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Lubrication System : High Pressure

Jake Mayock

Meet Jake

Jake is a founder of 8020 Media and one of the lead writers at DieselIQ. He has over 10 years of experience in the automotive industry and is the proud owner of a 2002 F-350 7.3 PowerStroke. When Jake isn’t working, he’s usually wrenching on his PowerStroke, single turbo BMW, or Miata track build. Jake delivers tons of knowledge and hands-on experience and is a valuable asset for those looking to take their diesel to the next level. He is highly knowledgeable on Powerstroke and Duramax diesels.

Power Stroke 7.3 Liter Diesel Engine High Pressure Oil Flow

  1. Oil Pressure Sensor
  2. High-Pressure Oil Pump (HPOP)
  3. Cylinder Head
  4. High-Pressure Oil Feed Hoses
  5. High-Pressure Oil Rail
  6. Injector Oil Feed Galleries
  7. Fuel Injectors (8 Req’d)
  8. Oil Pressure Sensor
  9. Oil Pressure Regulator
  10. Engine Front Cover
  11. High-Pressure Oil Pump Reservoir

During initial start or cold start, the Power Stroke 7.3 Liter Diesel Engine high-pressure oil pump receives unfiltered oil from the left side valve lifter oil gallery through the anti-drain back check ball valve. Once the engine starts or during warm engine starts, the check ball closes and the high-pressure oil pump receives filtered oil from the high-pressure oil pump reservoir.

The high-pressure oil pump pumps the oil under extremely high pressures 4,115-20,577 kPa (600-3,000 psi) through the left and right side high-pressure supply hoses to the high-pressure oil rails (integral to the cylinder heads). Once in the oil rail, the oil is fed to the fuel injector bores through four oil feed galleries drilled and machined in the cylinder head. The high-pressure oil then actuates the fuel injectors.

Check out our following article for information on the 7.3 PowerStroke low pressure oil system.

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