Marine: Boating, Sailing, PWC, GPS and Navigation - Mercuiser Outdrive Tilt Hydraulic line Question
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TechProf
05-03-07, 08:38 PM
My name is Ron. I have an older Mercruiser 140 Lower Unit. It has 4 lines going to the lower unit that upward and downward motion of the tilt. It has two main lines that feed back through into the boat and connect to the pump and/or to a 2nd pump which is tied into the steering cables or so it appears.
The main pump with the fluid says use SAE 30 weight only. Last year the lower part of the pump sprang a leak and I lost all hydraulic pressure. It turned out that when I removed the pump the o-rings inside the plate on the bottom were shot. I replaced them and finally got the seal issue resolved.
However, I was given avice to by-pass the upper motor which had a return line going down to the lower side of the pump and was told I could plug that off. In doing so, I found that the pump will make a nice whine and sound like it is pumping, but it will not lift the outdrive. Now here is the problem: I can replace the plastic tube that goes from the top pump to the front of the lower main pump but that leaves me with an open in port of the top pump.
? I don't remember if one of the two main in lines go to the top pump or to the back of the lower main pump? Worse yet, if I remove either of the two main lines from the lower main pump that will leave me with an open hole in bottom of the main pump. So does anyone out there have an old Mercury Tri-hull who can look at your two main lines and tell me if they both go to the lower main pump or if one of them goes to the top in on the smaller pump near the steering cables? If so, does the other main line go to the in hole in the front or rear of the main pump? Which would mean I would have to plug one of those holes off if I did remove one of the ins to the main pump.
Your thoughts are appreciated.
The main pump with the fluid says use SAE 30 weight only. Last year the lower part of the pump sprang a leak and I lost all hydraulic pressure. It turned out that when I removed the pump the o-rings inside the plate on the bottom were shot. I replaced them and finally got the seal issue resolved.
However, I was given avice to by-pass the upper motor which had a return line going down to the lower side of the pump and was told I could plug that off. In doing so, I found that the pump will make a nice whine and sound like it is pumping, but it will not lift the outdrive. Now here is the problem: I can replace the plastic tube that goes from the top pump to the front of the lower main pump but that leaves me with an open in port of the top pump.
? I don't remember if one of the two main in lines go to the top pump or to the back of the lower main pump? Worse yet, if I remove either of the two main lines from the lower main pump that will leave me with an open hole in bottom of the main pump. So does anyone out there have an old Mercury Tri-hull who can look at your two main lines and tell me if they both go to the lower main pump or if one of them goes to the top in on the smaller pump near the steering cables? If so, does the other main line go to the in hole in the front or rear of the main pump? Which would mean I would have to plug one of those holes off if I did remove one of the ins to the main pump.
Your thoughts are appreciated.