MR1 oil flow explained

[cybuch]

Here is what I found and I am going to lay it out for anyone else looking for answers for MR1 oil flow diagram. Here is how it flows, from my understanding on tearing a motor down and rebuilding.

• The oil starts in the oil pan
• The oil pump sucks it up from there through an oil strainer in the pump gear cover (the output shaft cover)
• Goes through the pump
• Into the oil cooler at the bottom but drops into the tank at the top, this help cool it
• Flows to the bottom of the oil cooler, through another oil strainer (this is where our oil sucker goes down to and stops, durning an oil change)
• Back into the oil pump
• Out of the oil pump into the block
• through the oil filter
• out of the oil filter, splits into two different passages
  • It turns left and goes into the main bearings and connecting rod bearings
    • it drips back into the oil pan
  • It goes straight up, through a 90 degree copper pipe, through the oil pressure switch, into the head
    • hits both cams and then drips back into the oil pan
• starts all over again

It you have low oil pressure, check those two oil strainers first, then look at the motor.