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  • Overheating and diesel if problem

    First time posting in this forum but I’m hoping to get some good information...I just bought a 1984 sea ray seaville with the mercruiser 140 and aloha 1 gen 1 out drive the boat has been very well taken care of and has only been in the water for 5 years of its life, and is a 1 owner boat, however we’ve ran into some issues

    first time out the boat started to over heat so we shut it down let it cool for a while then brought it home, after some looking we found the thermostat was rusty and seized open which wouldn’t cause the over heat but the impeller wasn’t pumping so we replaced that went back out and it was good for most of the day then started to over heat again, got it back home and found the water pump on the engine was worn out pretty bad and found the water passages on the riser and the spacer to be completely gunked up however had good water flowing out of the exhaust manifold before those spots took the boat out after and real good clean and was out for about 7 hours tubing and such and at the end of the day temp climbed to about 185 and we shut it off for a bit....so that’s our first mystery we are thinking more debris came up stream and clogged things up again or the exhaust manifold wasn’t flowing water as good as we thought it was so my question is is it possible to use that marine flush that’s meant for eating away corrosion and gunk inside the cooling system to flush out the passages?

    second issue was when we were last out the boat was shutting off very weird it was gurgling and trying to stay running several seconds after shutting the key off then once we restarted we found that the boat didn’t want to go under load it was just dying out, when we got home we found a little dibree in the fuel screen and the filter itself was crushed, also found some people saying run 93 but we’ve been running 87 octane, could the filter and the low octane gas be the hole problem we are having and what else should we look at while we are at it?

    the boat was originally ran in salt water but was flushed and winterized every year with documents to show us what shop did it however we run the boat in freshwater now

    any help would be greatly appreciated!

  • #2
    first, welcome aboard

    second, with any new to you boat, much less one that is 37 years old, you need to do all the maintenance to it prior to using it.

    Third, service your points. your timing is off which will lead to run-on. that last little gasp as the motor dies is the motor running backwards and sucking in water from the exhaust.
    Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

    1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

    Past Boats
    1970 Wooster Hellion - Merc 9.8
    2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
    1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

    What’s behind you doesn’t matter.Enzo Ferrari

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    • #3
      Originally posted by Scott Danforth View Post
      first, welcome aboard

      second, with any new to you boat, much less one that is 37 years old, you need to do all the maintenance to it prior to using it.

      Third, service your points. your timing is off which will lead to run-on. that last little gasp as the motor dies is the motor running backwards and sucking in water from the exhaust.
      Thanks for your response it’s funny you say that cause last time we were out and it kept running after the key was off for a second the motor ended up getting hydro locked in cylinder 4 and we had to remove the plugs crank it and then change the oil when we got home and replace the fouled out plug so on top of the fuel issue from the filter we need to replace or clean the points and check timing?

      Comment


      • #4
        Yes, check timing
        Other things that can cause it to diesel; if its running rich and if idle is to high.
        94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
        95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
        07 Seadoo GTX
        Merc Adults Only VP Adults Only
        G-Dad always said "First Liar doesn't stand a chance"

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        • #5
          Originally posted by alldodge View Post
          Yes, check timing
          Other things that can cause it to diesel; if its running rich and if idle is to high.
          It idles around 1000 rpm sometimes a bit lower around 900...and it seems to run a bit lean the plugs are showing more white in color then black and I think it’s running lean from the possible timing problem

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          • #6
            Also as far as timing I’ve read I’m looking for 8 btc but not sure what my dwell should be on my points and I’m also not sure how to do the timing on this engine I was reading that I have to jump the spark interrupt plug when I check my initial timing?

            Comment


            • #7
              Idle speed should be 650-700 in gear.
              Dwell 28-34
              Timing for the 140 is supposed to be 6 BTDC.
              As far as I know there's nothing to jumper on that era of motor.

              If you provide your serial number(s) it would help.
              Last edited by marc c; June 29th, 2020, 11:44 AM.
              1980 Sylvan Aluminum 18' Sportster I/O - Mercruiser 140, Honda 7.5 Kicker, Bennett M120 Tabs
              1974 Glastron V-179, Mercruiser 140
              1984 16.5ft. Alumarine Sealark side console with 82 Merc 50
              Manitoba, Canada

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              • #8
                Thanks for the info my timing was set at 2 atdc and found that the fuel trim for idle air mix was pretty lean only about half a turn out changed that to 1.5 turns as a base line until I get on the water, set idle at 850 since it’s out of the water and will drop a bit once it’s in the water and got the timing pretty close to 6 btdc and changed out my fuel filter that collapsed it started up faster then it has since I owned it and ran real smooth we will see how it goes on the water tomorrow

                Comment


                • #9
                  Originally posted by marc c View Post
                  Idle speed should be 650-700 in gear.
                  Dwell 28-34
                  Timing for the 140 is supposed to be 6 BTDC.
                  As far as I know there's nothing to jumper on that era of motor.

                  If you provide your serial number(s) it would help.
                  The serial on my engine is 6805225

                  is there a website I can put these serial numbers into to get all of these specs?

                  Comment


                  • #10
                    Originally posted by jtim108 View Post

                    The serial on my engine is 6805225

                    is there a website I can put these serial numbers into to get all of these specs?
                    Not that I know of but you could get Mercuiser Service Manual # 3 part no. 90-95693 it has all the info you need.

                    If you put your motor and drive serial number in your signature it would help going forward.
                    1980 Sylvan Aluminum 18' Sportster I/O - Mercruiser 140, Honda 7.5 Kicker, Bennett M120 Tabs
                    1974 Glastron V-179, Mercruiser 140
                    1984 16.5ft. Alumarine Sealark side console with 82 Merc 50
                    Manitoba, Canada

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                    • #11
                      Sign up today
                      You can read service manual #3 online at www.boatinfo.no .

                      Like to reenforce the point Scott made earlier that a new to you 37 year old boat needs all the maintenance gone through. The problems will keep adding up and you will find some things that are expensive if left until they fail. Not to mention the part where you have to walk back or the boat sinks.
                      17 Foot '90 Bluewater
                      Alpha 1 3.0 Merc - repowered in 2016
                      now - 4.3L Vortec - Alpha 1 GenII
                      Honda BF100L kicker
                      Engine custom - Transom 0D65328 - Drive 0D648864
                      If you ain't fishin, then yer working too much.

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