Download ENGINE MECHANICAL

CYLINDER HEAD
[KA24DE]
VALVE SEATS
A
Check valve seats for pitting at contact surface. Resurface or
replace if excessively worn.
●
Before repairing the valve seats, check the valves and valve
guides for wear as shown. If they are worn, replace them. Then
resurface the valve seat as necessary.
EM
C
SBIA0322E
●
Use both hands to resurface the valve seat uniformly using a
suitable tool, as shown.
D
E
F
G
SEM302D
H
REPLACING VALVE SEAT
1.
Bore out the old seat until it collapses. Boring should not continue beyond the bottom face of the seat recess in the cylinder
head. Set the machine depth stop to prevent damage.
I
J
K
SEM795A
2.
L
Ream the cylinder head valve seat recess.
Reaming bore for service valve seat
Oversize
: 0.5 mm (0.020 in)
Intake
: 38.000 - 38.016 mm (1.4961 - 1.4967 in)
Exhaust
: 32.700 - 32.716 mm (1.2874 - 1.2880 in)
3.
M
CAUTION:
Use the valve guide center for a reference point for reaming so the valve and valve seat will have
the correct fit.
Heat the cylinder head to 120° - 140°C (248° - 284°F) in heated
oil.
SEM008A
EM-39