Service and Maintenance 6.6 Adjustments © 19 691 2 Adjust valve clearance if necessary: - Release locknut 4. - Use allen key 7 to turn setscrew 5 so that the correct clearance is attained after locknut 4 has been tightened. Check and adjust valve clearance on all cylinders. Reinstall cylinder head cover with new gasket if necessary. Remove the cylinder head cover. Position crankshaft as per schematic, see 6.6.1.1. Before adjusting valve clearance, allow engine to cool down for at least 30 minutes. The oil temperature should be below 80 °C.
Check valve clearance 1 between rocker arm / tappet contact face 2 and valve stem 3 with feeler gauge 6 (there should be only slight resistance when feeler blade is in- serted). For permissible valve clearance, see 9.1. For high output settings, the engines are fitted with an additional oil nozzle to lubricate bearings. If necessary, readjustment may only be carried out in an authorised specialist workshop! 6.6.1 Check valve clearance, adjust if necessary © 2001 6 © 19 691 2 © 19 691 2 © 25 893 0 © 25 893 0