Logo
Results 1 to 2 of 2
  1. #1

    Default Mercruiser 5.7 Compression Test

    Hi all,

    In the process of purchasing a 2000 Sea Ray 260 with a Mercruiser 5.7 EFI. Engine has approximately 850 hours. The mechanic did a compression test first thing this morning before we launched the boat and got the following:

    Cylinder 1: 135
    Cylinder 2: 160
    Cylinder 3: 130
    Cylinder 4: 160
    Cylinder 5: 135
    Cylinder 6: 135
    Cylinder 7: 155
    Cylinder 8: 155

    They recommended we go out and run the boat and then retest afterwards. After running the boat, the mechanic rechecked compression and every cylinder came in between 145-160. We were able to run the boat at WOT and get a solid 4,600 RPM. The final word from the mechanic was that he had no concerns.

    My concern is whether or not the compression test should cause me any worry, even though after running everything seemed fine. Boat ran great during sea trial.

    Any input would be great.

    Thanks.

  2. #2
    Join Date
    Dec 2006
    Location
    Chaumont Bay, N.y., USA
    Posts
    5,220

    Default Re: Mercruiser 5.7 Compression Test

    My concern is whether or not the compression test should cause me any worry, even though after running everything seemed fine. Boat ran great during sea trial.
    Naw,..... I fail to see a problem,... Sounds like a nice healthy motor,....

    A good maintenance plan oughta keep it runnin' that way,....
    Any Grease is Better,... Than No grease at All....

Similar Threads

  1. compression test
    By ralva in forum Crusader Marine Engine Forum
    Replies: 12
    Last Post: 01-19-2012, 12:18 PM
  2. Low compression test
    By Alister Cara in forum Mercruiser Sterndrive Forum
    Replies: 5
    Last Post: 05-26-2011, 08:01 PM
  3. Mercruiser 2004 5.0 Compression Test Advice
    By chadg6 in forum Mercruiser Sterndrive Forum
    Replies: 6
    Last Post: 04-20-2010, 06:22 AM
  4. How do you do a compression test
    By jamiel in forum Johnson Evinrude Outboard Archive
    Replies: 1
    Last Post: 09-16-2008, 10:24 AM
  5. Compression test
    By grios721 in forum Mercury Mariner Outboard Archive
    Replies: 2
    Last Post: 09-14-2008, 12:44 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
  •