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1.5L REVOTORQ ENGINE
62
E. VALVE SEATS
1.
Check valve seat height with respect to
cylinder head mating surface. Replace valve
seat inserts if they are worn out beyond
specified limit.
2.
Cut exhaust and inlet valve seats with a
general 45 deg. cutter.
NOTE
Valve seat must be absolutely faultless and without
any chatter marks
3.
If necessary lap the valve seats to a smooth
and even finish by using suitable hand pump
grinder or a lapping paste and valve itself.
4.
Smear valve seat with carbon blue. Install
valve in guide and turn it slowly under axial
pressure.
5.
Contact line on valve seat must be around
entire circumference at equal width.
6.
Distance between narrow diameters of valve
face to contact line should be minimum 0.5
mm.
7.
Check for leakages through valve seat by
pouring fuel on valve head. Fuel must not seep
past valve seat.
Valve seat Specifications
Dimensions
Intake Valve
Exhaust Valve
Valve Seat Angle 'H'
45° - 30’
45° - 30’
Valve seat Diameter in Cylinder head
24.6 mm
20.7 mm
Distance ‘F’ between Cylinder head mating
Surface with crank Case to Valve Seat in
Cylinder head
7 ± 0.1 mm
7 ± 0.1 mm
Maximum run out of Valve Seat in Cylinder
Head with Respect to Valve guide axis
0.035 mm
0.035 mm
Valve Seat Inner Bore Dia. in Cylinder
Head (mm)
Normal : 27.5
+0.021, -0.000
Normal : 23.4
+0.021, -0.000
Valve Seat Insert Outside Dia (mm)
Normal : 27.6
+.0.000/-0.013
Normal 1 : 27.8
+.0.000/-0.013
Normal : 23.5
+.0.000/-0.013
Normal 1 : 23.7
+.0.000/-0.013