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Farmall & IHC Tractors Discussion Forum
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Farmall MD Removal Of Behlen PS Timing

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md_650d

08-02-2020 06:32:24




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Hello everyone I have a Farmall MD tractor. I am in process of removing the Behlen power steering off of it. My question is how do I time the factory magneto drive with the tractor since the Behlen ps unit one is removed and have to install the factory drive and wanna get the timing correct




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D Slater

08-04-2020 05:54:31




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 Re: Farmall MD Removal Of Behlen PS Timing in reply to md_650d, 08-02-2020 06:32:24  
Thanks for the correction. Just thought to point out the power steering for that system may not be mounted direct to rear of front cover. Then my mind went to a gasoline engine on timing. Should have noticed I made a mistake when I put notches in. One thing though the first mark that reaches pointer is TDC on most and marked DC with the M reaching it after. without looking I think you are correct the mag trips at the M mark. Distributors on later ones time to the DC mark.

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D Slater

08-02-2020 18:38:08




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 Re: Farmall MD Removal Of Behlen PS Timing in reply to md_650d, 08-02-2020 06:32:24  
Think the pump he has just bolts to the ignition drive housing. If it is like it was before pump was installed between it and Mag, Mag should just go back in the drive slot and finish timing when the front pulley notch and pointer are lined up if not installed 180 out. First notch to pointer when turning crank the normal running direction is is TDC. Engine needs to be on front cylinder compression stroke.

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used red mn

08-02-2020 22:38:21




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 Re: Farmall MD Removal Of Behlen PS Timing in reply to D Slater, 08-02-2020 18:38:08  
Mr. Slater you have directed the poster to time it to the correct notch but you incorrectly named it. The first notch to pass the pointer in normal rotation is referred to in the service manual as the ..M.. notch or ..Magneto.. timing notch. The second notch is the TDC notch. It just struck me as odd that an engine would have timing marks ..after.. TDC which would be the case as you described it so I pulled up the copy of the service manual I have. Think of it this way, as the crank rotates towards TDC the piston is raising up in the bore or it is before the top of its stroke. Once the piston passes ..TDC.. all degrees of rotation are AFTER ..TDC.. In most all engines the firing point whether it is by spark ignition or fuel injection takes place before TDC because the fuel does not instantaneously ignite. So it needs some time to burn and expand the gases to build optimum pressure in relation to the most ideal leverage point of the rod angle to the crankshaft throw. Thus engines in general are timed in advance of TDC. That was an overkill explanation but probably valuable to some.

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used red mn

08-02-2020 14:44:31




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 Re: Farmall MD Removal Of Behlen PS Timing in reply to md_650d, 08-02-2020 06:32:24  
Hopefully you havenít taking it apart yet and it is a running tractor or at least free as in not locked up. Open up the cap on the mag that the spark plug wires go in. Turn the engine so that the rotor is approaching the terminal for the wire to number one cylinder. Keep turning until you hear the mag impulse coupling click for number one cylinder then stop right there. Mark the mag housing with a marker where the center of the rotor points. Now disassemble and reinstall the needed parts. Reinstall the mag with the rotor lining up with the mark or with a small amount of degrees behind it in the direction it turns. I am not sure if that is explained in the clearest terms but if you read more I think it will be self explanatory. To do this the slots on the mag mounts will be slightly counterclockwise ...diesel mag turns opposite direction of a gas.. of their original spot. Now when the mag mount bolts are nearly tight you should be able to rotate the mag housing clockwise until the impulse clicks again this is where you will tighten down the mag. Should be timed right back where it was. The reassembly may be a little difficult because you will be fighting against the wind up of the impulse spring but it should be doable. If you have already tore it apart without noting where the rotor was located it will be a little more complicated. Send me an email and I will send you a scanned IH service manual that will cover the needed information for that, email is open in Classic View.

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used red mn

08-02-2020 14:51:56




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 Re: Farmall MD Removal Of Behlen PS Timing in reply to used red mn, 08-02-2020 14:44:31  
Well after all that what I explained will really do you no good. Email me and I will send that manual. I am pretty sure it shows the correct timing marks you will need for reassembly. That is if when it is removed the hydraulic pump Drive is actually being removed from gear contact of the timing gears. Sorry, I have not worked on a diesel model.



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