D4 6U pony motor ignition

Alex ,You have it a bit arseabout . .Pilot motor needs t5he old type copper leads to run properly . It will be the Carbon lead causing the problem .

Sounds to me like he did get rid of the carbon lead...

The gear breakage sounds related to a thread I read recently about a loose flywheel causing breakage of the magneto shaft.

"M" mark on mag gear should face front of tractor.

Hope you get it straightened out and I'm glad you got it where you can work on it.

Jim

Look on Fleabay for a magneto, they come up all the time if you want to buy a complete maggy.

There is a nice guy on the ACMOC Forum down in Tassie called Inter674 who has just finished restoring a D2 or a D4, he will chime in soon I expect, and I have a mate there at Devonport who could help you, he said the other day he has a real good magneto guy there in Tassie, sounded like the north coast area, where are you located?
regards
Mike

That is correct Jim. I replaced the carbon lead and still had the issue.
The flywheel did have quite a bit of play in the bearing so I have replaced the bearing on the flywheel side and replaced the old oil seal with a double lip one and the flywheel nut was slightly loose and allowed the flywheel to move back and forth a little. I will also check for movement in the camshaft when I put the gear cover back onto the pony motor.

I think I know who you are talking about Mike, he's located in Westbury if it's the same bloke I am thinking of. My mate rung him in regards to the magneto but I can't remember if he said he had one or not.
I'm located in Launceston and the dozer is down at the workshop in town. Will keep an eye on ebay as it doesn't hurt to have a spare.


The main issue i'm having here is that if you look at the attached image in the first post the new magneto timing gear has the 'M' mark in a different position in respect to the keyway compared to the old gear. We have no idea which timing mark to go by.

Regards,
Alex.

Hi Alex,
MMmm, maybe left/new gear is a chinese gear with the "M" mis-stamped to 8 O'clock position instead of 4 O'clock as per old gear.
You could time it the way shown in the scans below.
Cheers,
Eddie B.

Thanks Eddie, I'll take those in and see if we can work something out. The new gear is a genuine cat part 2A4144.
Regards,
Alex.

Sounds to me like he did get rid of the carbon lead...

The gear breakage sounds related to a thread I read recently about a loose flywheel causing breakage of the magneto shaft.

"M" mark on mag gear should face front of tractor.

Hope you get it straightened out and I'm glad you got it where you can work on it.

Jim

[quote="Jim Davis"]Sounds to me like he did get rid of the carbon lead...


Jim[/quote]

Yes , Jim , My mistake , Misread it .

Hello I have a D4 7U 1959 if I remember right. It sat for about five years before I got it. I don't know if your pony is the same as mine . Im in Canada. The pony would start but only ran on one cylinder and would back fire and fart about . Wouldn't run at a very high rpm and not enough power to turn the diesel. After carrying on half assed running and backfiring etc it would finally settle down and run well enough to start the diesel. It also broke the rotor gear in the mag on one occasion.
Finally found that the gasket for the top of the pony engine to pony block which contains the intake manifold had shrunk up and wasn't sealing one of the intake manifold to block ports. So it had a lean mixture that affected both cylinders. It always needed about half choke to run at all until it warmed up . It may not be the cause of your problems but it did make mine run very well after I finally found it and replaced . I was just glad it didn't do damage to other parts while running it like that.