Welcome Guest - Sign Up today
Welcome Guest - Sign Up today
Store Links Mobile - Shop Now



Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old topics or hijack existing topics. Old topics of a technical nature are like a library book, Please do not write in them.

2. Old topics should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elseís topic (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new topic of your own.

4. If you have a question for the original poster (OP) and the topic is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old topic.

5. By starting your own topic, you will receive the maximum number of views by forum helpers that may not even notice your question when itís posted at the end of someone elseís topic. And those answers will be specific to your particular issue.

6. Please do not post to topics that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any topic that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old topic.

7. Posting at the end of any topic is considered to be hijacking the original posters topic which in turn subjects the topic to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive topic asking you not to reply to old topics. The Red banner will read: Please note this topic has been inactive for 90 days. For the best results, please start a new topic.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
See more
See less

1988 Mercury 100hp outboard trim motor removal.

  • Filter
  • Time
  • Show
Clear All
new posts

  • 1988 Mercury 100hp outboard trim motor removal.

    I have a 1988 Mercury 100 hp outboard that the trim motor will not work. When you hit the up or down switch the solenoids click but no movement in the motor. Tried bypassing solenoids per other post on board and this did not work. Battery has a full charge. So I would like to remove the unit and try and clean it. I can see the front bolt but there appears to be a back bolt. How do I get to the back bolts? Do I have to remove the transom bolts? Last question, what weight and type oil do I top off the fluid with? It is a square type motor with 3 wires and two solenoids and three trim pistons. Thanks for your help. BC.

  • #2
    Sign up today
    Re: 1988 Mercury 100hp outboard trim motor removal.

    that unit sounds the same as mine, heres what i did to remove mine. raise the motor and put the travel arm down. take the 3 bolts out of the trim unit that go through the right motor bracket. lossen the steering cable that goes through the right mount so it will slide a couple of inchs. remove the transom bolts on the right bracket. it should now slide to the right enough to get to the back bolt. make sure the area is as clean as you can get it before you pull the motor out of the pump. it looks like the motor would move but it should stay put. a 4 mm 6 point socket fits the shaft coming out of the trim motor, mine just needed freeing up. hth