:20:17  
Sounds like you're gonna make it.



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