Engine body Fitting of cylinder head 1. Clean the surface of the cylinder head and cylinder block. Remove any rust or soot from the screw ho- 1st tightening MD2O10. MD2020 10 Nm (7.40 ft.lbs) MD2030 20 Nm (14.80 ft.lbs) MD2040 30 Nm (22.10 ft.lbs l es and threads for the cylinder head screws. 2. Fit on the new cylinder head gasket. 2nd tightening 3. Apply grease containing molybdenum disulphide on the cylinder head screws. MD2O10, MD2020 20 Nm (14.80 ft.lbs) MD2030 35 Nm (25.80 ft.lbs) MD2040 70 Nm (51.70 ft.lbs) NOTE! The screws are surface treated and must not be cleaned with a steel brush. Note:
I f the cylinder head is painted the mating sur- faces for cylinder head screws must be free from paint, otherwise the clamping force in the screw union will be adversely affected. Final tightening MD2O10, MD2020 35-40 Nm (26-30 ft.lbs) MD2030 50-53 Nm (37-39 ft.lbs) MD2040 90-95 Nm (66-70 ft.lbs) 4. Check that the tubular pins (guides) are fitted in the block. Place the two rear cylinder head screws in the cylinder head and fit the head. e Fig. 32. Fitting of the rocker mechanism (MD2040) 6. Fit the pull rods (2), valve caps (3, MD2040 and l ater versions of 2010, 2020,2030) and rocker mechanism (1). 7. Adjust the valve clearance as per directions on page 34. Fit the valve cover. Fig. 30.
Tightening diagram, MD2O10 Fig. 33. Fitting of oil pressure pipe (cylinder block - cylinder head / rocker mechanism) Fig. 31. Tightening diagram MD2020, MD2030, MD2040 8. Fit the oil pressure pipe between the block and 5. Tighten the cylinder head screws in three stages as cylinder head (rocker mechanism on MD2040). per the following. See tightening diagrams Fig. 30- 31. Tightening torque 10-13 Nm (7.4-9.6 ft.lbs). 32