ENGINE MECHANICAL — Cylinder Head EM-47 (d) Hand-lap the valve and valve seat with an abrasive compound. 13. INSPECT VALVE SPRINGS (a) Using a steel square, measure the squareness of the valve springs. Maximum squareness: 1.5 mm (0.059 in.) If squareness is greater than maximum, replace the valve spring. (b) Using calipers, measure the free length of the valve spring. Free length: 41.64 mm (1.6394 in.) If the free length is not within specification, replace the valve spring. (c) Using a spring tester, measure the tension of the valve spring at the specified installed length. Installed tension: 16.0 kg (35. lb. 157 N) at 35.0 mm (1.378 in.) If the installed tension is not as specified, replace the valve spring. 14. INSPECT CAMSHAFT AND BEARING CAPS (a) Place the camshaft on V blocks and, using a dial gauge, measure the circle runout at the center journal. Maximum circle runout: 0.03 mm (0.0012 in.) If circle runout is greater than maximum, replace the camshaft.