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H Farmall Magneto Timing- Help!


 
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Andy Motteberg
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Location: Detroit Lakes, MN

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PostPosted: Sun Sep 23, 2007 8:21 am    Post subject: H Farmall Magneto Timing- Help! Reply to specific post Reply with quote

Hi,
I'm going to time the H4 magneto to the engine on my 1943 Farmall H today. My problem is, for some reason, I cannot find either of my H manuals that gave instructions on the timing.

Could someone tell me how to time the mag to the engine? Just insctructions, could even be from your manual, just something I can print off and read it as I try to time the tractor. If I can get the magneto timed today, my H will probably run today.

Thanks for all the help!

Andy.
 
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Yugrotcart
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PostPosted: Sun Sep 23, 2007 9:04 am    Post subject: Re: H Farmall Magneto Timing- Help! Reply to specific post Reply with quote

Andy,
Bring no. 1 piston to TDC, turn the mag so the rotor points to #1 on the cap, install the mag, turn the mag towards uou til the impulse snaps.
Here is a link to a mag manual.

Paul
http://www.cleancomputes.com/Cub/Blue%20Ribbon%20Service%20Manuals/GSS-5035%20Service%20Manual%20Magnetos/index.html
 
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Wayne in MN
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PostPosted: Sun Sep 23, 2007 9:08 am    Post subject: Re: H Farmall Magneto Timing- Help! Reply to specific post Reply with quote

Battery ignition timing

First, make sure the timing is set correctly. Late timing (too small of a gap or incorrect setting) will act like too rich carburetor problems.
Timing should be set so the points open (set the gap first, .016" for battery ignition) when the timing pointer is between the double marks on the pulley; use the crank or turn the fan by hand (switch off) to locate the marks. With the switch off; use an ohmmeter or self powered test light to verify the point opening instant. This can be done with either #1 or #4 at TDC. Loosen the 2 distributor hold-down cap screws and rotate the body of the distributor in the direction of normal rotor travel until the points are closed (test light is on, ohmmeter reads very low ohms). Now rotate the distributor body backwards until the points JUST open; lock the cap screws and you are good to go.
It is CRITICAL for the points have to be CLEAN and ADJUSTED first.
If you have a 12 volt test light, turn on the switch after locating TDC and follow the same procedure. The light is on with points closed and off when the points open.
Needless to say, points, rotor, cap, & wires have to be in decent shape.

Now start the engine & warm it up in NEUTRAL and BRAKES LOCKED; run at WOT (wide open throttle) and turn the high-speed adjusting screw in & out to find the "sweet spot" where the engine runs its fastest & smoothest. Turn this high-speed screw out an extra 1/2--3/4 turn for power. Idle the engine down & set the idle speed. Now turn the idle mixture screw in to richen, out to lean so the idle is smoothest (this is an AIR adjusting screw so works opposite of the main fuel screw on the bottom of the carb). Re-adjust the idle speed. Perform the carb adjusting procedure another time to be sure all mixtures are correct.
Don't forget that in the winter your air cleaner may cause richness due to cold oil in the cup or even ice blocking the air passage.
 
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Andy Motteberg
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PostPosted: Sun Sep 23, 2007 9:10 am    Post subject: Re: H Farmall Magneto Timing- Help! Reply to specific post Reply with quote

Thanks Paul, I will try that.

Thanks,
Andy.
 
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Andy Motteberg
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Location: Detroit Lakes, MN

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PostPosted: Sun Sep 23, 2007 9:16 am    Post subject: Re: H Farmall Magneto Timing- Help! Reply to specific post Reply with quote

Wayne,

When you say "Battery Ignition", I assume you are talking about a distributor??? I have a H4 magneto on my H, I sold the distributor that was on it. The magneto has new points, condenser, cap & rotor. Is timing on a mag and distributor the same?

Thanks for your reply.

Andy.
 
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gene bender
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PostPosted: Sun Sep 23, 2007 4:00 pm    Post subject: Re: H Farmall Magneto Timing- Help! Reply to specific post Reply with quote

He has a magneto
 
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gene bender
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PostPosted: Sun Sep 23, 2007 4:04 pm    Post subject: Re: H Farmall Magneto Timing- Help! Reply to specific post Reply with quote

That will work as the other post says just remember you CANNOT ADVANCE TIMING ON THE I-H MAG they fire on T.D.C. then go to around 35deg when engine runs fast enough to where the impulse kicks out.
 
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Andy Motteberg
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Location: Detroit Lakes, MN

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PostPosted: Sun Sep 23, 2007 5:39 pm    Post subject: Re: H Farmall Magneto Timing- Help! Reply to specific post Reply with quote

Thanks Paul!!! My H is running great now!!

Thanks!

Andy.
 
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Yugrotcart
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PostPosted: Mon Sep 24, 2007 11:39 am    Post subject: Re: H Farmall Magneto Timing- Help! Reply to specific post Reply with quote

Andy,
Gald I was clear enough so you would understand how to time it. I have my W6 timmed this way and hand crank it alot, with no kick back.
This procedure was something I learned off this forum, glad I was able to pass it on to you.

Paul
 
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