4-20 ENGINE TOP END
Install a new cylinder head gasket with "UP" [A] marked
side positioning to the right.
The camshaft caps are machined with the cylinder head
so if a new cylinder head is installed, use the caps that
are supplied with the new head.
Tighten the 10 mm cylinder head bolts following the tight-
ening sequence. Tighten them first to about one half of
the specified torque.
Torque - Cylinder Head Bolts 10 mm: 51 N·m (5.2 kgf·m, 38
Cylinder Head Bolts 6 mm: 9.8 N·m (1.0 kgf·m, 87
Tighten the 6 mm cylinder bolts.
Install the camshafts, camshaft caps and top chain guide.
Install the head oil pipes.
Cylinder Head Warp Inspection
Clean the cylinder head (see Cylinder Head Cleaning).
Lay a straightedge [A] across the lower surface of the
head at several different points, and measure warp by
inserting a thickness gauge [B] between the straightedge
and the head.
If warp exceeds the service limit, repair the mating sur-
face. Replace the cylinder head if the mating surface is
Cylinder Head Warp
Cylinder Head Cleaning
Remove the cylinder head (see Cylinder Head Removal).
Remove the valves (see Valve Removal).
Wash the head with a high-flash point solvent.
Scrape [A] the carbon out of the combustion chamber and
exhaust port with a suitable tool.
0.05 mm (0.002 in.)