Service Manual

5-8 ENGINE TOP END
Cylinder Head
Push Rod Inspection
•
Place the rocker arm push rod in V blocks that are as far apart as
possible, and set a dial gauge on the rod at a point halfway between
the blocks. Turn the rod to measure the runout. The difference
between highest and the lowest dial readings is the amount of runout.
If the runout exceeds the service limit, replace the rod.
Rocker Arm Push Rod Runout
Service Limit: 0.5 mm (0.02 in.)
Valve Mechanism Removal/Installation
•
Remove the cylinder head assembly (see Cylinder Head Assembly
Removal).
NOTE

When removing the valve mechanism parts, note their position
so that they may be reinstalled in their original position during
assembly.
•
Remove:
Valve Clearance Adjusting Nuts [A]
Rocker Arms [B]
•
Support the valve head in the combustion chamber with a suitable
block.
•
To remove the collets [A], push down the valve retainer [B] with
thumbs and remove the Collets.
•
Remove the spring [C] and valve [D] .
•
Remove the stem seals [A].
NOTE

It is not necessary to remove the stem seal unless it is being
replaced.

Valve guide [B] is not replaceable, do no remove it.
•
Valve Installation.

Apply engine oil to the valve stem to avoid damaging the stem seal.

Check to see that the valve moves smoothly up and down in the
guide.

Check the valve seating surface [A] between the valve [B] and valve
seat [C].
•
Rocker Arm Installation

Soak the valve clearance adjusting nuts and rocker arm in the engine
oil.

Install the rocker arm.