Originally Posted by Andy Cox
..........a spurt of oil is coming out of the breather hole in the filler plug as soon as I start to come back the other way. In addition to this, ................ and I try to turn, there is a lot of resistance at the wheel which suddenly gives and out comes another spurt of oil.
Sounds familiar, and I am sure it's air.
I had no end of problems bleeding my steering after fitting a new pump, pipes and ram, I think mainly due to the fact that there is little difference in height between the helm pump and the ram. I suspect that most boats fitted with this type of helm pump (original P22 is a Wagner type G) have more vertical distance.
I think that another problem was air leaks and I resolved this by thread sealing every joint. I also made a temporary ‘header tank’ using a piece of pipe and plastic bottle with the bottom cut off and by leaving it for a period and then turning it lock to lock I finally got all the air out. You can watch air bubbles raising up the pipe.
Even with a new helm pump there is tendency for it to ‘spit’ at full lock and for that reason I do not have a vent in my filler plug equally because the helm is out in the weather (as opposed to in a wheelhouse) I wanted to keep water out.