Withdrawal
Disconnect the ground wire from the battery.
Attention: When the battery is disconnected, the information in the electronic memory devices, such as the engine trouble memory or the radio security code memory, is erased. When disconnecting the battery, follow the instructions in section "Removing and installing the battery".
Remove oil sump.
M30, M50 engines: Loosen the nut, remove the sprocket together with the chain, after removing the chain tensioner.
Attention: The nuts on the M50 engine are left-hand threaded.
Unscrew oil pump -arrows-.
Pull out the oil pump. At the same time, on the M30 engine, pay attention to the position of the spacer plates between the oil pump and the engine block. On the M50 engine, pay attention to the position of both centering sleeves.
Installation
Check oil pump.
Insert oil pump and tighten screws to 20 Nm.
M20, M30 engines: Screw on sprocket with attached chain. Install tensioner.
Install the oil sump.
Pour oil into the engine. The marks on the stem indicate the oil level in the engine. The difference between the min and max marks is 1 liter.
Lower the car.
Connect ground wire to battery.
After a test drive, check the oil sump for leaks and, if necessary, tighten all bolts carefully.
Oil pump check
Remove oil pump.
Remove cap 1 of oil pickup. Pull out screen 2 and wash in fuel.
Turn the drive shaft and at the same time check the ease of movement of the gears.
Unscrew oil pump cover -arrows- and remove gears.
Check the housing and cover for cracks and the gears for wear.
Remove the overload protection valve, to do this, squeeze it with special pliers and pull out the retaining ring 4.
Attention: Washer 5 is pressed by the valve spring, so it must be held with the appropriate rod or wrench head. Pull out the spring and piston 6.
Check the ease of movement of the piston in the housing.
Measure the length of the pressure spring. The set value of the length of the spring in the free state: 44 + 0.2 mm.
Insert the piston, spring 3 in figure W - 1608, as well as the washer and hold with a screwdriver.
Insert retaining ring.
Screw on the oil pump cover with a tightening torque of 9 Nm.
Put on the cover.
Install the oil pump.