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Water in Oil - Fix it or replace it-gctid395294

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    #1

    Water in Oil - Fix it or replace it-gctid395294

    I have a 98 2355 with a 5.0 vortec mercruiser (raw water cooled). I found water in the oil so it is in need of some major repairs. The hour meter is showing 450 hours and at one time must have sprung a leak on the cooling line because the front of the engine is showing major signs of rusting. I figure if it is just a head gasket, I'm looking at 6-700 bucks in repairs if I do the work with a mechanic type buddy of mine. I'm leaning toward a remanufactured 5.7 from michiganmotorz.com. Do you think I should just bite the bullet and go with the reman motor or save the cash and fix the old one?

    Anyone have experience swapping out motors without taking it to a shop? Doesn't seem like it would be too tough if I can get a fork lift but may be tougher than I'm thinking.

    Jason
    Tags: None
    #2
    The task of replacing the engine will be pretty much straight forward, but I think that you're jumping the gun here.

    It doesn't sound as though you have done any diagnostics as to determine just where/how the water entered the engine.

    Exhaust manifolds may be suspect.

    Water reversion from a faulty back-flow prevention flapper may have caused it.

    Perhaps a cylinder block/head leak-down test would be in order.

    IOW, I'd not assume that a head gasket failed, until you look into all other possibilities.

    Without diagnosing this, you'll run the risk of the very same thing occuring to the new engine.

    .
    Rick E. (aka RicardoMarine) Gresham, Oregon
    2850 Bounty Sedan Flybridge model
    Twin 280 HP 5.7's w/ Closed Cooling
    Volvo Penta DuoProp Drives
    Kohler 4 CZ Gen Set

    Please, no PMs. Ask your questions on forum.

    Comment

      #3
      jmcnair101 wrote:
      ... I found water in the oil so it is in need of some major repairs....
      Personally, I wouldn't make such a determination based on water in the oil. I would want to diagnose it further and see just what the problem is.

      jmcnair101 wrote:
      ...Do you think I should just bite the bullet and go with the reman motor or save the cash and fix the old one?
      Depends on what the problem is. 450 hours is 1/2 to 3/4 what the engine should last, from what I have seen. It may be worth fixing.

      Comment

        #4
        2850Bounty wrote:


        IOW, I'd not assume that a head gasket failed, until you look into all other possibilities.

        Without diagnosing this, you'll run the risk of the very same thing occuring to the new engine.

        .
        +1 rick is right on, do some basic diagnostics before just swapping the engine. Something could be wrong that isnt the engine itself, that will just ruin another motor for you. Your motor may also still be very salvagable!

        Comment

          #5
          Finally got the boat into the shop and here is what they say. Looks like it had a bad gasket but the boat has been sitting with salt water throughout the engine and everything is completely rusted. Here is the break down of what they say it needs. I'm looking for a replacement engine now.

          customer states water in the oil dipstick

          Payable By Customer

          Part No Make Dept Description Qty Price Each Total

          864651R01 MERC P LB 5.0L-RM 98-UP 1.00 3,368.75 3,368.75

          807988A 2 MERC P ELBOW ASY-EXHAUST 2.00 242.57 485.14

          860246A10 MERC P MANIFOLD KIT-EXH 2.00 296.24 592.48

          710-27-863726 LAN P GASKET 2.00 15.75 31.50

          33395 MERC P GASKET @2 1.00 13.35 13.35

          53728 MERC P SCREW 8.00 5.25 42.00

          93320A 5 MERC P RISER KIT-3 INCH 1.00 307.81 307.81

          807473A 1 MERC P GASKET SET 1.00 61.20 61.20

          862778A 1 MERC P BRACKET ASSY 1.00 20.36 20.36

          710-92-858050K0 LAN P OIL 4-CYCLE 55 GALLON 8.00 5.75 46.00

          710-92-858067Q0 LAN P HI-PERF GEAR LUBE 16 GAL 2.00 11.30 22.60

          806871 MERC P GASKET @5 1.00 8.10 8.10

          807252T 2 MERC P THERMOSTAT-160 1.00 36.26 36.26

          MISC NS POI spark plugs 8.00 5.50 44.00

          MISC NS POI water pump 1.00 54.95 54.95

          Parts Sub Total 5,134.50

          Code Tech Description Hrs/Qty Rate Total

          LABOR SHOP Teardown 2.00 125.00 250.00

          LABOR AC R&R Engine 4.00 125.00 500.00

          LABOR SHOP Install Longblock 6.50 125.00 812.50

          LABOR SHOP Install Wp/Low Oil 1.50 125.00 187.50

          Labor Sub Total 1,750.00

          Parts Total 5,134.50

          Labor Total 1,750.00

          Shop Supplies 10.00

          Sales Tax 568.80

          Grand Total 7,463.30

          Amount Due By Customer 7,463.30

          Comment

            #6
            To me, I woudl replace with a NEW Michigan Motorz crate engine, say a long block. However, just my opinion and how I think.
            Tony, Cape Cod, MA
            Vice Commodore Bourne Yacht Club
            1994 Carver 390 Cockpit Motor Yacht
            454 Merc Cruisers inboards
            "HOLODECK"
            2014 10' hard bottomed Dink powered by 3.3HP Mariner 2 stroke
            www.bourneyachtclub.com

            Comment

              #7
              If the motor can't be saved, I guess that is it.

              Comment

                #8
                trophyboat wrote:
                If the motor can't be saved, I guess that is it.
                If you do put in a new engine try to spring for a closed cooling kit.

                It will save you big time in salt water.

                Comment

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