Yamaha Fz6n Manual
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Page 231
5-11 CAMSHAFTSENG NOTE: CAUTION: EAS00198 REMOVING THE CAMSHAFTS 1. Remove: pickup rotor cover Refer to “CRANKSHAFT POSITION SEN- SOR AND PICKUP ROTOR”. 2. Align: “T” mark a on the pickup rotor (with the crankcase mating surface b) a. Turn the crankshaft clockwise. b. When piston #1 is at TDC on the compres- sion stroke, align the “T” mark a on the pick- up rotor with the crankcase mating surface b. TDC on the compression stroke can be found when the camshaft lobes are turned away from each other....
Page 232
5-12 CAMSHAFTSENG NOTE: 7. Remove: intake camshaft 1 exhaust camshaft 2 To prevent the timing chain from falling into the crankcase, fasten it with a wire a. 8. Remove: camshaft sprockets EAS00204 CHECKING THE CAMSHAFTS 1. Check: camshaft lobes Blue discoloration / pitting / scratches Re- place the camshaft. 2. Measure: camshaft lobe dimensions a and b Out of specification Replace the cam- shaft. Camshaft lobe dimension limit Intake camshaft a 32.45 32.55 mm (1.278 1.282 in) : 32.40 mm...
Page 233
5-13 CAMSHAFTSENG NOTE: 3. Measure: camshaft runout Out of specification Replace. Camshaft runout limit 0.06 mm (0.0024 in) 4. Measure: camshaft-journal-to-camshaft-cap clear- ance Out of specification Measure the camshaft journal diameter. Camshaft-journal-to-camshaft- cap clearance 0.028 0.062 mm (0.0011 0.0024 in) : 0.08 mm (0.0032 in) a. Install the camshaft into the cylinder head (without the dowel pins and camshaft caps). b. Position strip of Plastigauge 1 onto the camshaft journal as...
Page 234
5-14 CAMSHAFTSENG NOTE: EAS00208 CHECKING THE TIMING CHAIN, CAMSHAFT SPROCKETS, AND TIMING CHAIN GUIDES The following procedure applies to all of the camshaft sprockets and timing chain guides. 1. Check: timing chain 1 Damage / stiffness Replace the timing chain and camshaft sprockets as a set. 2. Check: camshaft sprocket More than 1 / 4 tooth wear a Replace the camshaft sprockets and the timing chain as a set. a1 / 4 tooth bCorrect 1Timing chain roller 2Camshaft sprocket 3. Check: timing chain...
Page 235
5-15 CAMSHAFTSENG NOTE: b. Remove the screwdriver and slowly release the timing chain tensioner rod. c. Make sure that the timing chain tensioner rod comes out of the timing chain tensioner housing smoothly. If there is rough move- ment, replace the timing chain tensioner. 3. Check: cap bolt aluminum washer New gasket New Damage / wear Replace the defective part(s). EAS00215 INSTALLING THE CAMSHAFTS 1. Align: “T” mark a on the pickup rotor (with the crankcase mating surface b) a. Turn the...
Page 236
5-16 CAMSHAFTSENG NOTE: 10 Nm (1.0 mkg, 7.2 ftlb) NOTE: CAUTION: NOTE: 3. Install: dowel pins exhaust camshaft caps intake camshaft caps Make sure each camshaft cap is installed in its original place. Make sure the arrow mark a on each cam- shaft cap points towards the right side of the engine. 4. Install: camshaft cap bolts Tighten the camshaft cap bolts in stages and in a crisscross pattern, working from the inner caps out. I1, I2: Intake side camshaft cap mark E1, E2: Exhaust side camshaft...
Page 237
5-17 CAMSHAFTSENG WARNING 20 Nm (2.0 mkg, 15 ftlb) CAUTION: 6. Install: timing chain tensioner a. While lightly pressing the timing chain ten- sioner rod by hand, turn the tensioner rod ful- ly clockwise with a thin screwdriver 1. b. With the timing chain tensioner rod turned all the way into the timing chain tensioner hous- ing (with the thin screwdriver still installed), install the gasket and the timing chain ten- sioner 2 onto the cylinder block. Always use a new gasket. c. Tighten the timing...
Page 238
5-18 CAMSHAFTSENG 10. Measure: valve clearance Out of specification Adjust. Refer to “ADJUSTING THE VALVE CLEAR- ANCE” in chapter 3.
Page 239
5-19 Order Job / Part Q’ty Remarks 1 2 3Removing the cylinder head Intake and exhaust camshaft Engine bracket Cylinder head Cylinder head gasket Dowel pin1 1 2Remove the parts in the order listed. Refer to “CAMSHAFTS”. Refer to “ENGINE”. For installation, reverse the removal procedure. 12 Nm (1.2 mkg, 8.7 ftlb) 19 Nm (1.9 mkg, 14 ftlb) 50 Nm (5.0 mkg, 36 ftlb) 1st 2nd CYLINDER HEADENG EAS00221 CYLINDER HEAD
Page 240
5-20 CYLINDER HEADENG NOTE: NOTE: NOTE: EAS00222 REMOVING THE CYLINDER HEAD 1. Remove: cylinder head bolts Loosen the bolts in the proper sequence as shown. Loosen each bolt 1 / 2 of a turn at a time. After all of the bolts are fully loosened, remove them. EAS00229 CHECKING THE CYLINDER HEAD 1. Eliminate: combustion chamber carbon deposits (with a rounded scraper) Do not use a sharp instrument to avoid damag- ing or scratching: spark plug bore threads valve seats 2. Check: cylinder head Damage /...