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  1. #1

    Default Help With 35HP Mercury Outboard, Power trim

    Hello, I am new to this forum, as I just got a outboard mercury. I am also just starting to work on motors, I am a college student and have fixed up a couple motors off various things before. I bought the motor used with a couple issues with it and was looking for some help, mainly with the power trim.
    Motor info: 35 HP Outboard Mercury, I believe 1985 is the year, but if someone knows better please correct me. Serial Number is A185738, and I am unsure of the model number. I will upload a few pictures to this post as well.

    When I bought the motor, the seller claimed that the power trim lift system was working, and when I set it up on the stand to test it when I first started working on the motor the power trim raised the motor a few inches, and then lowered it back to the original height, however it would not lower the motor all the way down (its about half way up). After this the power trim has not moved the motor at all. I have checked the hydraulic fluid, topped it off and its currently mounted the right way up. The hydraulic pump will run (makes a noise like its running when connected to a battery) but it does not lift or lower the motor, as if it is not engaging. I have looked around and found some diagrams for it but nothing super useful online. I was wondering if there is a good way to trouble shoot this or bleed the system or should I clean the lines, but then again how would I get air out of the system. Again, it was supposedly working before I bought it, but it did sit in their barn for a few months, so I expected issues with it.

    Also if anyone can correct the year or confirm it being a 1985 that would be great.

    Any and all help will be greatly appreciated, diagrams, troubleshooting, common issues, possible solutions would all be great! As I said I am new to this and have only worked on a couple motors before so all help is useful.
    If there is any other information I can give about the motor that would be useful, please let me know as well and I will see what I can do!
    Click image for larger version. 

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  2. #2
    Join Date
    May 2007
    Location
    Ireland,the only country in the world you can go North to go South
    Posts
    2,270

    Default Re: Help With 35HP Mercury Outboard, Power trim

    Firstly check the fluid level.Should be to the threads of the fill screw. The hex bolt in pic second from the bottom. Next make sure knurled knob in same pic is full left.Actually do that first. And number makes it '85

  3. #3

    Default Re: Help With 35HP Mercury Outboard, Power trim

    Here are some pages for bleeding the 2 ram systemClick image for larger version. 

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    Click image for larger version. 

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    Last edited by Quicksilver; 12-22-2020 at 04:29 PM.

  4. #4

    Default Re: Help With 35HP Mercury Outboard, Power trim

    Thank you all for your help, I will see what I can do with this info!

  5. #5

    Default Re: Help With 35HP Mercury Outboard, Power trim

    In the picture it shows a slotted bleed screw, some units used a 3/16" Allen screw.

  6. #6

    Default Re: Help With 35HP Mercury Outboard, Power trim

    Hi All,

    Thank you for your help, I was able to get the power trim working! However, as soon as I mounted it to the boat the rod that goes through the motor mount to the power trim cylinder mounts broke, but it seems to be rusted in. I have tried a few things, but it looks like I will have to cut and drill it out and fabricate a new one but I wanted to see if there were any suggestions first! I have picture I can email or send, but I can't figure out how to upload additional photos beyond the ones I had for my previous post.

    Thanks!

  7. #7

    Default Re: Help With 35HP Mercury Outboard, Power trim

    Quote Originally Posted by Quicksilver View Post
    Here are some pages for bleeding the 2 ram systemClick image for larger version. 

Name:	POWERTRIM&TILT-page-1.jpg 
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ID:	25744
    Click image for larger version. 

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    Click image for larger version. 

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    Hi, sorry for picking up the thread, but I need this book, do you have it, do you know where I could find it?

  8. #8

    Default Re: Help With 35HP Mercury Outboard, Power trim

    Yes I have it I bought from Mercury but it only covers 1975-1978 models, you'll need a newer one if your motor is a 1985.

  9. #9

    Default Re: Help With 35HP Mercury Outboard, Power trim

    I seem to have something like that, if you need you can contact me.

