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1936 D (clooney-John T)

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JD1936D

05-08-2003 16:08:22

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Hi again a little refresh as to my tractor problem. It started for the first time in 10 or so years and was mis-firing and had back pressure in the air cleaner. So I removed the tappet cover and turned the flywheel. Two of the arms move together and the other two move independently. Is this correct? Dose not seem like it to me. Looking from the front of the tractor the second from left and all the way to the right move together then the third from left finally all the way to the left. If this is a problem what is wrong? What will I have to do to fix it? Any help would be appreciated.

Matt

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Clooney

05-09-2003 04:04:22

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Re: 1936 D (clooney-John T) in reply to JD1936D, 05-08-2003 16:08:22

JD1936D, 2 valves moving together is normal due to one cylinder being on intake as the other is exhausting. [as long as 2 intakes or 2 exhausts don't move at the same time you are ok.
~Your backfiring into the air cleaner is probably due to the engine firing on an open intake valve. That could be due to a sticking valve, burnt valve, bent valve, worn valve guide, worn or mis-timed cam or mis-adjustment, or even an improper timed or faulty ignition system.
~You might want to pull the outer rocker cover & MAKE SURE you have a little valve lash when each piston is at TDC on compression.
~If that�s ok, run a compression test� or better yet take an old spark plug & break the center out of it, then braze an air hose fitting to the plug so you can use your air compressor to put compressed air in the cylinders. Then bring each piston to TDC & add about 70 lbs of compressed air & see where it comes out. If it comes out of an intake valve you know where your problem is�.
~If it passes the air leak down test you probably have a carb or ignition problem & will have to isolate which one it is & go after that..

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JD1936D

05-09-2003 12:21:24

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Re: Re: 1936 D (clooney-John T) in reply to Clooney, 05-09-2003 04:04:22

Clooney, I'm new to this antique and tractor stuff. What is valve lash clearance? Also we have not yet adjusted the carb just what our friend set it at when it was rebuilt, because it was not sounding right and didnt want to break something. Should we start it and mess with the carb? Could it be the problem? We also flooded her pretty good trying to start it the first time. This any problem? What would be involved in fixing a bad valve? Thanks for all your help.

Matt

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John T

05-08-2003 22:13:23

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Re: 1936 D (clooney-John T) in reply to JD1936D, 05-08-2003 16:08:22

Hi again Paul, the valve operation is posted below as far as sequencing, and assuming your cam is timed correct to the crankshaft and is the right cam, theres hardly any way it cant be opening and closing the valves at the right time. The thing I was worried about earlier when you posted you had pressure out the air breather, was that one of the intake valve lash adjustments was either set too tight not allowing it to close, or it was sticking or leaking.

When the valves are closed, see if theres somewhere around a 0.020 gap between the rocker arm and the valve stem. If there is and youre still pressurizing the air cleaner, I wonder if one of the intake valves is leaking.

I forget if we discussed ignition timing earlier??? When the left (flywheel side) cylinder is at TDC on its compression power stroke, the Left Hand Impulse mark on the flywheel should be in the 3 o clock position in line with a mark on the tractors side. Thats when the mag should snap and fire the left cylinder while the right fires 180 degrees later.

Check the ignition timing and valve lash clearances and then we will go from there.

Good Luck, John T

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Paul from MI

05-08-2003 20:00:52

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Re: 1936 D (clooney-John T) in reply to JD1936D, 05-08-2003 16:08:22

Matt,
The sequence of rocker arm movement is the same with all of the old two cylinders. Starting with the left piston at TDC(LH impulse mark on flywheel in line with mark on main case) and BOTH LH valves closed, as follows each 1/2 revolution of the flywheel:
1. LH exhaust closed, LH intake closed, RH intake closed, RH exhaust closed. Notice I gave these to you as they appear left to right on the tractor if you aren't sure which is exhaust and intake.
2. LH exhaust open, LH intake closed, RH intake closed, RH exhaust closed
3. LH exhaust closed, LH intake open, RH intake closed, RH exhaust open
4. LH exhaust closed, LH intake closed, Rh intake open, RH exhaust closed
5. Start sequence over

If any of the valves are in time with the piston on that cylinder they all will be in time, barring a broken camshaft which would be EXTREMELY rare.

Hope this helps,
Paul

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