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compression on mercury

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  • compression on mercury

    NEED HELP, DOES ANYONE KNOW WHAT THE FACTORY COMPRESSION SHOULD BE ON A 1995 200 MERC I HAVE BETWEEN 95 AND 100 ON EACH CYLINDER AND THEY ARE TELLING ME THAT THE MOTOR NEEDS MORE COMPRESSION. HELP PLEASE, ALSO IF SOMEONE HAS A MANUAL FOR THAT MOTOR IM WILLING TO BUY IT THANKS DAVID

  • #2
    Sounds low to me. Are you doing a wet or dry compression test? Are you pulling only one plug at a time? Are you giving it full throttle when cranking the motor? Are you cranking the motor over for at least 4 full cycles?
    [br]Michael R. Delgado[br]1972 Mako 22[br]http://classicmako.com/forum/topic.asp?TOPIC_ID=15745[br]1976 Mako 25[br]http://classicmako.com/forum/topic.asp?TOPIC_ID=18013&SearchTerms=mako,25[br]

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    • #3
      Hey Cubera, I don't know if that is too low but I've been told that what you need to be concerned with is consistency. Are all the cylinders the same? All the cylinders on my 150 Mariner tested at about 100. Motor runs great. Hope this helps.
      Tony C.[br]S. Daytona, FL[br]Boatless...for now[br]

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      • #4
        My '85 Merc. 150 blew an average of 125 on each cylinder. Of course that was the old 2.0 liter block. The '95 200 is a 2.5 so I'm not sure. I have yet to test my '02 2.5 liter 150.
        Brian[br]St. Leonard, MD

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        • #5
          cubera,

          Clymer's states that compression should be 110-120psi, with a max variation of 15psi between cylinders.
          Justus[br]\'93-211 Classic [br]Baton Rouge

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