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TD 6, When TDC is not TDC


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11 hours ago, reggievonruffnut said:

The bush is greener and rugged, the outback is dry, desolate, unforgiving and the crows fly backwards to keep the dust out of their eyes.

you said you were getting a good spark out of the coil wire that leads to the distributor cap, that means the points are working ok, that means the problem should be beyond that point, which could be the distributor cap, the rotor button, the leads or the plugs.

reg

Reg, I have determined to check each of those things out, as soon as the rain stops, something I didn't do was to check the resistance in the wire going to the towwer from the coil, Never thought of that as a possible problem.  I'll check all the wires, but the tower to coil one seems important to check first.

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Hi again Reg,  I used my ohmmeter and the wire to the tower is good and the  carbon rubbing area to teh tower reads good, the wires are all good so I am going back to the timing. it must be that the impulse drive is tripping before the rotor lines up with the #1 spot in the distributor, it looks right, but I can{t tell precisely so, I{ll start at the points making sure they are open on the high lobe, then put the engine at tdc plus the 10 to 15 mm, go back and push the mag away from me slowly until the impulse drive trips. and check for spark.  Everything was working fine, like I said when I shut it down a few months back.  I{ll post how this turns out.  I{m sure its something simple I an doing wrong or not doing. 

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On 4/1/2022 at 4:31 AM, td9inidaho said:

Well, at this point it's just throwing ideas out there, when I rebuilt my 9, I had the wires setup for incorrect rotation of the distributor.  In your first post you said the wires were wrong, and very possibly so.  I am looking through and old manual, and it is saying there is right hand rotation mags, and left hand rotation. When you routed the wires, you are sure which direction yours is turning?  I went by the manuals and what I understood, but untill I pulled the cap and watched while cranking, I was backwards. I had no fire at all on a new motor, untill I got that straightened out. You might be right, I'm just throwing out there what happened to me. 

Mark

 

counter Clock wise for TD's

Serial number with a 'D'  See chart below.

This is because if you look at the chain of timing gears, the TD's have an extra timing gear, giving a 'swap' in rotation compared to gasoline engines

MagnetoMarkings.jpg.b3d808660777de7908c4f55788aaff19.jpg

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My dozer stopped starting again, I diagnosed with a timing light that the spark was inconsistent,  if the plug grounds out you don’t get a light flash from the timing light , this was being caused by the plugs breaking down and grounding under compression, they all tested ok out of the engine giving good spark and the timing light giving a good flash.

reg

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3 hours ago, Tracksbeatwheels said:

Hi again Reg,  I used my ohmmeter and the wire to the tower is good and the  carbon rubbing area to teh tower reads good, the wires are all good so I am going back to the timing. it must be that the impulse drive is tripping before the rotor lines up with the #1 spot in the distributor, it looks right, but I can{t tell precisely so, I{ll start at the points making sure they are open on the high lobe, then put the engine at tdc plus the 10 to 15 mm, go back and push the mag away from me slowly until the impulse drive trips. and check for spark.  Everything was working fine, like I said when I shut it down a few months back.  I{ll post how this turns out.  I{m sure its something simple I an doing wrong or not doing. 

Get some new plugs before you try anything else,

Champion 49 or D89D

reg

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  • 2 weeks later...

Hi Everyone, IT RUNS!!!!  Like so many car problems, I did so many things that I'm not sure what the problem was.  I reset the points, set the timing so the impulse drive just tripped, and cranked away.  It backfired, so I checked the firing order and swapped two wires, cranked again and she fired up!  Runs well.  Thank you Reg and everyone else who responded to my cries for help.  Without this Forum, I don't think I could have ever solved the problem.

Now, I can get down to changing the hydraulic fluid for the blade and welding some cracks in the blade.  Hard to do when I couldn't drive it over to the shop.

SO HAPPY!!!!,   THANK YOU, THANK YOU, THANK YOU ALL!

TRACKSBEATWHEELS

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Now tracks might beat wheels wasn't looking promising for awhile 😁

Your name reminds me of R cubed he had a fantastic thread on steel vs rubber RIP

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