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  1. #1
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    Question Merc Manual 2001 300x Compression ?????

    Anyone with a 300x manual that covers 2001, S/N OT235158, what's the manual call out on compression ??????? I bought a new Merc manual and I've already found lots of errors besides the one page revision sheet they put in for all the corrections and I think this is just another one, they list compression @ 110-115 .

    Thx,
    https://youtu.be/IGkyssK27rU

    **Bullet Proof Foot Control >>>>>$295 + Trip
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    Gary
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    Growing old is inevitable, growing up is optional.......

  2. #2
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    300 ProMax/Super Magnum shop manual (pre X models) specs compression @ 120-130 psi.
    Compression to be checked w/ throttle plates @ WOT.
    Doesn't spec hot or cold.

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    having the same
    Attached Thumbnails Attached Thumbnails EN_04.pdf  

  4. #4
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    the x motor compression will be different then the promax/super mag. what numbers are you coming up w/ gary?
    action mobile marine, 772 528 0754, dealers for aces fuel products,wolf efi, pro marine,latham and gaffrig/livorsi. we build gearcases and modify them(3 litre) to ratchet, and powerheads as well. 21 skater/3 litre wolf efi 113 mph the engine build http://www.screamandfly.com/showthre...-3-litre-build

  5. #5
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    Quote Originally Posted by mrcrsr View Post
    the x motor compression will be different then the promax/super mag. what numbers are you coming up w/ gary?
    Charlie,
    I haven't done a compression check yet, although I will this weekend. Reason for asking is as I was reading the manual the other night, it quoted compression for the Merc 300x at 110-115 psi for my year & S/N motor, I just thought that to be way to low. That's basically 225/250 compression. I was expecting to see 125-130 compression for the 2001 300x, I'm I way off here ?????????
    https://youtu.be/IGkyssK27rU

    **Bullet Proof Foot Control >>>>>$295 + Trip
    **Smooth and fastest throttle response
    **2 LB's Lighter that any cast Hot Foot types
    **All "BILLET" construction, compare, you'll see this is the "BEST IN CLASS FOOT CONTROL"......contact me.


    Gary
    Life Time Member Of The
    Haul'n Ass, Burn'n Gas &
    Honorary Blown Motor Club


    Growing old is inevitable, growing up is optional.......

  6. #6
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    Charlie,

    UPDATE:

    I got home early today and ran the compression test. Manual says 110-115 psi on my 300x and I'll have to say the manual is totally wrong. On a cold motor I ran all 6 ranging from 145-149 psi. So much for a $90 manual to guide you through your motor.........
    https://youtu.be/IGkyssK27rU

    **Bullet Proof Foot Control >>>>>$295 + Trip
    **Smooth and fastest throttle response
    **2 LB's Lighter that any cast Hot Foot types
    **All "BILLET" construction, compare, you'll see this is the "BEST IN CLASS FOOT CONTROL"......contact me.


    Gary
    Life Time Member Of The
    Haul'n Ass, Burn'n Gas &
    Honorary Blown Motor Club


    Growing old is inevitable, growing up is optional.......

  7. #7
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    that sounds better gary, i expected to see anywhere from 135 to 145(but wasn't sure), the key thing is no more then 10% variance(and i like to see less then that)
    action mobile marine, 772 528 0754, dealers for aces fuel products,wolf efi, pro marine,latham and gaffrig/livorsi. we build gearcases and modify them(3 litre) to ratchet, and powerheads as well. 21 skater/3 litre wolf efi 113 mph the engine build http://www.screamandfly.com/showthre...-3-litre-build

  8. #8
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    Charlie,
    The readings are probably a tad high because I did put some oil in each cylinder prior to testing, but never the less there all checking close to each other. I did ask Merc in an email why the manual stated 110-115 psi and there reply was quote:

    Re: 2001 Mercury Pro Max 300X


    Thank you for your e-mail regarding your 2001 Mercury Pro Max 300X motor, serial # 0T235158. We appreciate the opportunity to respond to your concerns.

    The specifications in the book are correct for a new motor. As the motor breaks in (about 30 hrs run time), and the rings start to set, you can expect to see around 130+ psi for compression.

    We hope this information is helpful to you. Should you have any further questions or concerns, please contact our Customer Service department at 920-929-5040 between the hours of 7:30 a.m. and 4:30 p.m., Monday through Friday, CST.

    Sincerely,

    Mercury Outboard Customer Assistance



    In my opinion, I personally think it's wrong to list the compression as brand new, not broken in, or at least make note of average psi after break in is completed, after all it's a service manual to assist in the maintenance of a motor that been run..........
    https://youtu.be/IGkyssK27rU

    **Bullet Proof Foot Control >>>>>$295 + Trip
    **Smooth and fastest throttle response
    **2 LB's Lighter that any cast Hot Foot types
    **All "BILLET" construction, compare, you'll see this is the "BEST IN CLASS FOOT CONTROL"......contact me.


    Gary
    Life Time Member Of The
    Haul'n Ass, Burn'n Gas &
    Honorary Blown Motor Club


    Growing old is inevitable, growing up is optional.......

  9. #9
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    gotta love mercury, i've seen a couple of mistakes in their manuals
    action mobile marine, 772 528 0754, dealers for aces fuel products,wolf efi, pro marine,latham and gaffrig/livorsi. we build gearcases and modify them(3 litre) to ratchet, and powerheads as well. 21 skater/3 litre wolf efi 113 mph the engine build http://www.screamandfly.com/showthre...-3-litre-build

  10. #10
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    Quote Originally Posted by mrcrsr View Post
    gotta love mercury, i've seen a couple of mistakes in their manuals
    In this manual, they've got an entire page dedicated to revisions to correct mistakes...............LOL.

    https://youtu.be/IGkyssK27rU

    **Bullet Proof Foot Control >>>>>$295 + Trip
    **Smooth and fastest throttle response
    **2 LB's Lighter that any cast Hot Foot types
    **All "BILLET" construction, compare, you'll see this is the "BEST IN CLASS FOOT CONTROL"......contact me.


    Gary
    Life Time Member Of The
    Haul'n Ass, Burn'n Gas &
    Honorary Blown Motor Club


    Growing old is inevitable, growing up is optional.......

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