Yamaha Fz6n Manual
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Page 241
5-21 CYLINDER HEADENG NOTE: 19 Nm (1.9 mkg, 14 ftlb) 50 Nm (5.0 mkg, 36 ftlb) 12 Nm (1.2 mkg, 8.7 ftlb) NOTE: EAS00233 INSTALLING THE CYLINDER HEAD 1. Install: gasket New 1 dowel pins 2 2. Install: cylinder head Pass the timing chain through the timing chain cavity. 3. Tighten: cylinder head bolts 1 10 1st 2nd cylinder head bolts 11, 12 Lubricate the cylinder head bolts with engine oil. Tighten the cylinder head bolts in the proper tightening sequence as shown and torque them in two...
Page 242
5-22 Order Job / Part Q’ty Remarks 1 2 3 4 5 6 7 8 9 10 11 12 13Remove the valves and valve springs Cylinder head Intake valve lifter Intake valve pad Intake valve cotter Intake valve upper spring seat Intake valve spring outer Intake valve spring inner Intake valve stem seal Intake valve lower spring seat Intake valve Intake valve guide Exhaust valve lifter Exhaust valve pad Exhaust valve cotter8 8 16 8 8 8 8 8 8 8 8 8 16Remove the parts in the order listed. Refer to “CYLINDER HEAD”. Refer to “REMOVING...
Page 243
5-23 VALVES AND VALVE SPRINGSENG Order Job / Part Q’ty Remarks 14 15 16 17 18 19Exhaust valve upper spring seat Exhaust valve spring Exhaust valve stem seal Exhaust valve lower spring seat Exhaust valve Exhaust valve guide8 8 8 8 8 8 For installation, reverse the removal procedure. Refer to “REMOVING / INSTALLING THE VALVES”.
Page 244
5-24 VALVES AND VALVE SPRINGSENG NOTE: NOTE: NOTE: NOTE: EAS00238 REMOVING THE VALVES The following procedure applies to all of the valves and related components. Before removing the internal parts of the cylin- der head (e.g., valves, valve springs, valve seats), make sure the valves properly seal. 1. Remove: valve lifter 1 valve pad 2 Make a note of the position of each valve lifter and valve pad so that they can be reinstalled in their original place. 2. Check: valve sealing Leakage at the valve...
Page 245
5-25 VALVES AND VALVE SPRINGSENG NOTE: Valve spring compressor 90890-04019, YM-04019 Valve spring compressor attachment 90890-04108, YM-01253 4. Remove: upper spring seat 1 valve spring outer 2 valve spring inner (intake only) 3 valve 4 valve stem seal 5 lower spring seat 6 Identify the position of each part very carefully so that it can be reinstalled in its original place. EAS00239 CHECKING THE VALVES AND VALVE GUIDES The following procedure applies to all of the valves and valve guides. 1....
Page 246
5-26 VALVES AND VALVE SPRINGSENG NOTE: NOTE: 2. Replace: valve guide To ease valve guide removal and installation, and to maintain the correct fit, heat the cylinder head to 100C (212F) in an oven. a. Remove the valve guide with the valve guide remover 1. b. Install the new valve guide with the valve guide installer 2 and valve guide remover 1. c. After installing the valve guide, bore the valve guide with the valve guide reamer 3 to obtain the proper valve-stem-to-valve-guide clearance. After...
Page 247
5-27 VALVES AND VALVE SPRINGSENG NOTE: 5. Measure: valve margin thickness a Out of specification Replace the valve. Valve margin thickness 0.6 0.8 mm (0.0236 0.0315 in) : 0.5 mm (0.02 in) 6. Measure: valve stem runout Out of specification Replace the valve. When installing a new valve, always replace the valve guide. If the valve is removed or replaced, always re- place the oil seal. Valve stem runout : 0.04 mm (0.0016 in) EAS00240 CHECKING THE VALVE SEATS The following procedure applies to...
Page 248
5-28 VALVES AND VALVE SPRINGSENG NOTE: NOTE: CAUTION: NOTE: Where the valve seat and valve face contacted one another, the blueing will have been re- moved. 4. Lap: valve face valve seat After replacing the cylinder head or replacing the valve and valve guide, the valve seat and valve face should be lapped. a. Apply a coarse lapping compound a to the valve face. Do not let the lapping compound enter the gap between the valve stem and the valve guide. b. Apply molybdenum disulfide oil onto the valve...
Page 249
5-29 VALVES AND VALVE SPRINGSENG j. Measure the valve seat width c again. If the valve seat width is out of specification, reface and lap the valve seat. EAS00241 CHECKING THE VALVE SPRINGS The following procedure applies to all of the valve springs. 1. Measure: valve spring free length a Out of specification Replace the valve spring. Valve spring free length Intake valve spring (inner) 37.0 mm (1.46 in) : 35.2 mm (1.39 in) Intake valve spring (outer) 38.4 mm (1.51 in) : 36.5 mm (1.44 in) Exhaust...
Page 250
5-30 VALVES AND VALVE SPRINGSENG 3. Measure: valve spring tilt a Out of specification Replace the valve spring. Spring tilt limit Intake valve spring (inner) 2.5/ 1.6 mm (0.06 in) (outer) 2.5/ 1.7 mm (0.07 in) Exhaust valve spring 2.5/ 1.8 mm (0.07 in) EAS00242 CHECKING THE VALVE LIFTERS The following procedure applies to all of the valve lifters. 1. Check: valve lifter Damage / scratches Replace the valve lift- ers and cylinder head. EAS00246 INSTALLING THE VALVES The following procedure...