• If this is your first visit to the iboats.com Boating Forums, be sure to check out the FAQ. To post a question or comment, begin by signing up. To start viewing messages, select the forum that you want to visit from the selection below.
  • ALL iboats Forum Members and Guests:
    To show our appreciation for your participation in the Forums, we're offering an exclusive Forums-only discount good for an additional 5% off your iboats.com order for a limited time.
    To redeem, simply call our Customer Service Team at 800-914-1123 (Open M-F, 9am - 8pm Eastern Time) and mention the Forums 5% off discount. Offer excludes engines, trolling motors, and electronics.

Announcement

Announcement Module
Collapse

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 threads or hijack existing threads. Old threads of a technical nature are like a library book, Please do not write in them.

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

3. Do not take over someone elseís thread (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 thread of your own.

4. If you have a question for the original poster (OP) and the thread 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 thread.

5. By starting your own thread, 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 thread. And those answers will be specific to your particular issue.

6. Please do not post to threads that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any thread 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 thread.

7. Posting at the end of any thread is considered to be hijacking the original posters thread which in turn subjects the thread 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 thread asking you not to reply to old threads. The Red banner will read: Please note this thread has been inactive for 90 days. For the best results, please start a new thread.

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

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

Mercruiser 888 Tilt / Trim Issues

Page Title Module
Move Remove Collapse
X
Conversation Detail Module
Collapse
  • Filter
  • Time
  • Show
Clear All
new posts


  • Mercruiser 888 Tilt / Trim Issues

    Symptoms: In neutral, forward or reverse (engine off, on trailer, etc) I can grab the skeg and lift the outdrive up by hand with very little hydraulic resistance. I can then lower it back to the original position by letting it down (again, by hand).

    On the water, I can put it in reverse and it creeps up - it doesn't pop up. Of course, I didn't rev it up to see if it would pop up.

    In forward, it creeps towards full trimmed down position (slowly). I have to tap the trim up switch from time to time to keep the bow from digging in as I cruise.

    History: Previous owner had replaced all exterior trim hoses. I have not checked for water in tilt / trim fluid. I don't have gauges set up to perform tests of the hydraulics as denoted in the Mercruiser manual.

    My question to those experienced is this: Should I start by tearing down the cylinders? I suspect bad or rust covered check balls and springs in the cylinder piston assy. The cylinder ends have marks suggesting that they have been disassembled before.

    I'm okay with working on hydraulic systems, but I'm not familiar with the construction of tilt / trim cylinders.

    Guidance and help is appreciated.


  • #2
    Re: Mercruiser 888 Tilt / Trim Issues

    Do you have the service manual for the drive? It's available in the Adults only Sticky.

    I haven't done it, but I would bet the procedure is in the service manual.
    20' Suntracker Pontoon

    Comment



    • #3
      Re: Mercruiser 888 Tilt / Trim Issues

      Surfdancer, It sounds like who ever changed out the hoses didn't refill or bleed the system correctly. Refill the tank (unit down) with ATF and operate your trim several times to remove air. Look for ATF leaks while you operate them. Unless you struck something it's not likely you need to rebuild rams. The rams/cylinders are simple to rebuild once you get them apart. THAT'S the hard part. Don't put your rams into a vise... smashing the tubes will ruin them.

      Comment



      • #4
        Re: Mercruiser 888 Tilt / Trim Issues

        Originally posted by "G" View Post
        Surfdancer, It sounds like who ever changed out the hoses didn't refill or bleed the system correctly. Refill the tank (unit down) with ATF and operate your trim several times to remove air. Look for ATF leaks while you operate them. Unless you struck something it's not likely you need to rebuild rams. The rams/cylinders are simple to rebuild once you get them apart. THAT'S the hard part. Don't put your rams into a vise... smashing the tubes will ruin them.
        I'll give that a try...

        Thanks!

        Comment



        • #5
          Re: Mercruiser 888 Tilt / Trim Issues

          Originally posted by Surfdancer View Post
          I'll give that a try...

          Thanks!
          I have a 75 888 drive, I just replace the High pressure line from the pump to the diaphraghm and I can get it to trim all the way up but only down half way. I have filled it and checked it every time it was all the way up. Does the bleed process take a long time? Or do I have another issue?

          Comment



          • #6
            Re: Mercruiser 888 Tilt / Trim Issues

            Originally posted by lurch67 View Post
            I have a 75 888 drive, I just replace the High pressure line from the pump to the diaphraghm and I can get it to trim all the way up but only down half way. I have filled it and checked it every time it was all the way up. Does the bleed process take a long time? Or do I have another issue?
            I saw there is a Service manual out there can someone please repost that link??!!

            Comment



            • #7
              Re: Mercruiser 888 Tilt / Trim Issues

              Welcome to iboats lurch, you need to start a new thread of your own with your questions and not dig up 4 year old threads out of the archives.
              Don S.

              sigpic

              Please, no PM's (Private Messages) regarding boat/engine problems.
              That is what the forums are for.
              Only forum/moderator issues will be answered in PM's.

              Comment

              Working...
              X