S5 Workshop Manual
Engine
EM-46
6) Replacement of Valve Race
Clean the inner surface of valve seat ring hole.
Heat the cylinder head to about 250
℃
(480°F), and press and install a seat ring
into the hole of cylinder head.
Use grinding cream to grind valve and new seat.
Valve seat contacting width:
0.9
～
1.3 mm
7) Replace Valve Guide Pipe.
Use special tool (JACF116A) to remove old valve guide pipe along the bottom
direction of cylinder head.
Repair valve guide pipe hole, to make it match with new big size of valve guide
pipe.
Press valve guide pipe by special tool (JACF116B). It is necessary to press valve
guide pipe from the top of cylinder head. Attention should be paid that the length of
intake valve pipe and exhaust valve pipe is not the same.
Notes:
■ Do not install va
lve guide pipe with
original size.
Unless the size is enlarged.
After pressing and installing valve guide pipe, insert a new valve and inspect
whether the clearance between valve rod and guide pipe is suitable.
After replacing valve guide pipe, inspect whether the valve position is suitable. If
necessary, repair the valve seat.
EM075
EM074
Cylinder head
Valve guide
pipe
Intake
Exhaust
(1.811 inch)
2.146 inch)
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