Engine body 6. Tighten the main bearing cap. Tightening torque, see Technical data. Replacement of rear crankshaft seal The seal consists of a rubber ring and becomes access- i ble after the adapter plate at the back of the flywheel housing, the flexible coupling, flywheel* and flywheel housing have been removed. *Note: Mark up the position of the flywheel in relation to the crankshaft (simplified fitting). 1. Clean the position for the sealing ring in the cylinder block and the mating surface on the flywheel hous- i ng. Fig. 80. Checking of axial clearance 7. Check that the axial clearance does not exceed 0.5 mm (.0196 in). Replacement of gear ring on the flywheel 1.
Mark up the position of the flywheel in relation to the crankshaft (to simplify fitting). Dismantle the fly- wheel. 2. Drill one or a couple of holes in a tooth gap on the gear ring. Split the ring at the drilled hole with a chisel, after which the gear ring can be removed. Fig. 81. Fitting of crankshaft seal 2. Apply an even layer of sealing compound (VP no. 840 879) round the flywheel housing's mating sur- face (screw holes). Apply grease on the sealing lip and fit the seal. 3. Brush clean the mating surface on the flywheel with a steel brush. 4. Heat up the new gear ring in an oven (120-150°C/ 248-302°F) so that the gear ring becomes evenly hot all round. 3.
Fit the flywheel housing, flywheel, the flexible coup- li ng, and the adapter plate. 5. Place the heated gear ring on the flywheel and drive on with a hammer and soft mandrel. The gear ring should then cool in the free air. Tightening torque, see Technical data. 6. Clean the mating surfaces on the flywheel and crankshaft. Check the rear crankshaft seal. Re- place if necessary. 7. Fit the flywheel in the correct position (guide pin on MD2030 and MD2040). Tightening torque, see Technical data. 5 0