Ford 860 Hydraulic fluid leak

[cbrake]

Put it back together, and still dripping in the same place a drop of oil per second when engine is running. Cleaned things up a bit and will try to see behind pump with a mirror after things dry off ...

 

[cbrake]

Between the pump and manifold the o-rings are of square cross section. Use the correct ones, whatever it takes to get them.

Square-Profile O-Rings

Standard AS-568 size Rubber Square Rings can sometimes be used interchangeably in AS-568 standard size O-Ring gland designs. Square Rings can be used in static applications where high sealing load force is required or when the sealing area is too thin to accommodate anything else. In most static...

www.theoringstore.com

The rings I got from the dealer were round. So I might need to go to a different source if square ones are required. Will re-evaluate once I know better where fluid is coming from.

 

[cbrake]

Tried the baby powder dusting -- seems a little wet on the pump housing at the bolt where it is leaking. Don't see any signs of leaks externally higher up the pump itself.

I had a square cross section washer from some other kit, so I tried that:

However, when I put it back together, hydraulics would not work at all -- I suspect the square cross section o-ring was not making good enough contact for the pump to establish a suction. Put round o-ring back in, and hydraulics worked but was still dripping.

Looking at the photo above, it is possible the pump is leaking internally and oil is running down the bolt hole?

The other possiblity is the round o-rings are not making a good enough seal. However it seems they fit well and you can see two photos up the protrude a good bit above the housing, so seems they should be making good contact.

 

[shaun wallace]

That block has 2 more orings at the parting line. Takes 2-214 orings.