3) flatness Measure flatness of the intake/exhaust manifolds fitting surfaces on the cylinder head using a straight edge and a feeler gauge. 4) Hydraulic test Hydraulic test method for the cylinder head is same as that for cylinder block. 3.2. 3. Valve and valve guide 1) Valve Clean the valves with clean diesel oil, then inspect them as follows : Valve stem outer diameter Measure the valve stem outer diame- ter at 3 positions. (top, middle, and bottom) If the amount of wear is beyond the limit, replace the valve. Valve stem 밸브 스템 EFM2036I Valve seat contacting faces Check the valve seat contacting faces for scratches or wear, and correct the faces with grinding paper as necessary.
Replace if severely damaged. Valve head thickness Measure the valve head thickness, and replace the valve if the measured value is beyond the limit. EFM2037I - 62 - INSPECTION AND MEASUREMENT Standard Limit 0.05 mm 0.2 mm Dimension Description Standard Limit Intake valve stem N10.950 ~ N10.970 mm N10.87 mm Exhaust valve stem N10.935 ~ N10.955 mm N10.84 mm Dimension Description Standard Limit Intake valve 1.5 mm 1 mm or less Exhaust valve 1.5 mm 0.9 mm or less