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Old 04 June 2009, 17:24   #11
Bigmuz7's Avatar
Country: UK - Scotland
Town: Glasgow
Boat name: stramash
Make: Tornado
Length: 5m +
Engine: Etec 90
Join Date: Feb 2006
Posts: 5,064
Originally Posted by Davie View Post
Your trim ram seal on the port side is broken which has let salt water under the seal. It it now so badly corroded in there that the end cap with the 4 indents in it has gripped the ram so tight that the pressure relief valve is opening (the same valve that opens when you hit a submerged object). Take a punch and remove the end cap (special tool is crap). Press out the trim ram and scrape out the corrosion. I would do the other at the same time. Make sure you quote the serial no as there are 2 types of seal. TOP TIP When assembling, push the trim rams right in then put as much oil (ATF ONLY) as you can then screw the end caps on. This will hopefully help with bleeding the system otherwise you will need to remove the engine off the transom to slacken the pump. Remove the fill plug 17mm hex to fill with ATF until it overflows. Tilt up and down once only and leave it for 10 mins then do again. DO NOT go up down, up down, up down. You will airiate (spellcheck) the oil and you will get nowhere.

Thats a lot of work for not a huge problem as it seems .. whats the down side of just leaving it ? and how soon would ignoring it be fatal in your view ?

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Old 05 June 2009, 03:37   #12
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
Mine takes for ever to trim down when its on the trailer, but when its on the water its ok, as long as your'e in forward gear the thrust of the prop helps it trim in quicker. trimming out is never a problem.
theres quite a complex arrangement of relief valves in the tilt unit and the way it works means there is more hydraulic pressure involved in trimming in then just tilting in or trimming out so it will be a bit slower anyway.
i got into the habit of trimming in while still under way saves what seems like an age waiting for it to trim in when stationary,
seal could do with changing, see if your fluid is pink rather than red.

I am usually not as green as i am cabbage looking.
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Old 05 June 2009, 04:46   #13
Country: UK - England
Town: Brum
Boat name: UTV
Make: zodiac FR
Length: 3m +
Engine: 2 stroke 15hp
MMSI: 999
Join Date: May 2003
Posts: 379
The cross sectional area of a cylinder's piston when retracting is less then when it is extending (the rod attached to the cylinder's piston reduces the CSA) Perhaps that's why they are slower going in.
Big waves, small boat ;)
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Old 05 June 2009, 04:48   #14
Country: UK - England
Town: Southport
Boat name: Qudos
Make: 5.4 Searider
Length: 5m +
Engine: Yam 115 V4
MMSI: 235068784
Join Date: Sep 2008
Posts: 3,930
Thanks for all this lads. I'm going to check this out this weekend. I treated the corrosion on the that you can see earlier his year. That photo was taken just after the winch strap snapped my finger.

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