Re: 674 INTERNATIONAL DIESEL FUEL SUPPLY PUMP ?

Posted by Fromjb2 on September 07, 2006 at 19:27:02 from (69.198.143.165):

In Reply to: 674 INTERNATIONAL DIESEL FUEL SUPPLY PUMP ? posted by Scotty1 on September 06, 2006 at 19:50:02:

Hi Scotty, KB is correct the German D239 Diesel engine will smoke and slobber oily fuel if it is left idling to long. Yours is going to engine oil smoke for for a while until the new rings get seated.
How many hours does the hour meter show?

Here are things I would check:
1) The proper adjustment of the STOP/START/RUN control rod on the injection pump. As you probably know when the STOP/START/RUN lever on the dash is about 1/4 of the way up to the RUN position that this is the START position and it gives the injectors extra fuel just like a choke on a gas engine and in this position the tractor will smoke really bad. Next when the lever is in the RUN position the control arm on the side of the injection pump should be against the HP adjustment screw. Now check if this adjustment screw still has the wire seal on it. If the seal is gone chances are someone in the past has broken the seal and adjusted the HP adjustment screw out to increase the HP. We would do this on our 684 when we were using it to chop corn because the D239 would produce over 70HP with the screw turned out a couple turns. When the HP is adjusted upward the engine will smoke bad when it is idling. One way to correct this is to push the RUN lever down about 1/2 inch from top and this reduces the amount of fuel going to the engine and less smoke. We would do this when we used the 684 on the wood splitter or using it for light work.
2)Injection pump timing: a quick test of timing is after the engine is up to running temp. shut it off and then start it again if the engine starts right up with less than a rev of the crank then the timing is good, if it requires 3 or more revs then it is probably timed to slow and will smoke and slobber bad. If the engine kicks back on the starter it is timed to fast.
3)I am suspicious of that electric fuel pump putting to much pressure on the injection pump and causing over fueling and hence smoking.
Normally these tractors were gravity fed but they had a habit of getting junk in the fuel tank and restricting the fuel flow to the fuel filters. If you take the fuel line off at the inlet to the first fuel filter the fuel should flow the full of the pipe. If it doesn't there is a problem usually requires taking the outlet fitting out of the fuel tank on both sides. Don't let fuel tank lever get below a 1/4 tank or you could have fuel feed problems going up steep hills.
4)Make sure injector return line to the fuel tank is not clogged.

Another hint, add Diesel fuel conditioner or a tablespoon of engine oil every time you refuel the tractor. This is required to lube the front lip seal on the drive shaft of the injection pump. 40 years ago when the Bosch injection pump was designed Diesel fuel had a higher sulphur content thus providing good lubrication to the injection pump.

Hope this helps
JB2

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