- Calculate the clearance between valve and valve guide.
- Check that there are no signs of wear on the surface of contact with the articulated register terminal.
- If the checks above give no failures, you can use the same valves. For best sealing results, it is
advisable to grind the valves. Grind the valves gently with a fine-grained lapping compound. During the
grinding, keep the cylinder head with the valve axes in a horizontal position. This will prevent the lapping
compound residues from penetrating between the valve stem and the guide (see figure).
CAUTION
TO AVOID SCORING THE FAYING SURFACE, DO NOT KEEP ROTATING THE VALVE WHEN NO
LAPPING COMPOUND IS LEFT. CAREFULLY WASH THE CYLINDER HEAD AND THE VALVES
WITH A SUITABLE PRODUCT FOR THE TYPE OF LAPPING COMPOUND BEING USED.
N.B.
DO NOT CHANGE THE POSITIONS THE VALVES ARE FITTED IN
Characteristic
Valve check standard length
Outlet: 94.4 mm
Valve check standard length
Inlet: 94.6 mm
Valve check Maximum admissible clearance
Outlet: 0.072 mm
Valve check Maximum admissible clearance
Inlet: 0.062 mm
Valve check standard clearance
Outlet: 0.025 ÷ 0.052 mm
Valve check standard clearance
Inlet: 0.013 ÷ 0.040 mm
Valve check Minimum admissible diameter
Outlet: 4.95 mm
Valve check Minimum admissible diameter
Inlet: 4.96 mm
Valve check Standard diameter:
Inlet: 4.972 ÷ 4.987 mm
Valve check Standard diameter:
Outlet: 4.96 ÷ 4.975 mm
MSS X9 Evolution 250
Engine
ENG - 121
Summary of Contents for MSS X9 EVOLUTION 250
Page 1: ...WORKSHOP MANUAL 618153 MSS X9 Evolution 250 ...
Page 4: ......
Page 6: ...INDEX OF TOPICS CHARACTERISTICS CHAR ...
Page 19: ...INDEX OF TOPICS TOOLING TOOL ...
Page 31: ...INDEX OF TOPICS MAINTENANCE MAIN ...
Page 46: ...INDEX OF TOPICS TROUBLESHOOTING TROUBL ...
Page 52: ...INDEX OF TOPICS ELECTRICAL SYSTEM ELE SYS ...
Page 77: ...INDEX OF TOPICS ENGINE FROM VEHICLE ENG VE ...
Page 80: ...INDEX OF TOPICS ENGINE ENG ...
Page 116: ...Engine MSS X9 Evolution 250 ENG 116 ...
Page 148: ... Remove the maximum nozzle Remove diffuser Engine MSS X9 Evolution 250 ENG 148 ...
Page 172: ...INDEX OF TOPICS SUSPENSIONS SUSP ...
Page 181: ...stand retaining bolt 20 25 MSS X9 Evolution 250 Suspensions SUSP 181 ...
Page 182: ...INDEX OF TOPICS BRAKING SYSTEM BRAK SYS ...
Page 191: ...MSS X9 Evolution 250 Braking system BRAK SYS 191 ...
Page 192: ...INDEX OF TOPICS COOLING SYSTEM COOL SYS ...
Page 193: ...Circuit diagram MSS X9 Evolution 250 Cooling system COOL SYS 193 ...
Page 203: ...Thermostat cover screws 3 4 MSS X9 Evolution 250 Cooling system COOL SYS 203 ...
Page 204: ...INDEX OF TOPICS CHASSIS CHAS ...
Page 215: ...INDEX OF TOPICS PRE DELIVERY PRE DE ...
Page 219: ...INDEX OF TOPICS TIME TIME ...