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Farmall & IHC Tractors Discussion Forum
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Adjusting Timing on an M

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turbos10

05-21-2006 09:03:23




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Hey guys,

With the new turbo setup running on my M, it is likely that I will need to tinker with the timing before all is said and done. First, I wanted to see if you guys can tell me if the distributor has a mechanical advance like a car, or if it is set to one position. If it is set to one position, what would be the procedure for adjusting it to take out just a few degrees. As boost comes up, I need to be able to knock a few degrees out of it.

Thanks,

Chris

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Dave Slater

05-21-2006 14:28:23




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 Re: Adjusting Timing on an M in reply to turbos10, 05-21-2006 09:03:23  
Turbo, The Max advance in the IH distributor is controled by a hole or slot in the dist. shaft.If you remove the plate from dist that points are mounted to then advance springs and weights then point cam,you can see the hole.It is possible to find shafts with smaller holes for different advance but cheapest way is to braze hole up some and then file it bigger until you get advance you want.Smaller the hole the less total advance. To do that take pin out of dist. drive gear and remove shaft first.After all these years its hard to tell what advance you find in there,most of them have a number on plate part of shaft and that was the total advance.

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Bob M

05-21-2006 09:49:56




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 Re: Adjusting Timing on an M in reply to turbos10, 05-21-2006 09:03:23  
Chris - The stock distributor M is equipped with centrifugal (mechanical) advance. I'm not certain but recall something like 0 deg at low idle to a max of 35 deg at 1,100 RPM and above.

If you want retard the spark simply rotate the distributor body ONE HALF the number of degrees of retard you desire, rotating it in the direction of dist rotor rotation (clockwise for an M...)



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Turbs10

05-21-2006 10:06:58




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 Re: Adjusting Timing on an M in reply to Bob M, 05-21-2006 09:49:56  
Thanks Bob!

Questions....

Would it just be easier to limit the mechanical advance so idle would stay the same? I figure some modification to the weights would work.

Is there some way to check timing with a light as on a car. I see a timing pointer, but not much on the pulley in way of degree marks.

Thanks,

Chris



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Bob M

05-21-2006 11:12:44




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 Re: Adjusting Timing on an M in reply to Turbs10, 05-21-2006 10:06:58  
Chris -

>Would it just be easier to limit the mechanical advance so idle would stay the same? I figure some modification to the weights would work.<

If you make the weights lighter (grind metal off) full advance will occur later - ie. at a higher RPM. Or you can install stiffer springs and get the same result.

Tip: When messing with timing don't adjust the distributor more than a couple deg before TDC at rest. Otherwise the engine will want to backfire when cranking, making it difficult (or impossible...) to start.

>Is there some way to check timing with a light as on a car. I see a timing pointer, but not much on the pulley in way of degree marks. <

Sure! A regular automotive timing light works fine. There's a notch in the crankshaft pulley for top dead center. (Or if there's two notches close together TDC is the first notch to pass the pointer in the direction of pulley rotation).

A second notch a couple inches away marks full advance - 35 deg I think.

You can figure and mark intermediate timing settings between the TDC and 35 deg notches, then use a timing light to set timing.

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Janicholson

05-21-2006 11:09:31




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 Re: Adjusting Timing on an M in reply to Turbs10, 05-21-2006 10:06:58  
Sure, Divide the circumference of the pulley (C=pi*D) by 360. This little number will be the size of each degree. Plot, or draw 40 of them on a piece of tape. Place the tape on the edge of the pulley. use a mini cutoff abrasive wheel on a Dremel to place notches in the rim. For every five make it deeper. JimN



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Turbs10

05-21-2006 11:34:31




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 Re: Adjusting Timing on an M in reply to Janicholson, 05-21-2006 11:09:31  
Awesome Guys!!!

Thanks again for the quick and helpful responce. I love that this forum is full of knowledgable people and no BS.

Chris



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