old mercruiser 120- only 1 threaded trim line on pump?

[CamaroMan]

I bought a box full of 120 parts for a resto project - bolted up the transom plates and wanted to test trim lines b4 dropping rebuilt motor in -

The trim pump only has one threaded flare fitting - how does/did this work? And what is the hydraulic connection up on the steering arm for? old mechanic trim limit perhaps? i have new gauges in and will use the limit from the switch out back - just not sure how a pump with one line would lift/drop the drive?

 

[achris]

That's not an old 120, it's a VERY old 120. The days of a tilt only system. That single line tilted the drive up, and gravity (sorry, 'bouyancy'. See FE model) tilted it down!

Chris......

 

[Alumarine]

That might not be a steering arm.
It could be the trim gauge sending unit.
Does it have 2 wires coming out of it?

 

[Scott06]

That's not an old 120, it's a VERY old 120. The days of a tilt only system. That single line tilted the drive up, and gravity (sorry, 'bouyancy'. See FE model) tilted it down!

Chris......

Yeah pre 1969 I think. My grandfathers 1966 penn yann had this set up with a single line, never worked right even when new. Neighbors 1969 has two lines tilt and trim ..much better system.

 

[kenny nunez]

I converted some to power trim by mounting a trim block above the gimbal housing With 2 holes through through transom using 6 stainless 27” braided lines, 2 from the pump and reverse lock valve into the trim block and the other 4 going to the rams. The lines are Mercruiser parts.
Most of the time this was done on the earlier style gimbal housings where the lines came out from inside the gimbal housing.
This was the way the local Mercruiser warehouse and service school suggested.