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49' M fuel/timing question

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jamie

06-23-2004 19:45:19

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Just fixed a problem I've been having with the intake on the sediment bowl getting blocked by replacing the fuel bowl and line with an inline filter. No more problems maintaining good gas flow to the carb but even so, it tried to die on me coming back to the barn after running it for quite a while with no problems. I had pulled back on the throttle and the engine hesitated and tried to die. Normally, it has good throttle response. I set it back to idle and it kept running (got used to that with the fuel blockage before). I verified that there was plenty of fuel and flow to the carb by draining gas out of the carb. I thought it might have been running a little rich so I turned the main adj screw in about a turn. It cranked right up and ran fine to the barn. Since I haven't had time to build a tall enough shed for the tractor, I have to take off the muffler each time I put it in the barn. When I did, I pulled back on the throttle lever again to see how it would react then and I got a little fire out of the manifold initially. Is this because I now have it too lean or is the timing a little late? I didn't notice that before I changed the main setting on the carb. The timing has been set and the coil,spark plugs, wires, points, cap,rotor were all replaced prior to the problem. I know I need to check the valve clearance. Could that be the problem? This may be normal, but one other thing I notice is that when I crank it up I always get a puff of smoke which I assumed was some oil leaking past the rings burning off. Other than that, it runs strong and sounds great. I'm using 10w-40 Delo in it I believe instead of straight 30w. Before I changed the oil, I don't think it smoked at start-up like that. Should I go back with straight 30w? It doesn't burn much oil at all, just a little puff here and there. I haven't checked the compression (low compression gas/dist engine) yet, but I believe its good.

The tractor has a rebuilt carb (float needs to be adjusted - noticed a little gas dripping out the carb), a new manifold, and is a 12volt system.

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jamie

06-24-2004 08:57:08

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Re: 49' M fuel/timing question in reply to jamie, 06-23-2004 19:45:19

guys, fuel flow definately isn't the problem. The sediment bowl is gone. I took it out of the system because the way the inlet is designed, sediment gets caught in the neck. I have a nipple on the tank with 5/16" rubber fuel line running to the inline filter (glass so you can tell if its got flow to it or is clogged) and then onto the carb. It's a straight run with no bends so there is no way for blockage except in the filter and you can tell if its blocked obviously. I have good flow, you can open up the drain on the carb and have a steady flow til you drain the tank. There is some sediment in the inline filter, but the way its designed fuel still has plenty of surface area to flow through. Once the sediment gets bad in the filter, I'll change it. I have a buch of replacement cartridges for it to eventually hopefully get all that crap out of the tank that the sediment bowl neck kept getting clogged up with.

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rustyfarmall

06-24-2004 11:30:39

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Re: Re: 49' M fuel/timing question in reply to jamie, 06-24-2004 08:57:08

Jamie, we all know how in-line filters work. Are you sure that the one you are using is meant for a gravity flow system? Some of them are meant to be used with a fuel pump, and will not function properly on a tractor that does not use a fuel pump. Most of us on this forum have experienced the same exact problem you are now encountering. We have all learned that the only solution is to thoroughly clean the gas tank, and then install a screened inlet for the line to the carb. By the way, the screen I mentioned in my other reply was standard equipment when your tractor was new. You should not try to outguess the people who designed and built the tractor.

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Dan

06-24-2004 07:30:40

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Re: 49' M fuel/timing question in reply to jamie, 06-23-2004 19:45:19

I put an in line filter in the fuel line on my MSTA as it sat for some time outside and had rust in tank. As mentioned it really didn't help the rust in tank blocking sediment bowl inlet. I had trouble with it letting fuel through properly so that if it ran out of fuel in the carb I had to bleed the line to the carb beyond the filter to get fuel to flow. Not sure if I had the wrong type filter. I think I would go to straight 30 wt oil in the M but I wouldn't worry about a puff of smoke when starting. Probably oil that goes down valve guides when engine is stopped. Old timers felt it at least kept valves oiled and guides can be too tight.

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rustyfarmall

06-24-2004 05:15:40

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Re: 49' M fuel/timing question in reply to jamie, 06-23-2004 19:45:19

It sounds to me like you are still having a periodic fuel starvation problem, replacing the sediment bowl with an in-line filter was not a bad thing to do, but it will not solve the problem if there is rust, scale,etc. in the tank. You need to remove the fitting which is screwed into the tank, and adapt a fine mesh, cylinder shaped screen to that fitting. The screen should be made of brass, about 1 to 1 1/2 inches long, and pinched shut at the top. JB weld works good for holding it in place.
Here's a hint, the fuel inlet screen in the carburetor is just about perfect for this application, so if you have an old one, use it. It can be removed from the fitting it is in by heating with a small propane torch.

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Wayne Swenson

06-23-2004 21:34:33

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Re: 49' M fuel/timing question in reply to jamie, 06-23-2004 19:45:19

With the engine warm & running at wide open throttle (WOT), turn high speed mixture screw in until the engine begins to starve for fuel. Then turn the screw out until it begins to blubber. Now find the "sweet spot" in between the two settings. If you are working the engine (plowing, etc.), then the high speed screw needs to be turned out about 1 turn or more to be sure the engine has enough fuel for the extra power it is being called to produce.
The same proceedure can be followed for idle mixture with the addition of the ldle stop screw to set the low speed RPM.
On the "M" carb, the idle mixture screw is an air adjusting screw so turning in will richen the mixture and out will lean the mixture.
Once you have set the mixture screws once, do it over again to "fine tune" the settings.
Aren't carbs fun!!

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jamie

06-23-2004 23:24:52

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Re: Re: 49' M fuel/timing question in reply to Wayne Swenson, 06-23-2004 21:34:33

Thanks wayne, I know the process for adjusting the carb and there were no problems with it before. My question isn't how to fix the problem, its more of "what the heck is the problem".

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jamie

06-23-2004 20:10:30

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Re: 49' M fuel/timing question in reply to jamie, 06-23-2004 19:45:19

also, one other thing I noticed a while back... after running it hard on a humid day, I noticed that the top of the carb had condensation on it and was cold to the touch. I know why the condensation formed... but is that normal for that to happen?

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rustyfarmall

06-24-2004 05:18:58

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Re: Re: 49' M fuel/timing question in reply to jamie, 06-23-2004 20:10:30

Jamie, my M does the same thing, I don't consider it to be "normal", but it really isn't a problem except in real cold weather.

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jamie

06-24-2004 08:37:32

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Re: Re: Re: 49' M fuel/timing question in reply to rustyfarmall, 06-24-2004 05:18:58

mine is doing it in hot and humid weather though...

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rustyfarmall

06-24-2004 11:16:21

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Re: Re: Re: Re: 49' M fuel/timing question in reply to jamie, 06-24-2004 08:37:32

Yes, mine does it in hot, humid weather also. What I was getting at is the fact that it will also occur in cold, damp weather, and then you have a problem with frost forming both on the outside of the carb, and the inside of the intake. The engine will run very poorly when this happens.

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