Logo
Click forPleasurecraft Marine parts and manuals!
Results 1 to 3 of 3
  1. #1

    Default About to pull the trigger, please advise!

    So I'm about to buy a boat with a 2002 Sea Maxx 5.7L with 300 hours on it. The service manual says maximum cruising rpm is 3800. The engine data read out displays 155 hours at 4000-5000 rpm. The previous owner says he cruised at 4200 rpm and that PCM said it was "ok". I reached out PCM but of course they did not tell me it was ok, they just refered me back to the service manual.

    Does anyone have experience with a situation like this. I'm inclined to think its not such a big deal and myself have cruised above reccomended Rpmss in the past

    Does anyone think it's ok, only 155 hours not a big deal or run like H E double hockey sticks?
    thanks

  2. #2
    Join Date
    Dec 2006
    Location
    Chaumont Bay, N.y., USA
    Posts
    5,218

    Default Re: About to pull the trigger, please advise!

    Ayuh,.... A compression, 'n leak-down test will tell ya more 'bout the overall health of the motor, than an hour meter,.....

    Not awhole lotta difference 'tween 3800, 'n 4200,.....
    Any Grease is Better,... Than No grease at All....

  3. #3
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    9,190

    Default Re: About to pull the trigger, please advise!

    .........
    Quote Originally Posted by Maraian View Post
    So I'm about to buy a boat with a 2002 Sea Maxx 5.7L with 300 hours on it. The service manual says maximum cruising rpm is 3800.
    I would think that the service manual is suggesting a cruise RPM of 3,800.


    The engine data read out displays 155 hours at 4000-5000 rpm.
    A sustained 4k to 5k rpm will typically shorten engine life!

    The previous owner says he cruised at 4200 rpm and that PCM said it was "ok".
    Again, a sustained 4+K rpm will typically shorten engine life.

    I reached out PCM but of course they did not tell me it was ok, they just refered me to the service manual.
    And the service manual says ?????

    Does anyone have experience with a situation like this. I'm inclined to think its not such a big deal and myself have cruised above reccomended Rpmss in the past.
    Understand the differences between suggested OEM WOT RPM, and cruising RPM. These are not the same.

    ...... WOT RPM is much higher, and is used exclusively to determine if the engine is geared and propped correctly.
    ...... Cruise RPM should be enough to get the hull on top of the water Plus Some..... but not excessive.

    Does anyone think it's ok, only 155 hours not a big deal or run like H E double hockey sticks?
    thanks
    Do you have a qualified Marine Surveyor involved? If not, perhaps you should!
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP's

    Please... no PMs! Post your questions on the forum.

Similar Threads

  1. Please advise location of Serial # on my 9.8 hp Merc rope-pull outboard
    By Old Merc in forum Identifying Model / Year / Horsepower
    Replies: 6
    Last Post: 08-06-2013, 12:00 AM
  2. Mariner 28 hp pull start wont pull
    By azza01 in forum Mercury Mariner Outboard Archive
    Replies: 3
    Last Post: 07-10-2007, 07:00 PM
  3. Pull start wonbt pull
    By brigan in forum Archive 2003-2007
    Replies: 2
    Last Post: 09-13-2006, 11:30 PM
  4. Pull start wonbt pull
    By brigan in forum Mercury Mariner Outboard Archive
    Replies: 3
    Last Post: 08-03-2006, 02:51 AM
  5. Pull start on 92 Envinrude 8hp Wonbt Pull
    By Pete camelo in forum Johnson Evinrude Outboard Archive
    Replies: 2
    Last Post: 05-03-2004, 03:31 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •