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Farmall & IHC Tractors Discussion Forum
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Ask the experts. Need some MD help.

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lbg57

07-11-2020 18:15:44




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I have been in this MD restoration for the last 11 years. Work/family issues have dragged it out this long. Have been in the assembly stage for the last year. I am at the point of trying to start it but no go. It had a battery ignition on it and ran fine before tear down. I wanted to put it back to original and converted it to a magneto ignition like my others with a rebuilt mag I bought off eBay 5 years ago. Following is a list of things that I have checked and double checked.

1) Double checked the timing marks on the gear train by the assembly photo I took before putting the front cover on, all right on.

2) Pulled mag drive off to check timing, was right on.

3) Checked mag timing 3 times. Mag tripped on #1 cylinder when on the "M" mark on the pully, not 9/16" past "M" as per what the manual stated. Adjusted to 9/16" past "M" but no difference.

4) Checked spark on all cylinders with an inline spark checker, it made it light.

5) Took plugs out, grounded them, turned it over, it produced a small bluish spark.

6) Took carb off. Float & needle move. Lifts needle off seat. Float height is correct.

7) Checked all start linkage adjustments 3 times. All correct.

Checked start valve clearances, all right on.

9) Double checked valve timing and clearances, all good.

10) Manifold butterflies are working properly.

I loosened the injector nuts to be sure their was no diesel going to the cylinders. As much as I do not like using starting fluid, I did loosen the intake crossover pipe and shot some directly in their while turning it over. Not even a pop.
When turning it over on gas, it spins over quickly and almost wants to take off. Their is blackish smoke coming from the exhaust, turns white when either is shot in and returns to blackish when spinning over.
When I pulled the plugs they are black soot covered. I have cleaned them and rechecked the gap a few times. Gap was right. Plugs were not wet as in a flooding issue.

What do you guys think? What am I missing here? Could it be that the magneto magnet is weak and not producing an adequate spark when under compression? I am at a loss here. Any suggestions would be greatly appreciated. Thanks.

A couple more things I forgot, the points are aligned and set per the manual. I took a compression check on all 4 cylinders and showed to be around 115+ psi on the gas side with all new parts not seated in yet.

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lbg57

07-12-2020 18:54:43




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 Re: Ask the experts. Need some MD help. in reply to lbg57, 07-11-2020 18:15:44  
J Hamilton: Thank you very much for that info. I will give him a try.



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J Hamilton

07-12-2020 19:59:39




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 Re: Ask the experts. Need some MD help. in reply to lbg57, 07-12-2020 18:54:43  
You're welcome, even if you have a question about a magneto he is always willing to help you out



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lbg57

07-12-2020 17:22:49




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 Re: Ask the experts. Need some MD help. in reply to lbg57, 07-11-2020 18:15:44  
Well guys I finally got it to run on the gas side. That magneto I bought off eBay that was supposed to be completely rebuilt turned out to be a POS.

I had gotten another off eBay as a spare that the guy said worked when taken off. Was not rebuilt or any new parts. Put that one on & it took right off. Finally.

I will see about sending that other one out for repair if I can find someone who still does that.

Tried switching it over to diesel but all it would do is smoke up the garage and not stay running. One step at a time.

Thanks for everyone's help. Have a good day.

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J Hamilton

07-12-2020 17:38:19




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 Re: Ask the experts. Need some MD help. in reply to lbg57, 07-12-2020 17:22:49  
This guy is the best in my opinion for magneto repair, he has done several for me.



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rustred

07-12-2020 08:48:45




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 Re: Ask the experts. Need some MD help. in reply to lbg57, 07-11-2020 18:15:44  
you could verify firing order by removing #1 plug and make sure its on compression coming up to the timing marks then look at the rotor if its pointing to #1 plug wire. and is the spark jumping the plug gaps with a blue snap? you said small bluish spark. plus you could open up an old plug to double and triple the gap and see and hear the spark. should make a distinct snap. if the spark is orange it is too weak. maybe check or change condenser in mag. there is no guarantee on that mag you bought.

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rustred

07-12-2020 19:50:32




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 Re: Ask the experts. Need some MD help. in reply to rustred, 07-12-2020 08:48:45  
do i get a cigar? i suspected u had a poor mag. i dont smoke anyhow and never did.



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Dave BN

07-12-2020 06:21:42




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 Re: Ask the experts. Need some MD help. in reply to lbg57, 07-11-2020 18:15:44  
Do you hear the impulse click when you try to start it and is the starter turning the engine in the correct directiion?
Can you try towing it to start?
Here's a dumb question, is the oil level correct, too much oil will cause your problem.
Is the governer holding the carburetor at full throttle when the engine is not running?
Other than magnito what, if any engine parts did you replace during rebuild? Cam shaft? Timing gears? others?
Dave

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Janicholson

07-12-2020 09:45:59




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 Re: Ask the experts. Need some MD help. in reply to Dave BN, 07-12-2020 06:21:42  
The carb on a gas start diesel is not governed, it is fixed at wide open, and small enough to not let it run too fast. Jim



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lbg57

07-11-2020 19:25:49




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 Re: Ask the experts. Need some MD help. in reply to lbg57, 07-11-2020 18:15:44  
Yes I have the correct H-4, counter clock wise rotating mag.



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rustred

07-11-2020 18:43:30




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 Re: Ask the experts. Need some MD help. in reply to lbg57, 07-11-2020 18:15:44  
are you sure you have a counter clockwise mag.? as the diesels take. the gas is clockwise.



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Janicholson

07-11-2020 18:33:29




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 Re: Ask the experts. Need some MD help. in reply to lbg57, 07-11-2020 18:15:44  
The mag might be set with #1 on the exhaust stroke. 180 out. Moving the plug wires 2 holes each might make it bark. Jim



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