Service and Maintenance 6.9 Additional Maintenance Work © 26 111 0 © 25 746 2 Otherwise the glow lamps are defective or the transmission line interrupted. 6.9.1 Check fastenings 6.9.2 Checking the function of the glow plugs With perfect function, the air-intake pipe 4 warms up near the glow lamps 2 from pre- glowing. Cylinder head cover 1 Air intake manifold 2 Connection sockets Exhaust line 3 Engine mounts 4 © 2001 6 © 26 111 0 © 26 111 0 © 24 717 1 © 24 717 1 © 25 746 2 © 25 746 2