What reads the oil pressure?
​Oil pressure is determined by the resistance oil faces when flowing through the oil passages of the engine. Oil pressure is indicated by the oil pressure gauge and should show a steady value around 20 minutes after engine start-up, when the oil has reached its operating temperature.
What causes oil pressure to drop on a Harley Davidson?
Too much clearance between the gerotors on the feed side of the pump or too much clearance between the face of the cam plate and feed gerotor will cause erratic oil pressure as described by the OP. A partial blockage in the feed line to the cam case could also cause the erratic oil pressure but two sources listed above are the usual suspects.
What to do when oil pressure drops on a dolt?
Dolt has you covered above. As suggested, polish the plunger and clean the bore so that it (the plunger) slides easily in the port with no binding. While you are in there, pull the plate and check out the pump. Make sure to use new orings when reassembling and ensure the pump is aligned.
Why does my oil pressure drop when I cruise?
A partial blockage in the feed line to the cam case could also cause the erratic oil pressure but two sources listed above are the usual suspects. Oil pressure should read 40-50psi on start up but drop to 8-12 when warmed up and rise to about 32-34psi at cruise and stay there.
What should oil pressure be at start up?
Oil pressure should read 40-50psi on start up but drop to 8-12 when warmed up and rise to about 32-34psi at cruise and stay there. Anything else indicates a fault in the system which could be a faulty gauge or sending unit but the OP has addressed those already. 70 mph is cruising speed on most roads in Texas.
What should the oil pressure be on a Harley Davidson?
If you could shed any light on this matter I would greatly appreciate it. Those oil pressure numbers are typical for your m/c. If the motor rebuild is unknown, or questionable, we suggest inspecting your cam chain tensioners. If you are interested in looking into keeping your oil cooler; check out Love Jugs.
A partial blockage in the feed line to the cam case could also cause the erratic oil pressure but two sources listed above are the usual suspects. Oil pressure should read 40-50psi on start up but drop to 8-12 when warmed up and rise to about 32-34psi at cruise and stay there.
Dolt has you covered above. As suggested, polish the plunger and clean the bore so that it (the plunger) slides easily in the port with no binding. While you are in there, pull the plate and check out the pump. Make sure to use new orings when reassembling and ensure the pump is aligned.
Oil pressure should read 40-50psi on start up but drop to 8-12 when warmed up and rise to about 32-34psi at cruise and stay there. Anything else indicates a fault in the system which could be a faulty gauge or sending unit but the OP has addressed those already. 70 mph is cruising speed on most roads in Texas.