Valve Clearance - Subaru 2009 IMPREZA Service Manual

MECHANICAL

8. Valve Clearance

A: INSPECTION
CAUTION:
If engine oil is spilt onto the exhaust pipe, wipe
it off with cloth to avoid emission of smoke or
causing a fire.
NOTE:
Inspection and adjustment of valve clearance
should be performed while engine is cold.
1) Set the vehicle on a lift.
2) Lift up the vehicle.
3) Remove the under cover.
4) Lower the vehicle.
5) Disconnect the ground cable from battery.
6) Remove the timing belt cover LH.
7) Remove the fuel injector. <Ref. to FU(H4SO)-
36, REMOVAL, Fuel Injector.>
8) When inspecting #1 and #3 cylinders
(1) Disconnect the spark plug cords from spark
plugs on RH side. <Ref. to IG(H4SO)-4, RH
SIDE, REMOVAL, Spark Plug.>
(2) Place a suitable container under the vehicle.
(3) Disconnect the PCV hose from the rocker
cover RH.
(4) Remove the bolts, then remove the rocker
cover RH.
Valve Clearance
9) When inspecting #2 and #4 cylinders
(1) Disconnect the spark plug cords from spark
plugs on LH side. <Ref. to IG(H4SO)-4, LH
SIDE, REMOVAL, Spark Plug.>
(2) Place a suitable container under the vehicle.
(3) Disconnect the PCV hose from the rocker
cover LH.
(4) Remove the bolts, then remove the rocker
cover LH.
10) Set #1 cylinder piston to top dead center of
compression stroke by rotating the crank pulley
clockwise using the socket wrench.
NOTE:
When the arrow mark (A) on cam sprocket LH is at
the top position, the #1 cylinder piston is at top
dead center of the compression stroke.
IN-00203
11) Measure #1 cylinder valve clearance by using
thickness gauge (A).
NOTE:
• Insert the thickness gauge (A) in as horizontally
as possible with respect to the valve stem end face.
• Lift up the vehicle, and then measure the ex-
haust valve clearances.
Valve clearance (inspection value):
Intake
0.20 0.04 mm (0.0079 0.0016 in)
ME-00199
Exhaust
0.25 0.04 mm (0.0098 0.0016 in)
ME(H4SO)-28
( A )
ME-00200
(A)
ME-02696