  10. #10

    Default Re: Help With 35HP Mercury Outboard, Power trim


  11. #11

    Default Re: Help With 35HP Mercury Outboard, Power trim

    also see:

    Mercury Outboards 1-2 Cylinder, 2-40 HP, 1965-1989 Repair & Service Manual


    As for the year, Mercury didn't really use a "model year" system, but from the data we have A185738 does look like it's 1985.

    You can add photos to any post. You should see icons above the text field. Over to the right is an image icon to "insert images". Thanks!

  12. #12

    Default Re: Help With 35HP Mercury Outboard, Power trim

    Thank you!

  13. #13

    Default Re: Help With 35HP Mercury Outboard, Power trim

    Quote Originally Posted by admin View Post
    also see:

    Mercury Outboards 1-2 Cylinder, 2-40 HP, 1965-1989 Repair & Service Manual


    As for the year, Mercury didn't really use a "model year" system, but from the data we have A185738 does look like it's 1985.

    You can add photos to any post. You should see icons above the text field. Over to the right is an image icon to "insert images". Thanks!
    But how can I find out if it refers to model year or is it a vin code?

  14. #14

    Default Re: Help With 35HP Mercury Outboard, Power trim

    You use the serial Nr. to order parts etc. Any dealer or online parts store will use that Nr.
    Last edited by Quicksilver; 09-29-2022 at 01:42 PM.

  15. #15
    Join Date
    Aug 2022
    Location
    Bailey, CO
    Posts
    6

    Default Re: Help With 35HP Mercury Outboard, Power trim

    Hi, I'm also an engineer student and some help would be welcome. I need a link to some reliable books or just papers about motor fixing. It's my graduation year, so it is important for me.

  16. #16

    Default Re: Help With 35HP Mercury Outboard, Power trim

    Quote Originally Posted by Cooper= View Post
    Hello, I am new to this forum, as I just got a outboard mercury. I am also just starting to work on motors, I am a college student and have fixed up a couple motors off various things before. I bought the motor used with a couple issues with it and was looking for some help, mainly with the power trim.
    Motor info: 35 HP Outboard Mercury, I believe 1985 is the year, but if someone knows better please correct me. Serial Number is A185738, and I am unsure of the model number. I will upload a few pictures to this post as well.

    When I bought the motor, the seller claimed that the power trim lift system was working, and when I set it up on the stand to test it when I first started working on the motor the power trim raised the motor a few inches, and then lowered it back to the original height, however it would not lower the motor all the way down (its about half way up). After this the power trim has not moved the motor at all. I have checked the hydraulic fluid, topped it off and its currently mounted the right way up. The hydraulic pump will run (makes a noise like its running when connected to a battery) but it does not lift or lower the motor, as if it is not engaging. I use Paperell to get term papers for sale and learn about engineering theories and others. I was wondering if there is a good way to trouble shoot this or bleed the system or should I clean the lines, but then again how would I get air out of the system. Again, it was supposedly working before I bought it, but it did sit in their barn for a few months, so I expected issues with it.

    Also if anyone can correct the year or confirm it being a 1985 that would be great.

    Any and all help will be greatly appreciated, diagrams, troubleshooting, common issues, possible solutions would all be great! As I said I am new to this and have only worked on a couple motors before so all help is useful.
    If there is any other information I can give about the motor that would be useful, please let me know as well and I will see what I can do!
    Click image for larger version. 

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    Hey Cooper, have you found all the answers you needed? Try helping Christine since I would also ask you if I can DM you about some common things I observed in your photos with my car. Thanks in advance, and waiting for feedback.

  17. #17

    Default Re: Help With 35HP Mercury Outboard, Power trim

    Quote Originally Posted by Cooper= View Post
    Hello, I am new to this forum, as I just got a outboard mercury. I am also just starting to work on motors, I am a college student and have fixed up a couple motors off various things before. I bought the motor used with a couple issues with it and was looking for some help, mainly with the power trim.
    Motor info: 35 HP Outboard Mercury, I believe 1985 is the year, but if someone knows better please correct me. Serial Number is A185738, and I am unsure of the model number. I will upload a few pictures to this post as well.

