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 fan.
Raise the car.
Remove the protective tray of the engine compartment.
Drain engine oil.
Disconnect the oil level sensor connector.
Loosen the muffler pipe.
Remove left and right engine mounts
Hook up the engine with ropes and raise it on a hoist. In the absence of an appropriate lift, pull the cable through the slats on the engine and slide a sufficiently strong pipe under the cable and support it on sufficiently strong stands or on the grooves of the front fenders.
Attention: Do not support the pipe on the front fenders.
M20 engine: Unscrew the reinforcing trims.
Loosen the oil dipstick guide tube bolt. Pull the guide tube out of the oil sump.
Loosen the screws and remove the oil pan. The figure shows the M50 engine (4-valve). To loosen both rear bolts -arrows-, a narrow socket wrench with extension is required.
Installation
Clean the surfaces of the oil sump and engine block.
Coat the transitions at the covers with a universal sealing compound, eg Curil. For the M50 engine, BMW prescribes the use of an elastic mass "3 Bond 1207B black".
Glue a new gasket with grease, then check the position of the gasket.
Install oil sump and tighten bolts by hand. Then tighten the bolts to 10 Nm.
Screw on reinforcement strips.
Insert guide tube with new O-ring and screw down.
Connect the oil level sensor wire.
Tighten the engine mounts with a tightening torque of 45 Nm.
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.
Install the engine compartment undertray.
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.
M30 engine
Remove air filter.
Remove coolant expansion tank.
Remove the protective tray of the engine compartment.
Loosen the pump tensioner and swing to the side.
Unbolt the oil line bracket.
Unbolt muffler bracket.
Installation is carried out in the reverse order.
1 oil sump
2 hairpin
3 Aluminum O-ring
4 Cork
5 Gasket
6 Bolt
7 Lid
8 Rubber tip
9 O-ring
11 Nut
12 Guide tube
13 O-ring
14 Bolt
15 Oil dipstick