Posted by Matt Jordal on February 28, 2009 at 15:25:24 from (75.107.253.243):
In Reply to: More MD questions posted by BruceS. on February 28, 2009 at 13:59:49:
I"ve had my M diesel for almost eight years now and finished the restoration in June 2005. I love the tractor since the complete engine overhaul it has lots of reserve torque and is very very efficient on fuel. The engine runs at 75% load for 10-12 hours on less than six gallons of diesel. Back to your potential tractor before starting check the oil in the injection pump, there is a petcock for this purpose on the pump itself about an inch up from the bottom. You don"t want any diesel fuel in the oil, if there is the pump plunger is most likely worn. There are a few other causes for the fuel in the oil to. That oil is supposed to be changed at the same time as the engine oil. Scavanging pump in the injection pump could be worn or plugged, or the return stand pipe in tank could be cracked. Also check for excessive diesel in the engine crankcase oil. Once the engine starts it should run on all four cylinders within a minute or less, if it is missing on one or more cylinders the engine will puff white smoke everytime the missed cylinder goes through the exhaust stroke. If the engine continues to puff white smoke (miss) on one or more cylinders the missing cylinder has low compression. Caused either by bad rings, leaking valves, or faulty injector. If the engine has execessive blow by from the crankcase vent tube bad rings are indicated, the starting valves can be checked by with the engine running on diesel cycle carefully loosen the spark plugs and check for excessive leakage. If you can"t determine which cylinder is missing, if any, with the hood removed you can slightly loosen the bleed screws on the injectors one at a time till you locate the injector that least affects engine operation, this does the same as pulling plug wires on a gas engine. One word of caution though on loosening the bleed ports, stand to the left on the injector your testing, as the fuel will spray to the right under high pressure. As with any engine check for oil leaks, coolant leaks, oil pressure, temperature, coolant level and condition, also check the fuel pressure gauge on the injection pump if the engine is running poorly. The gauge should be in the white range at above half throttle, if it isn"t the fuel system isn"t getting the fuel it needs, either clogged fuel filters, water trap screen, or intake pipe in bottom of fuel tank. Also if the engine is running poorly check for the air cleaner inlet tube being clogged, as diesels require huge amounts of air to run properly. You may also not be getting a spark due to the magneto cut off switch located in the front end of the intake manifold, on the diesel cycle the switch grounds the magneto to prolong plug life, you can disconnect this wire at the mag and check again. The mag is the same as the other letter series EXCEPT it turns counterclockwise. I hope this helps with your concerns, or questions. If you have any other questions you can also email me directly.
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