Removal and disassembly
Remove the sump or the bottom of the sump.
Remove mounting bolts (arrows) on the cylinder block and on the crankshaft bearing cap.
Remove oil pump with holder. For 8-cylinder engines, after loosening the fastening bolts, loosen the bolt on the gear wheel (asterisk), tilt the oil pump back and remove the bolts. Disconnect the sprocket from the pump using a screwdriver.
Remove sprocket from chain.
Open the intake pipe. Remove the mesh after removing the clamping ring.
Unbolt the lower part of the oil pump housing.
Remove the pump shaft with gear and drive shaft from the upper part of the housing.
Installation
Clean parts and check for wear. If the housing or gears are damaged, it is recommended to replace the entire pump.
The oil pump is assembled in the reverse order of disassembly.
Check that the pump gears turn freely.
Install the suction pipe with a new gasket. Check adapter for tight fit.
Install the oil pump with holder. If there is a misalignment, then you need to slightly turn the crankshaft forward and backward until the pump is in the correct position.
For 8-cylinder engines, attach the sprocket to the chain.
Fit the oil pump onto the sprocket. It is necessary to insert the tension sleeve in the sprocket into the groove of the drive shaft.
Tilt the oil pump back, install the bolts and tighten them.
Screw in the fixing screws and tighten.
On 8-cylinder engines, make sure that the chain tensioner pressure spring does not rotate when the bolts are tightened. Hold the compression spring with a screwdriver.
Then install the oil pan.