Spark Plugs - BMW R850 Maintenance Manual

Spark Plugs

Tools
T-handle hex –5mm, 6mm
plug wire cap puller
sparkplug socket
short extension
ratchet
rag
hex socket - 6mm
small flashlight
spark plug gauge
torque wrench
anti-seize paste
1. The spark plugs were removed in steps 1 – 9 of the preceding valve
adjustment procedure. Be sure to read the Warning! following step 9 of the valve
adjustment procedure.
2. Replace plugs every 12K miles.
3. Visually inspect the spark plugs and check each for abnormalities – carbon or
oil deposits, burned or cracked electrodes, etc.
4. If installing new plugs (every 12K miles), check that they are still set at the
factory set gap of .031 in (0.8mm).
5. Very lightly coat the plug threads with anti-seize.
6. Install the plugs by hand using only the spark plug socket to avoid any
possibility of cross-threading them.
7. Torque the plugs to 15 ft.lb.(20 Nm).
8. Push the spark plug wire caps firmly onto the spark plugs.
9. Replace the black valve cover strips by putting the two rear tits into place at
the spark plug wire and then pushing the front in until it snaps into place.
10. Replace the valve cover protectors using the 5mm hex T-handle – start the
bottom center bolt first - short screw goes to the front.
11. Replace the alternator cover – try to get the oil line brackets lined up first and
start the top right bolt first since you may need to push the oil line bracket to get
the bolt started – same with the bottom right bolt.
Parts
spark plugs
12