Bleeding a Diesel Engine Question.

Discussion in 'Off Topic!' started by Cargodog, Mar 25, 2020 at 12:26 PM.

  1. Cargodog

    Cargodog Active Member

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    3 cyl. yanmar was run out of fuel twice. Have bled filter housing while replacing filter. My question is when bleeding lines at the injector nozzle b-nuts do I open the compression release lever to keep the engine from starting with a line open? Thanks.
     
  2. grizquad

    grizquad Well-Known Member Founding Member

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    No, leave compression lever in start position. I usually put a battery charger on the unit so while you are bleeding, it keeps turning. You want the engine to start. Usually its a 17mm open end wrench to bleed injectors. Start at injector closest to beginning of fuel rail and while cranking, crack the injector line (at top of injector) until you get solid fuel, NO bubbles. Close and go on to next till end, by then it should start if filter and fuel tank are full. I used to lay a rag under fuel line to keep mess down. If you are not getting fuel, your fuel solenoid may be bad. Hope this helps. Steve
     
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  3. firewater

    firewater Member Founding Member

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    Agree with Steve completely.Also you might do it a little while then pause so starter doesnt get hot if it takes too long.Mike
     
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  4. Cargodog

    Cargodog Active Member

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    Thank you both Mike and Steve. Will get together with my son this weekend and see if it comes back to life with your help. Seems these things always happen just after the dump truck drops off 8 yards of topsoil!!!
     
  5. grizquad

    grizquad Well-Known Member Founding Member

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    Let us know how things turn out. Those little Yanmar's are bullet proof, just a PIA when you run them out of fuel. One more thing, if you know fuel system is good, and it won't start, look at smoke stack when you are trying to start, if white smoke is not coming out, look at fuel solenoid, the older ones were always burning out.
     
  6. 635 G

    635 G Mega Poster

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    I used an auxiliary electric pump to help prime my injectors when we lived on a boat, it pushed right past the lift pump, small electric pump from auto zone--worked well was also good for filling my Racor primary filters, only had to bleed two cylinders
    Perkins 6-354 turbo
     
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  7. Hey Hey Hay

    Hey Hey Hay Member

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    If it starts that’s even better just start tightening the lines up and it will smooth out and be good
     
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  8. firewater

    firewater Member Founding Member

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    Well I had an International that got algae .Had to use algaeicide ? sp. and used a boat fuel tank and line so I could pump clean fuel past the injector pump so I would not burn up the starter.Mike
     
  9. 635 G

    635 G Mega Poster

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    Had a day tank on the boat, polished all fuel that was going to be used in engines and gen sets prior to moving the boat -did 30,000 miles without ever having a fuel problem--real important had a clear container & checked all fuel before fill the tanks, in the islands you had a risk of getting filthy fuel--went from Nassau, Bahamas-to Ft. Lauderdale to clear customs & then to Jacksonville 660 miles / 315 gals --not bad for a 49' trawler--we had a 2000 mile range
     

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