ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 007-029   Lubricating Oil Pressure Regulator (Main Rifle)

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  Some solvents are flammable and toxic. Read the manufacturer’s instructions before using.

Thoroughly clean the area around the pressure regulator plug with clean solvent to prevent debris from falling into the plunger bore when the plug is removed.

Remove the threaded plug, spring, and plunger.

Service Tip: The plunger normally can be removed by inserting one finger into the plunger bore until snug and pulling down. If the plunger can not be removed in this manner, the plunger is probably stuck and will require removal of the housing for cleaning the plunger.

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  Some solvents are flammable and toxic. Read the manufacturer’s instructions before using.

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

NOTE: If the plunger bore requires cleaning, remove the housing to avoid flushing debris into the engine.

Thoroughly clean all components with clean solvent.

Dry with compressed air.

Inspect the plunger and plunger bore. Polished areas on the plunger and bore are acceptable.

Verify that the plunger moves freely in the bore.

Install a new sealing o-ring on the threaded plug and lubricate with clean engine oil. Install the pressure regulator assembly.