Welcome Guest - Sign Up today
Welcome Guest - Sign Up today
Store Links Mobile - Shop Now



Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old topics or hijack existing topics. Old topics of a technical nature are like a library book, Please do not write in them.

2. Old topics should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elses topic (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new topic of your own.

4. If you have a question for the original poster (OP) and the topic is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old topic.

5. By starting your own topic, you will receive the maximum number of views by forum helpers that may not even notice your question when its posted at the end of someone elses topic. And those answers will be specific to your particular issue.

6. Please do not post to topics that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any topic that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old topic.

7. Posting at the end of any topic is considered to be hijacking the original posters topic which in turn subjects the topic to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive topic asking you not to reply to old topics. The Red banner will read: Please note this topic has been inactive for 90 days. For the best results, please start a new topic.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
See more
See less

Identify Early Mercruiser

  • Filter
  • Time
  • Show
Clear All
new posts

  • Identify Early Mercruiser

    I have a Mercruiser motor that says 140 on the valve cover serial # 3247087

    I have found 140 - (GM 181CID 3.0L I4) 3332138 THRU 5157668

    The pre Alpha sterndrive is serial # 3250402

    I have searched for info but cant find anything for these specific numbers or a number range they fit in
    I just want to know what they are specifically and the ratio for the sterndrive
    I believe the boat is a 1972 SeaSwirl Cuddy

  • #2
    Missed it by that much....Your serial number fits more into the 1968 - 72 year range...You found the 72 - 78 year range. Below is the parts guide you should need for the engine,

    http://www.mercruiserparts.com/140-g...2-2508261-thru 140 GM 181 I/L4 1968-1972

    Here's your stern drive parts too, 120/140 1970-1977

    OEM Quality Gear Lubes And Greases Available @ iboats.com - BOAT SPECS - FORUM GUIDELINES - Volvo, OMC & Merc Stern Drive Technical Information For DIYers. - OEM VOLVO PARTS POWERED BY iBOATS.COM - All OEM Parts / Parts Lookup Now Available Through iboats.com -


    • #3
      I think its about time this boat retired, its my friends boat and theres nothing that is right on it, how it manages to run and stay on top of the water amazes me..
      Its one of those things I'm gonna end up married to untill death do us part, It looks like the boat is a little closer to death than me, if not, im in huge trouble....

      Hey, do ya happen to know the WOT range, she has a 23p prop that is a dog getting on plane i was thinking about a 19p but dont want her to take it out and blow it up if my guess is a little off...


      • #4
        Hey, do ya happen to know the WOT range,
        Ayuh,.... The closer you can get to 4600 rpms, the better it'll run,....


        • #5
          I switched from a 19 pitch to a 17,4 blade. got my hole shot better, rpm's at 4500 and lost no speed. Don't
          ​t dog out in the corners like it did with the 19. Mine is a merc 120 17.5 1985 chaparral.
          If ya can't fix it with a hammer,ya got yourself an electrical problem.


          • #6
            Sign up today
            I bought a used 19 but he has a 17 i set aside to see if she wants it for towing..
            Were taking the boat out today to see where I screwed up when I fiddled around with everything..
            If it dont plane right away, maybe Ill take back the 19 and see if he will swap me for the 17...