OMS / VRO Pump Verifying Oil Pump Delivery
Posted: Fri Aug 19, 2022 11:47 am
I recently installed a new OMS Pump Kit (OEM BRP P/N 5007423) on my 1986 Johnson 150 (J150TXCDC).
INSTALLATION AND TESTING
In addition to a new pump, I installed a new oil tank, inline pulse limiter, and hoses with proper BRP Ratchet Clamps. During the install, I tested the new oil tank and confirmed the low oil alarm will be functional. In addition, with 50:1 premix gasoline (XD100) in tank and flushed through my fuel lines, I installed a 20” clear hose to the oil inlet of the OMS Pump and filled the hose with oil to confirm pump operation at approximately 1,000 RPM. I did not test pumping at the higher RPMs given the related speed and considering safety around the powerhead. The pump drew in oil. The pump pulsed out oil through the clear hose, and I confirmed the no oil alarm worked after oil was exhausted from the clear line. I then removed the clear hose and attached the flushed-out purged inlet hose from the oil tank to the OMS pump. The no oil alarm stopped sounding confirming the pumps ability to self-prime.
VERIFYING OIL DELIVERY
Over a seven day period I ran a total of 63.6 gallons of pre-mixed fuel (gasoline and XD100) through the engine.
I verified the engine was consuming oil.
I tracked the fuel usage using my Garmin GFS 10 Fuel Sensor, which I find to be very accurate. Approximately three-quarters of the total run hours were low speed trolling at about 800-RPM, and one-quarter of the total hours were running at 2,800-RPM or above. Prior to starting this oil consumption test I made sure the oil tank was filled to the rim and made sure no air pockets were in the oil tank. After running a total of 63.6 gallons of premix through the engine, I topped off the oil in the oil tank again releasing any air pockets and filling to the rim. To my surprise, I only added 104 ounces of XD100, suggesting only 104-ounces were consumed. This results in an average fuel to oil ratio of 78:1.
I was confident the OMS oil pump was pumping oil. However, I expected a fuel to oil ratio closer to 60:1. Any thoughts on whether oil consumption is appropriate for my estimated running time at the above speeds? I understand the OMS oil output is "somewhat leaner at idle. Would this account for my 78:1 average fuel to oil ratio?
INSTALLATION AND TESTING
In addition to a new pump, I installed a new oil tank, inline pulse limiter, and hoses with proper BRP Ratchet Clamps. During the install, I tested the new oil tank and confirmed the low oil alarm will be functional. In addition, with 50:1 premix gasoline (XD100) in tank and flushed through my fuel lines, I installed a 20” clear hose to the oil inlet of the OMS Pump and filled the hose with oil to confirm pump operation at approximately 1,000 RPM. I did not test pumping at the higher RPMs given the related speed and considering safety around the powerhead. The pump drew in oil. The pump pulsed out oil through the clear hose, and I confirmed the no oil alarm worked after oil was exhausted from the clear line. I then removed the clear hose and attached the flushed-out purged inlet hose from the oil tank to the OMS pump. The no oil alarm stopped sounding confirming the pumps ability to self-prime.
VERIFYING OIL DELIVERY
Over a seven day period I ran a total of 63.6 gallons of pre-mixed fuel (gasoline and XD100) through the engine.
I verified the engine was consuming oil.
I tracked the fuel usage using my Garmin GFS 10 Fuel Sensor, which I find to be very accurate. Approximately three-quarters of the total run hours were low speed trolling at about 800-RPM, and one-quarter of the total hours were running at 2,800-RPM or above. Prior to starting this oil consumption test I made sure the oil tank was filled to the rim and made sure no air pockets were in the oil tank. After running a total of 63.6 gallons of premix through the engine, I topped off the oil in the oil tank again releasing any air pockets and filling to the rim. To my surprise, I only added 104 ounces of XD100, suggesting only 104-ounces were consumed. This results in an average fuel to oil ratio of 78:1.
I was confident the OMS oil pump was pumping oil. However, I expected a fuel to oil ratio closer to 60:1. Any thoughts on whether oil consumption is appropriate for my estimated running time at the above speeds? I understand the OMS oil output is "somewhat leaner at idle. Would this account for my 78:1 average fuel to oil ratio?