D6 Magneto Question

I am still have a magneto AMERICAN BOSCH CATERPILLAR for D6 and he has good spark but he is missing the gasket cap

Correct magnetos for the D318 are....
American Bosch MJK 4/2 360 D410
Wico XH-2839
Fairbanks Morse FMXF2B36D

Correct magnetos for the D318 are....
American Bosch MJK 4/2 360 D410
Wico XH-2839
Fairbanks Morse FMXF2B36D

Thank You so much for the information. Checking the magneto on the machine, it is a MJK 360C 410, NOT a "D410" as you say is correct for the machine. That would explain it not firing at TDC or thereabouts. It was firing about 20 - 30 degrees before TDC and, of course, just kicked every time instead of trying to run. If the owner wants to invest the cash, I'll be looking for a 360D unit. The machine has been sitting in the weeds with the hood off for many years, but the diesel is not locked-up. The carburetor was badly corroded and may not function even though I did manage to free the float and poke the crud out of the jets. I will need a magneto just to get to the next potential trouble spot.

 Thanks again,

Jeff

Had that trouble on my 75, damn thing wouldn't start, timing was always off, reset it and off again, took mag apart, RC-2Q, found out it had too long of an armature shaft, about only an eigth inch but enough that it held the impulse far enough away that it would scrape past the impulse trip latch on the mag housing and throw the timing off and not trip the impulse, had Mark's Magneto put the correct, shorter shaft, armature in and worked great.

The "C" model is fine. They came in "A,B,C,D" models as time progressed.

I appreciate the update. So you say the C version is also correct. That leaves me scratching my head RE the consistant early firing that prevents it from starting. Any additional thoughts?

Thanks,

Jeff

Timing gear is off a few teeth? Installed wrong at one time?

WOW! That could get nasty in a hurry. The machine does not show any sign of being reassembled and then refusing to run. It, according to the sketchy memories of some family members, worked for years at the ranch, and was then set aside. Some time later, an attempt was made to get it running, and a replacement magneto was offered by a fellow Cat owner nearby. The thing refused to start and the fellows gave up in disgust and left all the sheet metal scattered around in the brush. Guess I'll just keep thinking on the subject.