How is the oil system primed and pressure verified after overhaul?

How is the oil system primed and pressure verified after overhaul?

• A. Start the engine immediately after priming to confirm oil pressure.
• B. Measure coolant temperature to infer oil pressure.
• C. Visual inspection of oil filter for color.
• D. Prime the oil system, rotate engine to fill bearings, and verify oil pressure within spec using the designated instrument.

Answer: (D)

Priming and verifying oil pressure after overhaul ensures the engine’s oil passages are filled and the bearings are actually being lubricated before normal operation. Start by priming the oil system so the pump and all galleries and bearings are coated with fresh oil. This prevents a dry start that could damage bearings as soon as the engine turns over. Next, rotate the engine to circulate the oil and seat moving parts, making sure oil reached all critical surfaces. Finally, verify the oil pressure with the designated instrument and confirm it’s within the specified range for the engine at the required speeds and temperatures. This combination confirms both the pump is delivering oil and the system isn’t blocked or misadjusted. If the reading isn’t within spec, recheck the oil level, pump installation, relief valve, and oil passages for issues.

Priming and verifying oil pressure after overhaul ensures the engine’s oil passages are filled and the bearings are actually being lubricated before normal operation. Start by priming the oil system so the pump and all galleries and bearings are coated with fresh oil. This prevents a dry start that could damage bearings as soon as the engine turns over. Next, rotate the engine to circulate the oil and seat moving parts, making sure oil reached all critical surfaces. Finally, verify the oil pressure with the designated instrument and confirm it’s within the specified range for the engine at the required speeds and temperatures. This combination confirms both the pump is delivering oil and the system isn’t blocked or misadjusted. If the reading isn’t within spec, recheck the oil level, pump installation, relief valve, and oil passages for issues.