Yamaha trim problems

ian mcconnell · 29 March 2007, 12:24

I have a Yam 90hp 2 stroke, noticed last 2 outings that it is not holding its trim position, thought initially i had just knocked the trim button, So i left it in its fully up position while i enjoyed food & pint only to find it had trimed back into the water.

No oilly leaks from trim system, im guessing theres a simple test, change fluid, purge system?????

what should i do or look out for???

Jizm · 29 March 2007, 16:05

if there are no leaks then check the oil level.

Jizm · 29 March 2007, 16:30

could also be the tilt cylinder leaking by internally...

ian mcconnell · 29 March 2007, 16:39

Is the oil level easy to check, i have been told the system is sealed if i open this up i will need to purge any air out. How do i do that??

Jizm · 29 March 2007, 16:44

the bleed screw will also let engine drop. sometimes referred to as the override. you fill the reservoir with the engine up on the tilt locking lever until oil starts to come out of the filler hole.

TimMcC · 29 March 2007, 16:54

Quote:

Originally Posted by ian mcconnell

I have a Yam 90hp 2 stroke, noticed last 2 outings that it is not holding its trim position, thought initially i had just knocked the trim button, So i left it in its fully up position while i enjoyed food & pint only to find it had trimed back into the water.

No oilly leaks from trim system, im guessing theres a simple test, change fluid, purge system?????

what should i do or look out for???

I had an intermittent trim/tilt switch . Used to trim the outboard up and down
when under way . Might be worth checking this as well .

Tim

jyasaki · 29 March 2007, 17:40

Quote:

Originally Posted by ian mcconnell

Is the oil level easy to check, i have been told the system is sealed if i open this up i will need to purge any air out. How do i do that??

Don't know about your motor, but a 2005 F115 is purged by running from full-up to full-down and back a few times.

jky

ian mcconnell · 29 March 2007, 17:52

All good, i will refill and purge as prompted. Thanks for all your help guys

Stoo · 29 March 2007, 19:20

My Yammie 150 does the same thing. A couple of service guys have told me that the seals on the piston start to leak after a few years. As I understand it, there is no way to repair these other than to replace the entire unit. I just live with it!

Milo72 · 29 March 2007, 19:38

I have a 4st 225 and I'm pretty sure it's dropping too....

Can anyone else see a pattern forming here...????

Nos4r2 · 29 March 2007, 19:51

I can- mine drops overnight. I live with it if it's on the trailer, if it's in the water overnight I put the tilt lock on.

Stoo · 30 March 2007, 12:37

Quote:

Originally Posted by Milo72

I have a 4st 225 and I'm pretty sure it's dropping too....

Can anyone else see a pattern forming here...????

Perhaps a Viagara tab in the oil would help?

ian mcconnell · 30 March 2007, 13:34

I managed a look at a manual which points at the seals, they are only a few pounds but you need a speacial tool to remove the lids to the pistons!!

It also states it could just be air in the system, the process looks simple enoth to fill and purge.

If i have success i will post it with joy, with post how i did it!!