Defender 90 (LD) V8-4.0L (1997)
Oil Pressure Regulator Valve: Service and Repair
Oil Pressure Regulator Valve
NOTE: Overhaul procedures for the oil pump and oil pressure relief valve are limited to carrying out dimensional checks. In the event of wear or
damage being found, a replacement timing cover and oil pump assembly must be installed.
REMOVAL
1. Remove circlip.
2. Remove relief valve plug, remove and discard O-ring.
3. Remove relief valve spring and piston.
INSTALLATION
1. Lubricate new O-ring with engine oil and install to relief valve plug.
2. Lubricate relief valve spring, piston and piston bore with engine oil.
3. Assemble piston to relief valve spring, insert piston and spring into piston bore.
4. Install relief valve plug, depress plug and install circlip.
5. Ensure circlip is fully seated in groove.