3) Retightening cylinder head bolts after repairs by authorized specialist personnel (engine cold After the first 10 to 20 hours of operation after a repair turn the cylinder head bolts by a further 90 ° (1/ or warm) 4 revolution) in the order shown in above figure. ((2) Tightening cylinder head bolts after repair) The cylinder head bolts to be retightened must not be loosened first, but simply tightened by a further 90 ° (1/4 revolution) from their actual position. Attach the sticker “First retightening of cylinder head bolts ...”(Remove any other stickers which may already be attached).
After the first 400 hours of operation after a repair tighten cylinder head bolts 1 to 4 in the order shown in above figure ((1) Retightening cylinder head bolts on new engines) again by a further 90 ° (1/4 revolution). The two outside screws (intake and exhaust side) must not be retightened. NOTE : When a cylinder head has been removed the cylinder head gasket must always be changed. Maintenance of Major Components - 146 -