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Author Topic:   1990 Mariner 40hp PT Question
Toad2001 posted 06-19-2001 11:03 AM ET (US)   Profile for Toad2001   Send Email to Toad2001  
The Power Trim on my 4 cyl 2 stroke has always been a bit slow. Lately its started to get slower and now has a jerky motion (making weird boises too).
I suspect it needs fluid.
Whats the process to repair?
Clark Roberts posted 06-19-2001 04:46 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Try topping off the hyd fluid. Trim all the way up(or manualy raise by turning the release valve screw CCW) and engage trailering bracket or block up with piece of wood. Remove the fill cap (located on hyd reservoir beside the elec motor) and , using a plastic "
squeeze bottle like a "visene" bottle, slowly fill to overflowing with Automatic Transmission Fluid (ATF). Run trim up and down a few times and repeat! That should do it.. hope so anyway. If trim/tilt won't hold position and slowly drops down then a dose(couple of ounces) of "automatic transmission fluid conditioner".. many brand names avail at auto store... to the fluid reservoir can sometimes solve problem by swelling the rubber "O" rings. I put this stuff in all my trim units when they need fluid... try it you'll like it... Clark..The Old Man and the Sea
Toad2001 posted 06-19-2001 09:51 PM ET (US)     Profile for Toad2001  Send Email to Toad2001     
Thanks Clarke, but uh oh...
I put unit in the fully raised position. Removed large filler cap and some fluid oozed out, approx 1-2 oz. It had a milky appearance. Red like Tranny fluid but almost like water has been introduced.
Anyway, the unit is full, and groans and grinds while trying to raise/lower.
Last year the previous owner replaced the pump (I cant find the receipt to verify exactly what was replaced).
Can the unit be drained and refilled?
Perhaps that would make a difference/buy me some time before replacing the pump/(or complete motor). (My wife supports me getting a new engine. I'd prefer to get another year out of this one.)
Clark Roberts posted 06-20-2001 06:26 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
It does appear that water has intruded the system. Try to find out where the water is getting in ! You can drain the fluid (I think there is a plug under unit...or drain from hyd release valve, not sure)and refill(use some auto trans condition when you do). I believe that the hyd sys is self bleeding (run the unit up and down a few times and entrapped air will accumulate in reservoir) so you will have to top off a couple of times to completely refill.. You should get someone locally for some hands on help ... I may be wrong about the drain plug// etc..etc... a service manual would help also. Good luck ... Clark.. The Old Man and the Sea
Toad2001 posted 06-20-2001 11:41 AM ET (US)     Profile for Toad2001  Send Email to Toad2001     
So I leave the filler cap off when raising/lowering to bleed the system? (then top up in fully raised position)
I did try this last night, and replenishing the fluid (old stuff forced out) seems to have made a difference (unit now functioning).
After looking at the fluid that came out, its viscosity/colour is better than thought. I now doubt there was water in it.
I will try come conditioner and hopefully that will get it to be 100% again.
Clark Roberts posted 06-20-2001 04:08 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Filler cap ON to bleed system.. level in reservoir will drop as air is forced into reservoir... remove cap, top off with ATF (with some conditioner) replace cap and repeat several times... until level in reservoir stays at top!!! CAP ON TO BLEED!!!

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