I have an early TR4 A type laycock overdrive that suffered a pump roller lockup. Roller appeared to bind and flat spotted in several places before completely seizing. I have broken the trans completley down and cleaned and inspected everything. I have found only the pump plunger roller damaged and the cam is discolored from heat but I have replaced both. I have recently reassembled the trans and found a binding when rotating the output shaft at one point. I also found when mating the trans to the overdrive that I could not insert a ss lock wire to pull and hold the pump down as there was not enough room beneath the roller.
I'm thinking that the diameter of the pump roller has been increased or I have a pump roller from another laycock overdrive. I don't remember who I purchased the pump from but I plan to call John at Quantum to see if he has experienced this issue.
At this point I either break down the unit to replace the new pump plunger or install a copper washer beneath the pump body bottom plug.
Any other ideas?
I'm thinking that the diameter of the pump roller has been increased or I have a pump roller from another laycock overdrive. I don't remember who I purchased the pump from but I plan to call John at Quantum to see if he has experienced this issue.
At this point I either break down the unit to replace the new pump plunger or install a copper washer beneath the pump body bottom plug.
Any other ideas?