Little Dog
A2OC Donor
The vacuum side of the pump is a large oil lubricated vane pump. Air in and air out in yellow, out at the lowest point allowing oil to drain:
Interestingly the oil supply appears to bypass the pump (purple arrow). I need to work out where that goes to.
There is what looks like a reed valve on the return of air and oil to the cylinder head. Need to check it out.
There may also be a valve in the vac connection.
Also I've found the reason this pump leaked. Diesel has destroyed the O ring where diesel under pressure passes from the outer to inner casing (red arrow). That seal cost me for a set of hoses and a Bosch pump.
Interestingly the oil supply appears to bypass the pump (purple arrow). I need to work out where that goes to.
There is what looks like a reed valve on the return of air and oil to the cylinder head. Need to check it out.
There may also be a valve in the vac connection.
Also I've found the reason this pump leaked. Diesel has destroyed the O ring where diesel under pressure passes from the outer to inner casing (red arrow). That seal cost me for a set of hoses and a Bosch pump.