2-30 PERIODIC MAINTENANCE
Periodic Maintenance Procedures
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 molybdenum disulfide oil solution to the valve lifter
surface and install the lifter.
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).
Air Suction System Damage Inspection
Disconnect the air switching valve hose [A] from the lower
air cleaner housing [B] (see Air Cleaner Housing Removal
in the Fuel System (DFI) chapter).
Connect the following parts temporarily.
Fuel Pump Lead Connector [A]
Extension Tube [B]
Air Cleaner Housing (see Air Cleaner Housing Installa-
tion in the Fuel System (DFI) chapter)
Special Tool - Extension Tube: 57001-1578