Removal and installation valves (BMW 3 Series E30)

Caution: On 316i, 318i models, the exhaust valves are sodium filled to improve heat dissipation. They cannot be melted down or used as a tool (for example, as punches). Explosive! Also, these valves should not be simply thrown away. To dispose of them, saw the valve with a hacksaw in the middle of the valve stem into 2 parts. Do not allow the valve to come into contact with water. Then throw the sawed parts of the valve into a bucket of water and step aside.

Caution: When sodium comes into contact with water, a rapid chemical reaction occurs, during which the sodium burns.

Removal

Caution: When reinstalling the valve drive parts, they must be installed in their original positions. To do this, when removing the parts, they must be folded in the order of installation.

Remove the rocker arms (see section "Removal and installation rocker arms")



Compress the valve springs using the BMW 111040 tool and remove the valve crackers "C".

Note: A standard valve compression tool can also be used to compress the springs. Depending on the tool used, it may be necessary to remove the intake or exhaust manifold.

Unload the springs and remove the upper spring cup, valve spring, and lower spring cup.

Remove the valve stem seals with a special tool. The best tools for this are the valve stem seal pliers 791-5 or the inertial puller 791-2 from HAZET.

Pull the valve out of the cylinder head towards the combustion chamber.

Remove the next valve.

Installation

Before installing the valves, check the valve guides and possibly lap the valve seats.

Caution: When installing a new valve, lapping the valve seat is mandatory.

Remove burrs from the contact surface of the valve stem with crackers.

Lightly lubricate the valve stem and guide with engine oil and insert the valve.



Lightly lubricate with engine oil and fit the oil deflector ring "A" using the appropriate tool "D" until it stops.

Caution: To avoid damaging the oil deflector ring, place the mounting sleeve "H" on the valve stem before installing it. If the mounting sleeve is missing, cover the contact surfaces of the valve crackers with smooth adhesive tape. Remove the adhesive tape after installing the oil deflector ring.

Insert the lower valve spring cup.

Insert the spring and the upper valve spring cup. Install only springs with the same length, manufacturer's marking and wire thickness.

Note: Since September 1982, springs with a length of 38±1 mm are installed (previously, springs with a length of 37±1 mm were installed). When installing a new cylinder head on an engine produced before September 1982 and simultaneously replacing the old valve springs, it is necessary to place a 1 mm thick spacer washer under the valve head. Cylinder heads of later production are marked with the letter "5" on the inlet and outlet valve sides.

Compress the valve spring and insert the crackers. Slowly release the valve spring, ensuring that the crackers are seated correctly.

Install the next valve. Be careful not to confuse the inlet and outlet valves.

Install the rocker arms (see section "Removal and installation rocker arms").