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Tractor Talk Discussion Board

Re: MF 175 diesel won't start


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Posted by gbs on December 26, 2021 at 16:10:52 from (71.217.176.8):

In Reply to: MF 175 diesel won't start posted by Keith Molden on December 26, 2021 at 10:16:10:

As shown the 3166 filter has whipped more than one mechanic due to the sealing ring being put into the filter grove instead of the filter housing. On a 175 the tank is above the lift (primer) pump and filters so you should have a free flow of fuel to the filter housings when the tank shut off is open, if not try pumping the primer handle on the lift pump you may have to turn the engine a little to get the pump lever to work. If you can't get a good flow of fuel some of the lift pumps had a strainer under the cap held on by a small screw or bolt in the center of it which could be stopped up or the supply line back to the tank is stopped up. Once you get fuel to the filters open the lower bleeder screw on the injection pump continue to pump the primer handle until an air free flow of fuel is coming out. Close that crew and open the upper screw on the head of the injection pump and repeat the bleeding process. Once you have bleed the injector pump move up to the injectors and loosen at least 2, all if possible all 4 of the injector lines about 3/4 of a turn using a 5/8 open wrench. Open the throttle wide open make the sure the shut off cable is in the on position, turn the engine over with the starter after several revelations fuel should start leaking at one or more of the loosened line nuts. If you can't get fuel to the injectors the injection pump shut off is stuck in the off position requiring the pump to be serviced. If fuel start leaking at the injector line nuts, stop turning the engine retighten the ones that are leaking, turn the engine again a few more turns until fuel start leaking from either of the two remaining, stop turning the engine and tighten the remaining lines it should start on your next try. ( NOTE; BE CAREFUL ) as it may start on 2 cylinders if it does shut it OFF ( DO NOT COME IN CONTACT WITH THE FUEL COMING FROM THE INJECTOR LINES WHILE RUNNING THE ENGINE AS IT IS UNDER HIGH PRESSURE, 2500 PSI EVEN THOUGH THERE WILL BE ONLY A SMALL VOLUME SPRAYING OUT) and retighten the remaining lines. AGAIN BE CAREFUL WHEN WORKING ON THE HIGH PRESSURE LINES GOING TO THE INJECTORS.


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