Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › 370B Bosch Fuel Pump

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  • February 19, 2022 at 10:34 am #127141

    Richard Sosdorf
    Participant
    Vessel Name: Jenny Matt
    Engines: Cummings 370B
    Location: Cape May, NJ
    Country: USA

    I have 370B’s (2008 Recons) in my 31 Blackfin.  A few seasons ago I lost 90-100 rpm’s at WOT and under load on the starboard motor.   Had a few mechanics go over everything and no could come up with a cause.  Well, I pulled off my coolers for service and noticed a bracket on the bosch P7100 pump is broken and missing.  Looked a few past pictures and it’s been missing from sometime.  From what I could find the bracket is some type of stop for the fuel shut off.  I know the solenoid stops fuel flow but is it possible with the stop missing its somehow the lever over rotating is affecting flow thus causing my loss in rpms.   What is very odd the bracket on my port motor is cracked in the same spot as the other one was broken off at.  Does anyone know where I can get replacement brackets and possibly why they would fail like they are. 

     

     

     

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  • February 20, 2022 at 6:00 pm #127179

    Francis Valerio
    Participant
    Vessel Name: overslept
    Engines: Twin 4BT CPL741
    Location: Massapequa Park, New York Long Island
    Country: USA

    Richard

     

    A suggestion, is the broken off piece in the bilge or under the engine?

     

    If you can locate it have someone weld it for you.  You can take the one off the other engine to use as a guide or “jig” to weld it back to proper spec.  As you are doing this you can have the crack repaired as well that you mentioned.

     

    Good luck

    February 20, 2022 at 3:59 pm #127178

    Tony Athens
    Moderator
    Vessel Name: Local Banks
    Engines: QSB 6.7 550 HP
    Location: Oxnard, CA
    Country: USA

    All I can say is figure it out buy either making the parts or finding parts at  a pump shop with some old Pumps.–I cannot supply them as then I’d be in the same position–A P7100 pump in need or parts or something clever to make it all work right.

    February 20, 2022 at 1:38 pm #127175

    Richard Sosdorf
    Participant
    Vessel Name: Jenny Matt
    Engines: Cummings 370B
    Location: Cape May, NJ
    Country: USA

    Tony – Yes, the boat easily hitting 3090 to 3100 on fresh tuned props.   The boat pops up on plane easily and runs great.   Little to no smoke getting on plane and nothing while running. 

    February 20, 2022 at 8:18 am #127167

    Tony Athens
    Moderator
    Vessel Name: Local Banks
    Engines: QSB 6.7 550 HP
    Location: Oxnard, CA
    Country: USA

    These are the best views I have of the p7100.. Maybe you can figure out something from them..  Not sure what stops what as I’ve never had the issue to deal with.  Only on the 4BTA have I seen a bracket break an that was many yrs ago. Brackets & parts ?? Maybe a local pump shop??       

     

    RPM loss over time is just about always engine loading–Did you engines ever make 3100+ and make it easy?

    February 19, 2022 at 1:06 pm #127149

    Richard Sosdorf
    Participant
    Vessel Name: Jenny Matt
    Engines: Cummings 370B
    Location: Cape May, NJ
    Country: USA

    Here’s the best picture I have.   Not a lot of room between the motors to get any better of pictures.   

    February 19, 2022 at 11:24 am #127146

    Tony Athens
    Moderator
    Vessel Name: Local Banks
    Engines: QSB 6.7 550 HP
    Location: Oxnard, CA
    Country: USA

    Stand back 2-3 ft and re-take  the pics–re-post

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