Yamaha YZF-R1 2012, Service Manual

Page: 272 / 556

CAMSHAFTS
5-21
6. Install:
• Exhaust camshaft “1”
• Intake camshafts “2”
TIP
• Hang the timing chain on the sprocket from
the exhaust camshaft to the intake camshaft,
and then put it on the cylinder head.
• The intake camshaft sprocket timing mark “a”
and exhaust camshaft sprocket timing mark
“b” should align with the cylinder head sur-
face “c”.
• The timing chain (exhaust side) should be
stretched and the timing chain (intake side)
should be sagged.
7. Install:
• Intake camshaft caps
• Exhaust camshaft caps
TIP
• Make sure each camshaft cap is installed in
its original place. Refer to the identification
marks as follows:
“I”: Intake side camshaft cap mark
“E”: Exhaust side camshaft cap mark
“IL”: Intake left side camshaft cap mark
“IR”: Intake right side camshaft cap mark
“EL”: Exhaust left side camshaft cap mark
“ER”: Exhaust right side camshaft cap mark
• Make sure the arrow mark “a” on each cam-
shaft points towards the right side of the
engine.
• When installing the camshaft cap, face the
hole with the screw thread “b” on the cam-
shaft cap to the left side of the engine.
8. Install:
• Camshaft cap bolts
ECA14B1011
• Lubricate the camshaft cap bolts with the
engine oil.
• The camshaft cap bolts must be tightened
evenly or damage to the cylinder head,
camshaft caps, and camshafts will result.
• Do not turn the crankshaft when installing
the camshaft to avoid damage or
improper valve timing.
TIP
Tighten the camshaft cap bolts in stages and
in a crisscross pattern, working from the inner
caps out.
9. Install:
• Timing chain tensioner
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Using a hand press, push and insert timing
chain tensioner rod “1” into the timing chain
tensioner housing.
TIP
Push the timing chain tensioner rod in direction
“a”, and turn the timing chain tensioner body
“2” in direction “b” until it stops.
A. Right side
B. Left side
Camshaft cap bolt
10 Nm (1.0 m·kgf, 7.2 ft·lbf)