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1982 6/71 T inline 6 ,2 Stroke Diesel engine what's correct oil ?

Discussion in 'Engines' started by Racerx4772, Jul 25, 2022.

  1. Racerx4772

    Racerx4772 New Member

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    Motors have around 2000 hours , What's good oil pressure and water temperature ?
    Last edited by a moderator: Jul 25, 2022
  2. MBevins

    MBevins Senior Member

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    When on plane expect about 40psi
    At 1000rpm expect about 20psi.
    Normal temp is about 175-180.
  3. Racerx4772

    Racerx4772 New Member

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    Thank you , what's the correct oil for those motors and about how many quarts or gallons ?

    Jerry
  4. Capt Ralph

    Capt Ralph Senior Member

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    In warm climates, 40w, CF2 oil. Napa fleet, Shell T1. Delo 100.
    Must have that API CF2 Rating.

    Do not let 5psi oil pressure upset you at idle and hot. It is flowing oil.

    Check oil level cold. First thing in the morning. Then, just fill to the full line, not over.
    Just shuting down a few minutes and dipping the oil will make you think it is low. It is not.
    Lots of oil stays in the galleys for a long time.
    Last edited: Jul 25, 2022
  5. Racerx4772

    Racerx4772 New Member

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    Thank you !

    Jerry
  6. boatpoor

    boatpoor Member

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    Don't let the temp get over 180 or you'll be replacing a head.
  7. Racerx4772

    Racerx4772 New Member

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    Thanks , that's what I was concerned about .
    One motor is good on temp . I'm starting to think the wrong oil was used in the other one and causing that motor to have a higher temp . Probably best to change it and see what happens .
    Any idea of how many quarts or gallons of oil ?
  8. boatpoor

    boatpoor Member

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    Depends on the oil pan, but probably in the 6 gallon range.
  9. Capt Ralph

    Capt Ralph Senior Member

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    Oil is on the bottom of the list of things causing warmer operation.
    External pick-up/strainer, internal strainer, rubber raw water pump impeller, heat exchanger, coolant level, thermostat, proper temp sender-gauge working and exhaust dump can/shower head.
    An IR heat gun would be the first tool to pick up while shopping.

    An other thought, start asking around for a trust worthy Detroit tech.
    captholli likes this.
  10. MBevins

    MBevins Senior Member

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    That's about right.
  11. Racerx4772

    Racerx4772 New Member

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    Thanks for all the information !! Cars , motorcycles , houses , race cars , motor coach , campers , collision repair are my background Boats not so much . Only thing i know about that motor is it has fresh oil and looks clean - water pump impeller has been changed . Low rpm under 900 cooling temp on gauge good over that while under way it was showing above 180 . I do have my IR heat gun at the boat , was checking ac temps .
  12. MBevins

    MBevins Senior Member

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    Define "above 180"
  13. Racerx4772

    Racerx4772 New Member

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    gauge was reading 195 on that motor above 1000 rpm and cooled quickly under 1000
  14. MBevins

    MBevins Senior Member

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    If it's truly hitting that number you've got an issue that needs looking into. Perhaps heat exchangers are due for cleaning if your in salt water.
  15. Racerx4772

    Racerx4772 New Member

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    yes I'm in salt , prior owner had boat sitting 95%of the time although he ran the motors once a month is what he said . You can chemically clean those is that correct ?
  16. boatpoor

    boatpoor Member

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    What kind of strainer does it have?
  17. Racerx4772

    Racerx4772 New Member

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    lol , no idea .
    there is a strainer that I've cleaned for the a/c water line . Is it like that one ?
  18. Pascal

    Pascal Senior Member

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    195 while not destructive is very high at low RPM. It s ok for a DD to hit 195 when running at WOT but not at cruise and certainly not at “above 1000”

    Follow the list Ralph posted.

    how much water is flowing out the exhausts?

    if you have to clean the system, circulating barnacle buster thru the raw water circuit using a bucket and a bilge pump is one way to do it but if you re not familiar with diesels and don’t have the engine manual you should have a mechanic do it. You will learn a few things too.

    most boats have internal strainers like the AC but bigger. Hard to miss. Also check the outside water inlet for growth and debris. When is the last time a diver cleaned the bottom?
  19. Racerx4772

    Racerx4772 New Member

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    Good advice , ill call the mechanic # I have but may try to find someone else . The boat was hauled out a month ago for Survey and was very clean on the bottom . about a 15 minute pressure wash and new zincs were installed .

    Attached Files:

    chesapeake46 likes this.
  20. MBevins

    MBevins Senior Member

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    There are no strainers on the mains on this boat. It has the external ones that don't allow weeds and debris to enter, the name escapes me, perhaps Pascal will remind me.