    When I bought the motor, the seller claimed that the power trim lift system was working, and when I set it up on the stand to test it when I first started working on the motor the power trim raised the motor a few inches, and then lowered it back to the original height, however it would not lower the motor all the way down (its about half way up). After this the power trim has not moved the motor at all. I have checked the hydraulic fluid, topped it off and its currently mounted the right way up. The hydraulic pump will run (makes a noise like its running when connected to a battery) but it does not lift or lower the motor, as if it is not engaging. I have looked around and found some diagrams for it but nothing super useful online. Besides that as I said before, I'm a college student and I don't know how to time manage to manage this engine, I'm trying to read here about how I could organize my time to manage to do more stuff. I hope it works for me, but some advice would be welcome. Thanks in advance. Again, it was supposedly working before I bought it, but it did sit in their barn for a few months, so I expected issues with it.

    Also if anyone can correct the year or confirm it being a 1985 that would be great.

    Any and all help will be greatly appreciated, diagrams, troubleshooting, common issues, possible solutions would all be great! As I said I am new to this and have only worked on a couple motors before so all help is useful.
    If there is any other information I can give about the motor that would be useful, please let me know as well and I will see what I can do!
    Click image for larger version. 

Name:	IMG_20201123_173946 (1).jpg 
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ID:	25738Click image for larger version. 

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    But still I have the impression that it is one of the most unsuccessful engines(
    because I have now purchased one and have already been to the repair shop several times.

  18. #18

    Default Re: Help With 35HP Mercury Outboard, Power trim

    They started making them in 1965 so I'd say they were successful, maybe your repair shop isn't competent or interested in the motor.

  19. #19
    Join Date
    Oct 2022
    Location
    Chicago, IL 60606
    Posts
    3

    Default Re: Help With 35HP Mercury Outboard, Power trim

    Quote Originally Posted by Cooper= View Post
    Hello, I am new to this forum, as I just got a outboard mercury. I am also just starting to work on motors, I am a college student and have fixed up a couple motors off various things before. I bought the motor used with a couple issues with it and was looking for some help, mainly with the power trim.
    Motor info: 35 HP Outboard Mercury, I believe 1985 is the year, but if someone knows better please correct me. Serial Number is A185738, and I am unsure of the model number. I will upload a few pictures to this post as well.

    When I bought the motor, the seller claimed that the power trim lift system was working, and when I set it up on the stand to test it when I first started working on the motor the power trim raised the motor a few inches, and then lowered it back to the original height, however it would not lower the motor all the way down (its about half way up). After this the power trim has not moved the motor at all. I have checked the hydraulic fluid, topped it off and its currently mounted the right way up. The hydraulic pump will run. I used https://edubirdie.com/buy-dissertation to graduate because my decision to buy dissertation also brought knowledge. I have looked around and found some diagrams for it but nothing super useful online. I was wondering if there is a good way to trouble shoot this or bleed the system or should I clean the lines, but then again how would I get air out of the system. Again, it was supposedly working before I bought it, but it did sit in their barn for a few months, so I expected issues with it.

    Also if anyone can correct the year or confirm it being a 1985 that would be great.

    Any and all help will be greatly appreciated, diagrams, troubleshooting, common issues, possible solutions would all be great! As I said I am new to this and have only worked on a couple motors before so all help is useful.
    If there is any other information I can give about the motor that would be useful, please let me know as well and I will see what I can do!
    Click image for larger version. 

Name:	IMG_20201123_173946 (1).jpg 
Views:	64 
Size:	331.6 KB 
ID:	25738Click image for larger version. 

Name:	IMG_20201125_155547 (1).jpg 
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Size:	422.5 KB 
ID:	25739Click image for larger version. 

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    This engine has served me for over 10 years, I was still doing my school studies. I trust its reliability and durability more than any other engine.
    Hey Ralphgoff, haven't you heard that this engine's low maintenance and ease of repair is as legendary as its performance?

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