A
B
C
D
E
F
G
H
L
M
N
P
section
N 4.5
86 1098/1098S - M.Y. 2007 - edition 00
Engine
Heat the cylinder head gradually and evenly up to 150 °C and chill the new valve seats in dry ice.
Drive the seats perfectly square into the head bores using the appropriate valve guide seat installer 88713.2846 and 88713.2847.
Allow the cylinder head to cool down and grind the seats to the following dimensions:
CA = Ø41.6± 0.025 mm
CS = Ø33.6± 0.025 mm
S = 1.2 mm
D = 0.2 to 0.4 mm
Important
Do not use any lapping compound after final grinding.
It is advisable to smooth the joint between the intake valves seats and the intake ducts (F = before; G = after).
S
D
S
D
CS
CA
A
B
A
5:1
B
5:1
F
G
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