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1990 454 / 7.4 Mercruiser Oil Capacity

Discussion in 'General Maintenance/Repair Questions' started by Craig Lescombe, Oct 17, 2020.

  1. Craig Lescombe

    Craig Lescombe Member

    45
    May 15, 2019
    Windsor, Ontario, Canada
    1990 350 Express Cruiser
    454 CID / 7.4 Liter Twins
    Hello Folks - Had my local marine tech change the oil on both engines upon purchase of new boat to me last year. - 1990 Sea Ray 350 Express Cruiser with twins

    I instructed him to put in 7.57 litres / 8 quarts.

    Yet this showed way overfilled on dipstick on both engines- had to remove approx 2 litres / 2 quarts from each which brought each dipstick to top of fill mark.

    Owners manual ( Mercruiser 454 Service Manual #15 - Section 1b-10, page 23) reflects as follows:

    7.57 Litres / 8 Quarts With New Filter
    or
    6.60 Litres / 7 Quarts With New Filter - For Generation V Engines (Engines with Cast Aluminum Rocker Arm Covers and lack of engine block fuel pump mounting pad)

    I was never aware of / had read of a 6.60 litre / 7 Quart Gen V configuration

    Makes sense if my engines are Gen V but how can I be 100% sure?
    I think I read Gen V came out in 1992 whereas my engines are 1990.

    Can anyone assist?


    Engines Are:

    7.4L MIE W/HURTH GM 454 V-8 1989-1992 - 0C391564 THRU 0D715493

    Thanks - Craig
     
  2. Ricochet

    Ricochet Active Member GOLD Sponsor

    144
    Mar 10, 2009
    West Michigan
    1990 390 Express
    454 Mercrusier
    Craig,
    We probably have the same motors, you are only going to get 6 quarts of oil in them. The published amount is for a dry motor. I have never been able to get more than 6 quarts out when changing my oil.
    Rick
     
  3. B BARKER

    B BARKER Active Member GOLD Sponsor

    162
    Apr 20, 2014
    TENNESSEE RIVER- CLIFTON,TN
    1974 CENTURY ARABIAN 454 CRUSADER MARINE V-DRIVE.. ALSO 1987 SEA RAY 390 EXPRESS CRUISER..
    454 MERCRUISER 340 INBOARDS
    Same here my 87 models hold 6 also..
     
  4. Craig Lescombe

    Craig Lescombe Member

    45
    May 15, 2019
    Windsor, Ontario, Canada
    1990 350 Express Cruiser
    454 CID / 7.4 Liter Twins
    Thanks!
     
  5. Craig Lescombe

    Craig Lescombe Member

    45
    May 15, 2019
    Windsor, Ontario, Canada
    1990 350 Express Cruiser
    454 CID / 7.4 Liter Twins

    Thank You!
     
  6. DreamstateSeven

    DreamstateSeven New Member

    8
    Jul 15, 2019
    Toronto / Lake Ontario, Canada
    1990 Sundancer 270
    7.4L Mercruiser Bravo 1
    With my 1990 454, there was a bunch of oil in the oil cooler, and the hoses that route up to the oil filter (that sits above the engine). Make sure to drain that too! I forgot the very first time I did it. :)

    I wasn't sure if this was part of the the oil quantity measurement that the factory manual said.

    Either way, I also only needed about 6.5 litres on my most recent change. But I also flushed the engine with a bit of oil during the change.
     
    Craig Lescombe likes this.
  7. Air O'Nautical

    Air O'Nautical Well-Known Member

    Feb 5, 2008
    Stamford CT
    1995 400EC. Raymarine E80,4kw dome, Garmin 235 gps,
    2013 7.4L Mercruiser Blue water.
    Hurth straight shaft 630's,
    Westerbeke 7.0 BCG
    I built my motors from new and initially they took more oil.
    I’ve only ever been able to extract 6+ qts.
    Check your oil level is good...then, replace the amount you’ve extracted...
    Simple.
     
    Last edited: Oct 18, 2020
    scoflaw and Craig Lescombe like this.

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