45 / 948
KRYOTEC ENGINE
36
D. VALVES
1. Check valve leakages by pouring fuel on valve
head. Fuel must not seep past valve seat.
2. Valves with burnt heads, excessive scoring and
wear on stem should be replaced.
3. Check valve seat run out with respect to valve
stem. If it exceeds specified limit replace valve.
No attempt should be made to straighten bent
valves.
4. If valve is free from any other defects except
worn out seat, then only it can be rematch on
valve grinding machine as follows:
Clamp valve on grinding machine jaws as
close as possible to valve head.
Adjust grinding angle on graduated scale to
achieve correct valve seat angle.
Feed valve slowly towards grinding wheel
until wheel just touches valve head.
Grind at low feed until valve seat is just clean
all around.
NOTE
After machining the valve seat, remove the valve
from the grinding machine and check valve head
thickness. The minimum valve head thickness of
the valve is 0.85 mm.
VALVES
Measure
Value
Valve stem diameter- Intake (mm)
4.982 - 5.000
Valve stem diameter – Exhaust (mm)
4.972 - 4.990
VALVE SPRINGS
Measure
Value
Outer diameter-intake valve seats (mm)
29.600 - 29.611
Outer diameter-exhaust valve seats (mm)
26.100 - 26.111
Valve seat angle in contact with valve
45° 30' +/- 1°