Periodic Maintenance Procedures
Valve Clearance Adjustment
To change the valve clearance, remove the camshaft
chain tensioner, camshafts and valve lifters. Replace the
shim with one of a different thickness.
Keep the valve lifters and shims so that they can be
reinstalled in their original positions.
Clean the shim to remove any dust or oil.
Measure the thickness of the removed shim [A].
Select a new shim thickness calculation as follows.
a + b – c = d
[a] Present Shim Thickness
[b] Measured Valve Clearance
[c] Specified Valve Clearance (Mean Value = 0.195 mm
(Exhaust), 0.185 mm (Intake))
[d] Replace Shim Thickness
1.600 + 0.28 – 0.195 = 1.685 mm
Exchange the shim for the 1.675 size shim.
Do not use the shims for another models. Use the
specified shim for this model surely.
Be sure to remeasure the clearance after selecting
a shim. The clearance can be out of the specified
range because of the shim tolerance.
If there is no valve clearance, use a shim that is a few
sizes smaller, and remeasure the valve clearance.
When installing the shim, face the marked side toward the
valve lifter. At this time, apply engine oil to the shim or
the valve lifter to keep the shim in place during camshaft
Do not put shim stock under the shim. This may
cause the shim to pop out at high rpm, causing ex-
tensive engine damage.
Do not grind the shim. This may cause it to fracture,
causing extensive engine damage.
Apply engine oil to the valve lifter surface and install the
Install the camshafts (see Camshaft Installation in the En-
gine Top End chapter).
Recheck the valve clearance and readjust if necessary.
Install the removed parts (see appropriate chapters).
PERIODIC MAINTENANCE 2-31