Engine body Checking of valve springs Renovating the rocker mechanism Check that the springs do not show any signs of 1. MD2O10, MD2020, MD2030: Remove the screws damage. at the front and rear of the rocker shaft. MD2040: Screw in a M8 screw in the threaded hole i n the front edge of the rocker shaft. Fix the screw head in a vice and pull out the rocker shaft (alt. a withdrawing tool can be used). Max. 2.0 mm (.0787 in) r( jrq p 4 -1 100 0 pso U Iry~ Fig. 23. Checking of linearity Place the valve springs on a level surface and check the linearity with a st square (Fig. 23). Fig. 25. Dismantling of rocker mechanism (MD2040) 2. Dismantle the rocker mechanism.
Remove the rockers, springs and washers. 3. Clean the parts. Observe special care with the rocker shaft's oil channels and oil holes in the rock- ers. r Fig. 24. Spring tester Place the spring in a spring tester and check its length both compressed and uncompressed. Fig. 26. Measuring of rocker shaft The springs should maintain the values given in "Tech- nical data". 4. Check the wear on the rocker shaft with a microme- ter (Fig. 26). Diameter min. 11.57 mm (.4555 in). 30