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  1. R

    overheated Merc 140 (3.0) repairable?

    Took it out yesterday, and it promptly overheated in the middle of the lake.. was running at about 1500 rpm for about 15 minutes when it showed about 240 deg.. we turned around and got her back to the dock. by that time the gauge was well passed the 240 mark (guessing 260) was getting some...
  2. R

    What years of Mercuiser 3.0 are interchangable?

    I may be needing to find a shortblock for my '86 140 hp. I think '90 and down had a 2 piece rear main, and '91 and up was a one piece. what else do I need to be aware of?
  3. R

    Merc 140 Leaking head gasket

    got an '86 with the Mercruiser 140. on the pushrod side of the block I have water leaking from the head gasket area between Cyl 2 and 3 and behind 4. It bubbles out, not a big stream. I also have water in the oil. I am thinking the head gasket is leaking both internal and external. any...
  4. R

    Milky Oil-- 3.0L

    Hi all. I am new here. I bought this Glastron with the 140 HP 3.0L 4 cyl last year. Runs great, but now I discovered I have water in the oil. So I know something is cracked. I have heard that you can pressure test these. I have done searches and not found any info on how to do this. FYI, I...
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