S5 Workshop Manual
Engine
EM-18
4) Dismantling air filter.
5) Dismantling timing belt shield.
6) Dismantle rocker arm and crankshaft position sensor.
7) Loosen fixing bolt of camshaft chain wheel, and then dismantle camshaft chain
wheel.
8) Loosen camshaft bearing cover bolts, and remove bearing cover, camshaft, rocker
arm and hydraulic tappet.
Notes:
■ Gradually loosen cover bolts to avoid
bending camshaft.
3. Inspection
1) Rocker arm
Inspect the rotation of roller wheel. If it can't rotate smoothly or there is any
loosening, replace it.
Inspect the surface of roller wheel. If there is any depression or obvious scratch,
replace it.
Inspect whether valve contact surface has damage or obvious scratch. If necessary,
replace it.
2) Camshaft
Inspect whether camshaft journal has abrasion. If the journal has serious abrasion,
replace camshaft.
Inspect whether the tip point of cam has damage. If the tip point has damage, or
excessive abrasion, replace camshaft.
Cam Height
Standard Value
Air intake : 35.493 mm
Air exhaust : 35.204 mm
EM013
EM012
EM011
Roller wheel
Contact surface
Cam
height
Journal
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