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  1. M

    Inspecting Manifold

    1974 Merc 140. Combined intake/exhaust manifold.<br /><br />The manifold is off. How can I check for cracks that might allow water (from the raw water exit passages) to leak into the intake ports?<br /><br />Is this strictly a visual process (with or without dye penetrant), or is there some...
  2. M

    Obsolete Parts Houses

    Maybe this will help someone:<br /><br />My fuel line is No Longer Available. I was looking into fabricating one or having a hose made up when someone recommended I contact this "obsolete parts house":<br /><br />SeaWay Marine, Seattle, 800-332-0803<br /><br />They had it! They also said they...
  3. M

    Overheating--where should exhaust come out?

    1974 Merc 140, engine s/n 388...., stern drive s/n 390....<br /><br />Used to overheat only at high rpm, now overheating at all rpm. Overheats very slowly at idle, slowly at 1500 rpm, very quickly above 3000 rpm.<br /><br />I ran a simple test tonight, and have some questions about the results...
  4. M

    Merc 140 - Problem 2 - Ignition Coil gets Hot

    Merc 140 - Problem 2 - Ignition Coil gets Hot<br /> <br />This problem is related to "Merc 140 - Problem 1 - Engine Overheats at High RPM" which I just posted, but I believe it is an independent problem.<br /> <br />When running at 2500 to 4200 rpm, my ignition coil gets very hot. When I...
  5. M

    Merc 140 - Problem 1 - Engine Overheats at High RPM

    Merc 140 - Problem 1 - Engine Overheats at High RPM<br /> <br />Hello. Thank you in advance for any input.<br /> <br />My 1974 Mercruiser 140 holds 137 degF steady at idle, about 145-150 degF at 2500 rpm, but above 3500 rpm the water temp slowly climbs. I throttle back when it reaches 180-190...
  6. M

    Merc 140 - Problem 2 - Ignition Coil gets Hot

    Merc 140 - Problem 2 - Ignition Coil gets Hot<br /> <br />This problem is related to "Merc 140 - Problem 1 - Engine Overheats at High RPM" which I just posted, but I believe it is an independent problem.<br /> <br />When running at 2500 to 4200 rpm, my ignition coil gets very hot. When I...
  7. M

    Merc 140 - Problem 1 - Engine Overheats at High RPM

    Merc 140 - Problem 1 - Engine Overheats at High RPM<br /> <br />Hello. Thank you in advance for any input.<br /> <br />My 1974 Mercruiser 140 holds 137 degF steady at idle, about 145-150 degF at 2500 rpm, but above 3500 rpm the water temp slowly climbs. I throttle back when it reaches 180-190...
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