4 - 20ENGCAMSHAFT, ROCKER ARMS AND VALVES2.Check: Rocker arms Rocker arm shaftsDamage/wear → Replace.*****************************************************Checking steps: Check the two contact areas on the rockerarms for signs of abnormal wear.1) Rocker arm shaft hole2) Camshaft lobe contact surfaceExcessive wear → Replace. Check the surface of the rocker arm shafts.Blue discoloration/pitting/scratches →Replace/check lubrication. Measure the inside diameter a of the rockerarm holes.Out of specification → Replace. Measure the outside diameter b of therocker arm shafts.Out of specification → Replace. Calculate the clearance by subtracting therocker arm shaft outside diameter from therocker arm inside diameter.Clearance greater than 0.08 mm (0.003 in)→ Replace the defective part(s).*****************************************************Rocker arm inside diameter:12.000 ~ 12.018 mm(0.4724 ~ 0.4731 in)Rocker arm outside diameter:11.981 ~ 11.991 mm(0.4717 ~ 0.4721 in)Rocker arm to shaft standardclearance:0.009 ~ 0.037 mm(0.0004 ~ 0.0015 in)
