12 12 011 Checking/replacing spark plugs 11 12 009 Tightening cylinder heads (Inspection II) check/(Inspection III) replace (Inspection I) 12 3 510 12 3 520 R21000190 • Pull off spark plug caps with special puller, BMW No. 12 3 520 . • Remove spark plugs with the spark plug wrench, BMW No. 12 3 510 . • Remove cylinder head cover. e Attention: Catch escaping oil. • Select a gear and turn the rear wheel, or set the piston to TDC on the ignition stroke by turning the belt pulley. Top dead centre on ignition stroke: • The TDC mark is visible and the inlet and exhaust valves in the cylinder concerned are closed. • Tighten cylinder head nuts. Tightening procedure after 1,000 km (600 miles) 1.
Tighten the cylinder head nuts one after the other in diagonally opposite sequence 1.1. Slacken off one nut at a time 1.2. Tighten nut to initial torque.................... 20 Nm 1.3. Tighten nut to specified wrench angle...... 180 ° 2. Slacken/retighten M10 screw................ 40 Nm 00.54 R2100033 R2100033 0 Attention: Do not bend electrodes - risk of breakage! Spark plug:..................................NGK BKR 7 EKC Electrode gap: ........................ 0.8 mm (0.0314 in) Wear limit:................................ 1.0 mm (0.0393 in) X Tightening torque: Spark plug NGK BKR7EKC.......................... 25 Nm R21000370 R21000370