Never use old valves as punches or any other type of tool. The valve may crack and break if struck causing personal injury. Some exhaust valves, such as those installed in the late models 4 and 6-cylinder BMW engines are sodium filled. Do not cut the valve stems or throw them into a standard waste container for disposal. Take the old valves to a BMW dealer or machine shop for proper disposal. Sodium is extremely reactive and can be an explosive hazard if exposed to air and water.
REMOVAL & INSTALLATION
See Figures 1, 2, 3 and 4
It is understood that the cylinder head has been removed before performing valve removal. On all engines the camshafts must be removed. The rocker shafts and rocker arms must be removed on 2.5, 2.8L, 3.0L and 3.2L engine
- The factory BMW valve spring compressor and removal tool mounts the cylinder head on a support tray with projections that fit into the combustion chamber. This supports the valves as the springs are compressed and the retainers removed. The BMW tool number for the spring compressor is 11 1 060. There is a different number for the support tray for each engine. Consult with your dealer if you wish to use the factory tools.
- If an aftermarket tool is used, safely and securely support the head while placing the valve spring compressor. Compress the spring.
- Remove the valve spring retainers and carefully release the tension on the spring. Use a magnet to retrieve hard to pick up retainers.
- Remove the spring and upper retainer. Remove the valve from the combustion chamber side of the head.
- Remove the valve stem seal with a removal pliers or equivalent. Remove the lower spring washer or retainer.
- Lubricate the valve guide and stem. Place the valve in the valve guide. Put the lower retainer into place. Wrap the end of the valve stem with thin tape or use BMW tool 11 1 340, 11 1 350, 11 1 360, 11 1 380 depending on the engine to protect the valve stem seal as it is slid over the retainer grooves in the valve stem.
- Press the new valve stem seal into place with tool 11 1 200 or equivalent. The tool fits over the valve stem and provides even pressure to the seal as it is pressed down.
- Install the valve springs. If the valve springs are replaced, the inner and outer springs are replaced as a set. Do not mix new and used inner and outer springs. The color codes must match.
- Place the upper retainer on the springs and compress with the valve spring compressor. Place the retainer locks into the grooves. Release the compressor slowly to make sure the retainers are in place.
See Figures 5 and 6
Inspect the valve faces and seats (in the cylinder head) for pits, burn spots and other evidence of poor seating. If the valve face or seat is in such bad shape that the head of the valve must be ground in order to true up the face, discard the valve because the sharp edge will run too hot. Check the edge thickness of the valve. Valve wear will cause this thickness to reduce. It is recommended that any reaming or resurfacing (grinding) be performed by a reputable machine shop.
Check the valve stem for scoring and/or burned spots. Check the stem lock retainer grooves for wear. Check the end of the stem for wear. If not noticeably scored or damaged, clean the valve stem with a suitable solvent to remove all gum and varnish. Clean the valve guides using a suitable sol