1983 Merc 115 Inline Trim Bleeding Issues

[kswiatk]

I have a 1983 Merc 115 inline SN # 6411738 with dual cylinders and onboard pump.

I purchased the boat last year and the hydraulic lines were torn so I replaced them, then followed the procedure to bleed them. This was after running multiple cycles with the vent screw off and adding fluid as needed.

However, the cylinders still seem to have air in this as I can pull the motor up and down about an inch or two and I can see the rods move in and out of the cylinder with this process.

Is there anyway to bleed the cylinders or I am not doing the process correctly? I don't seem to have bleeder screws, but I have attached pictures of my cylinders.

Thanks

 

[Chris1956]

My '77 Merc had the same system, although, the top of the PTT cylinder did have a Phillips head bleed screw. That was for "down" bleeding.

Look on the PTT cylinder where the hydraulic hoses attach. I had an "up" bleed screw there. You needed to remove the PTT cylinder from the mount, and face the bleed screw up and run the PTT pump to bleed it. Both cylinders needed to be bled.

The PTT pump was self bleeding.

 

[merc850]

Just follow these instructions

 

[kswiatk]

I will have to check to be sure, but I am fairly certain there are no slotted screws at all on the cylinder. The pictures show there isn't one on top, and I didnt see one in the rear by the hoses.

Am i able to use the allen screws instead? Do I have an bleeding options?

 

[merc850]

The Allen screws replaced the slot head ones they do the same thing.