N14 Base Engine Troubleshooting and Repair Manual – 007-049   Lubricating Oil Pump Signal Tube Orifice

WARNING  Carefully remove the capscrew. The pressure regulator spring is under compression. Personal injury can result. Wear face and eye protection.

Remove the lubricating oil pressure regulator plunger. Refer to Procedure 007-029.

Remove the DFC signal line.

Remove the 7/16-20 UNF straight thread with o-ring seal adapter from the lubricating oil pump cover.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

Use an acetylene torch tip cleaner or equivalent that is 1.0 mm [0.040 in] or less in diameter to clean the orifice.

The diameter of the orifice is 1.0 mm [0.040 in]. Do not attempt to drill out the orifice or use a larger diameter wire to clean the orifice.

Use solvent and an air solvent gun to wash the debris from the orifice and the pressure regulator bore in the lubricating oil pump.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

Clean the inside of the signal line and the 7/16-20 UNF straight thread with o-ring seal adapter with solvent and an air solvent gun.

Inspect the signal line for cracks or damage.

Install the lubricating oil pressure regulator plunger. Refer to Procedure 007-029.

Install the DFC signal line.

Operate the engine until the water temperature reaches 82°C [180°F], and check the oil pressure.

If the oil pressure problem still exists or occurs again soon after the above procedure has been completed, remove the lubricating oil pump for disassembly and a thorough cleaning. Refer to Procedure 007-031.