Cylinder head, valve seals, replace

# Cylinder head, valve seals, replace, S14

Remove cylinder head
Remove spark plugs
Mount cylinder head on an appropriate stand
Install a valve spring compressor on the valve, compress the spring, remove the retainers (green arrow), release the valve springs and remove the valve. |
All valves must be kept in order and returned to the same position when reassembled.
Remove valve stem seals with BMW special tool 11 1 250 or equivalent pliers. Pliers should have a rounded head so as to prevent crushing the valve guides. |
Lift off valve spring seats. Failure to lift these off now will result in them falling off during valve lapping procedure, which could lead to loss or damage of seats. |

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Installation

Check valve guides for wear
Place head upside down and apply a small amount of valve grinding compound to the seating surface of the valve. Place the valve in the guide, use a readily available "valve lapper" to spin the valve in the guide. Use a rubbing motion with the lapper between your hands so the lapper is constantly changing direction. Every 2 or 3 strokes, rotate the valve an extra 1/4 turn so that the mating surfaces are being properly and evenly ground. Remove valve and clean it and the seat.

CAUTION: It is very easy to get confused after you turn the head upside down and lap the valves into the wrong cylinders. When disassembling the head, place the valves on a numbered board or piece of cardboard. Take note of the orientation of the now upside down head , and apply the correct valves to each cylinder.

Lubricate valve stem with engine oil and insert in guide. Clean spring seats and place on cylinder head (arrow) |
Place plastic tube included in valve seal set over valve stem and slide valve stem seal over valve and onto the guide. |
Press the seal onto the guide with BMW special tool 11 1 200 or an equivalent tool. Valve seal should be installed evenly and to the stop. If possible, obtain a tool specifically designed for pressing on valve stem seals, install seals by hand, do not use a hammer on the tool to seat the seal. |
Place springs over valves. Install caps on springs. Compress springs and install retainers. Placing the retainers is made easier by dabbing grease on the inner surface. The grease helps hold it in place on the valve stem while you release the spring. A grease covered screw driver is a simple, yet effective, tool for installing the retainers. |
Note : It is recommended to replace the valve spring caps and retainers. These items are cheap and can cause disastrous damage if they fail.
Re-install cylinder head |
Adjust valves.

### Torques :

Spark plugs | : | 20 ± 5 Nm ( 14.5 ± 3.5 ft lbs.)

### Part numbers :

Valve seals (2 kits required) | : | 11 34 9 059 171
Valve spring | : | 11 34 1 312 704
Valve spring cap (16 required) | : | 11 34 1 307 922
Valve spring retainer (32 required) | : | 11 34 1 307 136

E30 M3 Repair Manual V2.7. Copyright ©1999-2001 Koala Motorsport & Brett Anderson