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Massey Harris & Massey Ferguson Tractors Discussion Forum
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MF35 runs OK then quits

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Rich W.

10-20-2004 19:32:32




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I have an MF35 that quits after running for about 30 minutes. The engine [Z134 gas] has about 60 hours on the rebuild. It starts fine and runs OK while mowing and after 30 minutes or longer it will start to miss and then quit. Pulling the choke out will keep it running. When it quits it will immediately start up OK and run for a few minutes. Quit again and restart again.It will also sit and idle with no problems. During the rebuild process I cleaned the gas tank and coated the inside. I have checked the screen at the top of the sediment bowl, checked the screen in the elbow on the Marvel Scheb carb., blown out the fuel line, drilled a hole in the fuel cap to vent.During the engine rebuild I took the carb apart and soaked in carb cleaner and used a rebuild kit. Since this problem developed I have had the carb apart a half dozen times thinking maybe the float was sticking. I have been approaching this like a fuel problem. Is it possible the float is sticking at times or do I need to look in another direction? I have looked in this forum and some mention the coil or condenser causing stalling when the engine heats up but the choke helping makes me wonder. Any suggestions? Thanks, Rich W.

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Karl

10-27-2004 11:37:06




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 Re: MF35 runs OK then quits in reply to Rich W., 10-20-2004 19:32:32  
Boy does your problem sound familar. I cleaned and lined the tank on my MF202 (the industerial version of a 35). I had the very same problem develop. I went through the entire fuel system and carb without fixing the problem. Then I realized the one thing I hadn't checked was the gas cap.

Apparently, when I sealed the tank, I had also sealed the vent in the cap which created a vacuum in the tank as the fuel level dropped. I cleaned the sealant out of the cap with some MEK and I haven't had a problem since. The easiest way to test this is try running it with the gas cap off. If it quits then the problem isn't the cap.

Good Luck!

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Jrry

10-22-2004 11:56:08




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 Re: MF35 runs OK then quits in reply to Rich W., 10-20-2004 19:32:32  
Rich, I'd put my money on restricted gas flow. I've had too many do this. It's getting gas just not fast enough.



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John A (TX)

10-21-2004 20:46:10




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 Re: MF35 runs OK then quits in reply to Rich W., 10-20-2004 19:32:32  
Tell you a story about my Ford 601. It did just about what your MF does: ran 20-30 minutes under load & then quit. And I did just about what you've done: Rebuilt carb - many times! - so now it can't be a fuel problem, right? Ah, must be something electrical breaking down when it gets warmed up. So replaced condenser, replaced coil, checked points, tested ign switch, replaced most of the wiring, checked that gas cap was vented, etc. No change. It would idle for hours if I'd let it; just wouldn't run more than 20-30 minutes under load.

Then - and I believe it was txblu/Mark who suggested this - I started timing the fuel flow.

A. Took the bottom of the carb off & timed fuel flow thru the main jet into a coffee can, to a specified mark. Time was around 55 seconds.

B. The sediment bowl was bolted directly to the carb, so unbolted the carb, and timed fuel flow again, now out of the sediment bowl. Again, time was around 55 seconds.

C. Then disconnected sediment bowl from fuel line, & timed a third time. Around 15 seconds to the mark, and not the 55 or so I was expecting.

Conclusion: There was an obstruction in my sediment bowl. Wrong hollow bolt holding sed. bowl to carb in my case. Letting enough gas into the carb to idle forever, but couldn't keep up with fuel draw under load.

If times of A., B. and C. had all been the same - and if I was SURE the gas tank/fuel line/shutoff valve didn't have an obstruction, THEN it might be time to think about electrical stuff.

Well, this is long-winded and I apologize for that. Trying to splain a thought process, though, and I guess I could do a better job. Anyway, hope this helps.

John A (TX)

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Rich W.

10-27-2004 18:41:49




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 Re: MF35 runs OK then quits in reply to John A (TX), 10-21-2004 20:46:10  
Thanks to all who have responded on my MF35 problem. During my last carb removal I adjusted the float thinking it may not have been moving freely. When I then ran the tractor it quit sooner. I am wondering if I am not getting the float adjusted properly. I will try the fuel flow rate tests also to see if that may be the problem. Thanks again to all. Rich W.



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txblu

10-22-2004 06:30:21




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 Re: MF35 runs OK then quits in reply to John A (TX), 10-21-2004 20:46:10  
Nice job John. Just as accurate as the day(s) you did it and thanks for the nod.

Mark



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John A (TX)

10-22-2004 08:13:08




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 Re: MF35 runs OK then quits in reply to txblu, 10-22-2004 06:30:21  
Thanks, but in re-reading it, I'm not sure if it was such a good job after all. Was trying to make the point that I could have saved myself a bunch of time spent fooling with electrical stuff if I'd thought it out logically instead of scattergunning it. Oh, well. Maybe Rich'll figure out what I was driving at.

Say, do you know of any websites for MF's that are at all similar to The Vintage Ford Tractor Resource at>Link

I'm>Link pretty clueless when it comes to the different older models of MH and MF and how they were equipped (gas/diesel, frinstance). A reference site would sure be handy but just haven't found anything yet.

Regards,
~ja

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txblu

10-22-2004 09:46:32




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 Re: MF35 runs OK then quits in reply to John A (TX), 10-22-2004 08:13:08  
Dunno, but I'm not the one to ask. Since my 35 has had 0 problems except for my wanting (and doing) the fuel gauge functioning thing, All I do with it is use it.

Bet there is though. Too many of them around.

Mark



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Joe Kelly

10-21-2004 07:51:39




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 Re: MF35 runs OK then quits in reply to Rich W., 10-20-2004 19:32:32  
Had the same exact problem on my gas MF135 following a major overhaul. Took it back to the dealer twice...they said it started and ran fine for them but when I would get it home it would not run more than 30 minutes. I did all the same things you have done except I did not look inside the valve between the gas tank and bowl. When I finally....I found a bit of trash. I cleaned it out and have had no further problems.

Joe

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txblu

10-21-2004 06:53:10




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 Re: MF35 runs OK then quits in reply to Rich W., 10-20-2004 19:32:32  
Pulling out your choke has absolutely no impact on an ignition problem. If any, it would be to flood the engine with too much fuel.

Divide and conquer.

Get a can of starter fluid and remove the inlet to the carb so you can spray into it somehow.

Go about your business with the spray handy.

When it farts, smack it. If it recovers immediately, it's fuel. If it ignores you get your sparkey cap on and get after the sparks.

Real simple. Real cheap. Real relable answer.

Mark

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Steve G

10-20-2004 20:03:08




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 Re: MF35 runs OK then quits in reply to Rich W., 10-20-2004 19:32:32  
Actually it sounds like an electrical problem. A coil will act like thaat when it gets hot. The spark gets weaker and then quits. Let it cool down starts right up and runs again till it gets hot and starts doing it all over again. Just on the off chance check the condensor also. Make sure the coil is twelve volt also and not six volt if you changed coils. Hope this helps you.



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Rich W.

10-20-2004 20:22:17




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 Re: MF35 runs OK then quits in reply to Steve G, 10-20-2004 20:03:08  
Thanks for the suggestion. The coil is one of the parts I did not change during the rebuild. It looks to be original so about 40 years old maybe. I'll give it a shot. Thanks again, Rich W.



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