F3B ENGINE 199 T RAKKER E URO 4/5 540622 Valves Decarbonizing and checking valves Figure 132 Figure 131 71718 Remove the carbon deposits on the valves with a wirebrush. Check that the valves show no signs of seizure or cracking and check with a micrometer that the valve stem diameter comes within the required values (see Figure 132); replace the valves if it does not. 48625 * Measurement to be made after driving in the valve guides MAIN DATA OF VALVES AND VALVE GUIDES Check with a micrometer that the diameter of the valve stems is as indicated. If necessary, grind the valve seats with a grinding machine, removing as little material as possible.
540661 Valve seats Regrinding q replacing valve seats NOTE The valve seats are reground whenever the valves or valve guides are ground and replaced. Figure 133 1 2 73555 MAIN DATA OF VALVE SEATS 1. Intake valve seat q 2. Exhaust valve seat Print 603.93.641 Base q November 2006