Mercedes-Benz 500 SEC Operator's Manual page 120

Spark Plugs
Remove and install spark plugs only
with socket wrench from the vehicle
tool kit or a recommended spark plug
wrench.
Tightening torque:
15-22 ft. lb. (20 - 30 Nm).
For approved spark plugs see
"Technical Data".
500 SEC
Layout of Poly-V-belt Drive
1 Automatic belt tensioner
2 Crankshaft
3 Air conditioning compressor
4 Fan
5 Air pump
600 SEC
6 Alternator
7 Idler pulley
8 Power steering pump
9 Coolant pump
For dimensions of the poly-V-belt, see
Technical Data in Index.
120