Oil pump parts
1. Pump (front cover); 2. Spring; 3. Plug; 4. Gasket; 5. Pressure reducing valve; 6. Gasket; 7. Driven rotor; 8. Leading rotor; 9. Pump cover; 10. Crankshaft oil seal
Removing
1. Remove belts and tensioner pulley.
2. Remove the tray.
3. Remove the crankshaft pulley and front cover.
4. Remove 7 screws (indicated by arrows) and remove the oil pump housing.
5. Remove the remnants of the seal from the split planes of the pump and cylinder block, wash the planes with a solvent.
6. Remove the driving and driven rotors.
7. Disassemble the pressure reducing valve. Unscrew the plug carefully, holding it with force, as the valve spring is very stiff.
Examination
1. Wash all parts in solvent, check for wear and damage.
2. Check the condition of the sliding surface of the pressure reducing valve piston and the spring. If damage is found, replace the piston complete with spring.
3. Check the gap between the driven rotor and the housing with a feeler gauge.
4. Check end clearance between rotor and cover.
5. Check the gap in the engagement of the rotors.
6. If the clearances are out of specification, replace the rotors as a set. Replace pump housing if necessary (front cover).
Installation
1. Lubricate the rotors with engine oil and install in the housing.
2. Lay technical vaseline in the pump cavity, lay the gasket, put the cover on and tighten the screws.
3. Lubricate the pressure reducing valve piston with fresh engine oil and install the valve parts.
4. Install a new chain cover gasket onto the guide pins.
5. Replace the cover oil channel gasket.
6. Install the chain cover by engaging the oil pump drive rotor with the crankshaft drive gear.
7. Install the rest of the parts in reverse order.
8. Fill with oil, start the engine, check for leaks.