I'm always amazed at the size difference between the RD-6 and RD-7, that one extra piston combined with the much better balance of a 4-cylinder layout really makes a difference. I also love these 9G machines (I'm assuming that's what this one is) for that "Y" shaped dash and their rather "unstyled" styling, if that contradictory statement makes any sense lol 😂👍
tractor number 9G5615WSP. I'm getting it running to transfer it to it's new owner. Dad had an extensive collection and I just can't keep them all. Keeping the 17A so I'm all set for D7 work. Hope to have the diesel running tomorrow and perhaps put it on a trailer this week (June 2024). Yes, that old dash is a classic.
I had always thought that 3-cylinder motors were naturally balanced but 4-cylinders are naturally unbalanced? as the newer d7 has a big counterrotating shaft for balance? JD seems to do their small 4 cylinders with 2 counter-rotating shafts. or is this just a more a sine of technology advancement.
Just what I needed to see. Working on mag timing. I need to get my 1H D8 running after 3 or 4 years. It was running then but I have not seen any spark yet. I am going to clean the points again and try. I have another mag but I have hesitated to get involved with timing.
If your magneto is off the machine, I would recommend giving it a simple bench test: rig up an old spark plug and give it a few quick turns; complete the circuit on a welding bench or the magneto case itself. The impulse coupling should engage and you'll know if you've got good spark. Love the 1H and 8R series. Best of luck to you.
