7.4 MPI Oil Change Issue

Discussion in 'General Discussion' started by Dumb_Boater, Dec 3, 2021.

  1. Dumb_Boater

    Dumb_Boater New Member

    9
    Feb 27, 2010
    Vancouver, BC
    1999 270 Sundancer
    7/4 MPI w/Bravo 3
    My 7.4 MPI is supposed to hold 6.6 litres, but I only got 4.3 out of the dipstick tube with an extractor when I did the oil change. I know there was 6.6 litres in there because I just rebuilt it and put that much in there. I am reading on the forums that this is a common issue.

    Any ideas why I can only get 4.3 litres out of the dipstick tube? Is there that much oil caught up in the engine and oil cooler, etc.?
     
  2. boatrboy

    boatrboy Well-Known Member SILVER Sponsor

    Oct 3, 2006
    Orange, CT
    2006 340 Sundancer
    Twin 8.1 Horizons with V-Drives
    Your signature says you have a 496 but you are asking about a 7.4 mpi which is different - which is correct?

    My 7.4 mpi always drained close to the 8 qts so I’m not sure why your only getting 7 qts (assuming after filter drains too).

    Sorry I can’t help much but just wanted to bring to your attention the discrepancy so others can help on the correct engine.
     
  3. Dumb_Boater

    Dumb_Boater New Member

    9
    Feb 27, 2010
    Vancouver, BC
    1999 270 Sundancer
    7/4 MPI w/Bravo 3
    Thanks for pointing that out. That was my previous boat.
     
  4. Chris-380

    Chris-380 Well-Known Member

    Jan 20, 2019
    Pontoon Beach IL
    2000 380 Sundancer
    7.4L Horizon w/V drives
    I had a vacuum hand pump and I got the same as you out of my 7.4L. When I switched to the jabsco pump on the bucket, I get almost all out.

    Do you use the entire dipstick with the garden hose connection or use the small tube that’s slides in the dip tube.

    I also assume that you get the engine good and hot so the oil flows easier

     
  5. Dumb_Boater

    Dumb_Boater New Member

    9
    Feb 27, 2010
    Vancouver, BC
    1999 270 Sundancer
    7/4 MPI w/Bravo 3
    I brought the engine up to operating temperature on the trailer with the muffs. I first sucked it through the tube by clamping a 3/8s hose on it, then after I got as much as possible I put the smaller tube in to check and didn't get anymore. Both sucked air bubbles after I got the 4.3 litres out.
     
  6. HawkX66

    HawkX66 Well-Known Member

    Jul 27, 2020
    SE Virginia and NH
    "Tread Knot"
    1997 Sea Ray Sundancer 290DA

    2020 F350 6.7L
    454 L29 Carb w/ Bravo III
    Same thing happened with mine. I'm sure it's because the dipstick tube didn't get positioned correctly. It's too far off the bottom of the pan. I'm installing a drain plug hose and will run it up the side of my motor where I can connect a pump.
     
  7. Dumb_Boater

    Dumb_Boater New Member

    9
    Feb 27, 2010
    Vancouver, BC
    1999 270 Sundancer
    7/4 MPI w/Bravo 3
    I'm thinking the same thing, thnx
     
    HawkX66 likes this.

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