User Tag List

Thanks Thanks:  0
Likes Likes:  0
Results 1 to 5 of 5
  1. #1
    Join Date
    Jul 2011
    Location
    Stetsonville, WI
    Posts
    25
    Thanks (Given)
    0
    Thanks (Received)
    0
    Likes (Given)
    0
    Likes (Received)
    0
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    1999 Mercury 225 ProMax

    I am buying a 99 Procraft with a 99 225 Optimax on it tomorrow. The motor only has 58 hours on it since new. No work has been done to it.

    My question is this. I have read alot on how these motors blow up around 130 hours. I assume this motor is still in break in mode as well. Is there something i can do to prevent this from happening? Replace injectors, reprogram ECM's etc?

    Thanks guys!
    Last edited by FisherBoats; 02-24-2012 at 09:14 AM.

  2. #2
    Join Date
    Apr 2001
    Location
    Brookeland , Texas 75931 North of Jasper
    Posts
    11,838
    Thanks (Given)
    4
    Thanks (Received)
    163
    Likes (Given)
    11
    Likes (Received)
    795
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Is it an Opti OR a Pro max , you posted about both..

    Jay
    Jay @ JSRE


  3. #3
    Join Date
    Jul 2011
    Location
    Stetsonville, WI
    Posts
    25
    Thanks (Given)
    0
    Thanks (Received)
    0
    Likes (Given)
    0
    Likes (Received)
    0
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Sorry its an OptiMax 225 Can a mod please correct the title?

  4. #4
    Join Date
    Dec 2007
    Location
    wisconsin
    Posts
    325
    Thanks (Given)
    0
    Thanks (Received)
    0
    Likes (Given)
    0
    Likes (Received)
    0
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    its not in break in mode any more, I think break in only last the first 10hrs. It seems when they blow up they usuially eat #6 cyliner. I was told its usuially caused by super long idle times then sombody just pins it from idle to wide open. And since #6 is the lowest cylinder all the moisture collects in that cylinder and sort of hydrolocks it. AND cold water enters right below # 6 and warps the sleve causeing the piston to stick.
    This is just what im told so dont think thats the only reason they blow up.
    My 250 ate #6 at 480 hrs, I rebuilt it and have not had any problems since.

  5. #5
    Join Date
    Jul 2011
    Location
    Stetsonville, WI
    Posts
    25
    Thanks (Given)
    0
    Thanks (Received)
    0
    Likes (Given)
    0
    Likes (Received)
    0
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I was only able to test the middle right side cylinder (brainfart on the cyl #) and it tested 100#. However the engine was cold and I had all other plugs still in the motor. Can someone please tell me what the motor should be at for compression? One place I read 90-105# and a different place on here says 120-130 #. Can someone please verify the true spec please?

    Thanks!

    Fish

Posting Permissions

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