- Joined
- Nov 20, 2021
- Messages
- 2,210
Haven't been as active on the forum lately. Not much automotive work in the last month, and I've been working five days a week instead of three to make more money and spend more time learning. Still making lots of aluminum suspension and steering link bars, other odds and ends. I've spent the last few days modifying hydro boost brake boosters. We get reman Cardones, disassemble them, turn the center section of the spool valve down from .580-.585" to .476-.478", drill out the supply and return openings with a Milwaukee 18 v drill, clean everything up and reassemble. We also do a leak/flow bench test but I haven't learned how to do that yet. These mods are supposed to increase volume and flow through the unit for better braking pressure.
Yesterday I repaired a customer return unit that was leaking out the back of the unit around the input shaft. I was looking for pinched or torn o-rings. Grabbed another input shaft from a different unit and noticed the fitment in the housing was tighter. Measured the outer diameter of the sealing surface of the shafts and the one from the offending unit was .045" smaller than the good one. A difference of .540" and .595". I installed a .594" spare into the returned unit, reassembled, and it's waiting to be leak/flow tested.
Yesterday I repaired a customer return unit that was leaking out the back of the unit around the input shaft. I was looking for pinched or torn o-rings. Grabbed another input shaft from a different unit and noticed the fitment in the housing was tighter. Measured the outer diameter of the sealing surface of the shafts and the one from the offending unit was .045" smaller than the good one. A difference of .540" and .595". I installed a .594" spare into the returned unit, reassembled, and it's waiting to be leak/flow tested.