Skutorr
Active member
Have your mechanic (or YOU) remove the oil galley plug and screw-in his (your) QUALITY oil pressure gauge...and then READ and NOTATE the pressure HOT at idle and at running speed, say 3000rpm. Compare the PSI numbers you get to BMWs figures for the bike. It might NOT be the sensors; if the oil pump is a twin gear design, rather than a georotor, it's not very efficient at lower rpms. If the recommended working range is, let's say, 10-75 psi, the warning sensor is calibrated to go on BELOW 10 psi, maybe 5?
Problem is, it might be around ZERO when hot. No way to know without an accurate dial gauge. Remember, they have had lots of problems with the timing chain tensioners, which are oil pressurized. Could be that the volume of flow necessary to keep the galleys all pressurized cannot be supplied by the pump at hot idle. Therefore, as you give it power and accelerate from idle, you have almost NO oil pressure at the engine bearings. This could be a BAD THING.
Oil pump side and end clearances should be very close for max efficiency at idle. When building engines I take apart BRAND NEW oil pumps and blueprint them down to the minimum clearances quoted by the engine manufacturer. Sometimes the NEW pump is more than 20% OVER the maximum allowable clearances for a WORN pump.
It's very possible this might be a QC problem from the pump subcontractor. You should check with BMW and see if there have been any TSBs on any of their Far Eastern Sourced engines, not just the C600/650.
Again, you MUST have them get real data with a GUAGE!!!
Problem is, it might be around ZERO when hot. No way to know without an accurate dial gauge. Remember, they have had lots of problems with the timing chain tensioners, which are oil pressurized. Could be that the volume of flow necessary to keep the galleys all pressurized cannot be supplied by the pump at hot idle. Therefore, as you give it power and accelerate from idle, you have almost NO oil pressure at the engine bearings. This could be a BAD THING.
Oil pump side and end clearances should be very close for max efficiency at idle. When building engines I take apart BRAND NEW oil pumps and blueprint them down to the minimum clearances quoted by the engine manufacturer. Sometimes the NEW pump is more than 20% OVER the maximum allowable clearances for a WORN pump.
It's very possible this might be a QC problem from the pump subcontractor. You should check with BMW and see if there have been any TSBs on any of their Far Eastern Sourced engines, not just the C600/650.
Again, you MUST have them get real data with a GUAGE!!!