4-14 ENGINE TOP END
Camshaft, Camshaft Chain
Engage the camshaft chain with the camshaft sprockets.
Pull the tension side [A] (inlet side) of the chain taut to
install the chain.
The timing marks [B] on the inlet sprocket [C] must be
aligned with the cylinder head upper surface [D].
Pull the chain taut and fit it onto the camshaft sprocket.
Starting with the punch mark [E] on the top of the inlet
sprocket, count to the 24th pin. Feed the inlet camshaft
through the chain and align the 24th pin with the punch
mark [F] on the exhaust camshaft sprocket [G].
Be sure to install the knock pins.
Install the camshaft caps and top chain guide in the cor-
rect locations as shown. Location alphabets are marked
on the cylinder head and each cap.
The camshaft caps are machined with the cylinder
head. So, if a cap is installed in a wrong location,
the camshaft may seize because of improper oil
clearance in the bearings.
First tighten down the two camshaft cap bolts (#1 and #2
bolts in the figure) evenly to seat the camshafts in place,
then tighten all bolts following the specified tightening se-
Torque - Camshaft Cap Bolts: 12 N·m (1.2 kgf·m, 104 in·lb)
Install the head oil pipes.
Torque - Oil Pipe Bolts: 11 N·m (1.1 kgf·m, 95 in·lb)
Install the cam chain tensioner (see Cam Tensioner In-
Check the chain timing.
Camshaft and Sprocket Assembly
The inlet and exhaust sprockets are identical.
Install the sprockets so that the marked [A] ("IN" and "EX")
side faces to the left side.
Inlet sprocket must use "l" marked bolt holes.
Exhaust sprocket must use "E" marked bolt holes.
Apply a non-permanent locking agent to the camshaft
sprocket bolts and tighten them.
Torque - Camshaft Sprocket Bolts: 15 N·m (1.5 kgf·m, 11
If a new camshaft is to be used, apply a thin coat of a
molybdenum disulfide grease to the cam surfaces.