12/15/2023 0 Comments D7 dozer pony motorOnce my diesel fires, I found a way to drain the bowl with a petcock, takes too long to run out, then I know nothing can drain into the oil. I'm also not sure if the diesel needs to spin to circulate coolant, so you may want to check that prior to firing it up and letting it run without spinning the diesel, on my D7, you have to spin the diesel or you will overheat the pony. When it does, it should disengage the pinion by centrifugal force, however, I keep a hand on the throttle linkage and am always ready to stop it from overspeeding the pony, another little thing to watch for.ĪLso, I'm not familiar with the D-6's to D-2's starting engine, but the principle is the same. Once the pony is running, make sure the diesel compression lever is on start, then engage your pinion, you should have a pinion lever and a clutch lever, disengage the clutch and engage the pinion, then engage the cltuch and the diesel should spin, if cold out, let the diesel spin awhile, pinion should stay locked in, (if not it needs adjustment or something is wrong ) always wait for oil pressure to build up, you can turn the compression lever to half or run after a little while, the pony may die bog down, sometimes you might back off the compression and try again, but eventually the diesel will build up heat, and will not resist as much, and it will spin with compression on, then open the fuel and it should start popping, you'll see some white smoke and if its got good compression it will fire right up. ![]() Reason I mention this is, starting motors can be problematic if not taken care of, and the gasoline in the oil thing will certainly thing the oil to the point where you could toss a rod. The fuel tanks often contain lots of rust and your fuel supply can get clogged easily, that and keeping your magneto & ingition system firing a hot spark, champion plugs don't seem to perform well from what many people have said and used solid core conductor plug wires, with copper wire, not like modern plug wires. little motors, keep your oil clean, the carburetors on these can and do leak down gasoline, which will thin the motor oil, so always be on the lookout for that, if you do not drain the bowl down somehow, let it run out of gas by shutting the petcock on the sediment bowl or tank after the diesel fires. One thing to remember about these, they are not high tech. Master clutch should be in neutral, transmission in neutral, ( when the diesel is running, and if left unattended or used for stationary work, leave the transmission in neutral and the clutch engaged, keeps it from accidentally popping into gear and I think is less wear on the pilot bearing, something along those lines, again don't quote me ) ![]() Principle is the same as the JD 720 I'm sure, that ought to be helpful experience. Re: D4 CAT PONY MOTOR STARTING INSTRUCTIONS in reply to Bryan Kneebone, 04-10-2006 07:10:41
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