User Tag List
Results 31 to 35 of 35
Thread: Tilt Trim - STP oil additive?
-
04-11-2019, 07:17 AM #315000 RPM
- Join Date
- Aug 2006
- Location
- Clinton, Illinois
- Posts
- 238
- Thanks (Given)
- 12
- Thanks (Received)
- 10
- Likes (Given)
- 8
- Likes (Received)
- 41
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
-
05-13-2019, 09:34 AM #325000 RPM
- Join Date
- Aug 2006
- Location
- Clinton, Illinois
- Posts
- 238
- Thanks (Given)
- 12
- Thanks (Received)
- 10
- Likes (Given)
- 8
- Likes (Received)
- 41
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
Update....
We ended up taking four different cylinders and building two good ones. I used a machine shop in Central Illinois that specializes in hydraulics. I'm handy, and could have rebuilt these myself...but frankly have had a bad record in the last number of years getting seals in without damage. So, I defer to the experts. Interesting, the experts tore one of the seals and had to get new ones for the two cylinders they rebuilt. It made me feel better about them doing it - as if they goofed them, I surely would have!
Got them on - drained out the STP - and filled up with 10/30 oil per the instructions. They are self bleeding after running up and down and topping off.
They are working great!
Now - here is the part I'm kicking myself. Somewhere in this thread we talked about putting it in reverse and the engine jumping up out of the water when throttling. (this isn't why I moved forward to rebuild/add STP, etc, but figured it would be a bi-product of new internals to stop the lift up). Turns out, that was my fault! There is a "reverse" lock out knob on the pump. You have to turn it full left to lock. I don't know how I missed that before. So, anybody reading this with a motor jumping up in reverse...check your lock out position!
Now, next thing we learned. While they will interchange, Mercury used different cylinders for different HP ratings. I had the 50 hp models on there all along which was the confusion on why the rebuild kit didn't work. The over 50 hp ones move the same distance and fit in the same spot but use a totally different internal setup. My machine shop can't say based on looking at both why one would be better than the other. I feel better about having the correct ones though.
-
SS Minnow liked this post
-
06-03-2019, 08:40 AM #335000 RPM
- Join Date
- Aug 2006
- Location
- Clinton, Illinois
- Posts
- 238
- Thanks (Given)
- 12
- Thanks (Received)
- 10
- Likes (Given)
- 8
- Likes (Received)
- 41
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
Took the boat out this weekend. Now that the air is all out - and I was able to really run it...WOW! The old ones were leaking down all along and i was having a terrible time trimming it out at speed. Now...I can wide open...and trim till is slides out on top and go like a rocket again!!!!!!! And...NO LEAKS!!!!!!!!!!!!!!
-
06-03-2019, 11:48 AM #346000 RPM
- Join Date
- Feb 2011
- Location
- HUDSON, FLORIDA
- Posts
- 1,528
- Thanks (Given)
- 433
- Thanks (Received)
- 64
- Likes (Given)
- 435
- Likes (Received)
- 452
- Mentioned
- 1 Post(s)
- Tagged
- 0 Thread(s)
-
06-03-2019, 11:55 AM #355000 RPM
- Join Date
- Aug 2006
- Location
- Clinton, Illinois
- Posts
- 238
- Thanks (Given)
- 12
- Thanks (Received)
- 10
- Likes (Given)
- 8
- Likes (Received)
- 41
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
I used a local machine shop that specializes in hydraulics and welding. He tore one of the seals during install, pulled it all back out and replaced with a "better" seal according to him. They also made up a rig to pressurize them and put them through the paces before calling me to pick them up. Let's hope it keeps working!
Similar Threads
-
Tilt N Trim won't Tilt N Trim on 2006 Tohatsu MD 50 B
By ZO6 in forum Technical DiscussionReplies: 12Last Post: 12-31-2018, 09:29 PM -
Aftermarket trim: Panther power trim and tilt bracket opinions?
By mxz in forum General Boating DiscussionReplies: 4Last Post: 10-28-2016, 06:05 AM -
V6 OMC tilt n trim won't hold after down trim but will hold afer up trim, what seal?
By at100plus in forum Technical DiscussionReplies: 9Last Post: 07-02-2014, 02:42 PM -
OMC Tech: 2-piston trim system won't TILT up, but WILL trim up
By pcrussell50 in forum Technical DiscussionReplies: 2Last Post: 08-20-2010, 03:41 PM