Inspecting the valve sealings
- Insert the valves into the cylinder head.
- Alternatively check the intake and exhaust
valves.
- The test is carried out by filling the manifold with
petrol and checking that the head does not ooze
through the valves when these are just pressed
with the fingers.
Inspecting the valve housings
- Check the width of the imprint on the valve
seat«
V
» wear limit max. 1.6 mm.
- Remove any carbon formation from the valve
guides.
- Measure the inside diameter of each valve guide.
- Take the measurement at three different heights
in the rocker arm push direction.
- If the width of the impression on the valve seat or
the diameter of the valve guide exceed the speci-
fied limits, replace the cylinder head.
Characteristic
Valve seat wear Intake guide
limit accepted: 5.022
Valve seat wear Intake guide
Standard diameter: 5.000 ÷ 5.012 mm
Valve seat wear Exhaust guide
Accepted limit 5.022
Valve seat wear Exhaust guide
Standard diameter: 5.000 ÷ 5.012 mm
Engine
Vespa GTV 250 i.e.
ENG - 40
Summary of Contents for 633844 IT
Page 4: ......
Page 6: ......
Page 7: ...INDEX OF TOPICS CHARACTERISTICS CHAR ...
Page 21: ...INDEX OF TOPICS TOOLING TOOL ...
Page 34: ...Tooling Vespa GTV 250 i e TOOL 14 ...
Page 35: ...INDEX OF TOPICS MAINTENANCE MAIN ...
Page 48: ...Maintenance Vespa GTV 250 i e MAIN 14 ...
Page 49: ...INDEX OF TOPICS TROUBLESHOOTING TROUBL ...
Page 53: ...INDEX OF TOPICS ELECTRICAL SYSTEM ELE SYS ...
Page 86: ...Electrical system Vespa GTV 250 i e ELE SYS 34 ...
Page 87: ...INDEX OF TOPICS ENGINE FROM VEHICLE ENG VE ...
Page 94: ...Engine from vehicle Vespa GTV 250 i e ENG VE 8 ...
Page 95: ...INDEX OF TOPICS ENGINE ENG ...
Page 152: ...Conceptual diagrams LUBRICATION CIRCUIT Engine Vespa GTV 250 i e ENG 58 ...
Page 153: ...Vespa GTV 250 i e Engine ENG 59 ...
Page 161: ...INDEX OF TOPICS INJECTION INJEC ...
Page 178: ... REMOTE CONTROLS CONTROL UNIT FUSES ETC Injection Vespa GTV 250 i e INJEC 18 ...
Page 182: ...Remove the filter from the pump support Injection Vespa GTV 250 i e INJEC 22 ...
Page 194: ...Injection Vespa GTV 250 i e INJEC 34 ...
Page 203: ...SIGNAL CONTROL Vespa GTV 250 i e Injection INJEC 43 ...
Page 206: ...Injection Vespa GTV 250 i e INJEC 46 ...
Page 207: ...INDEX OF TOPICS SUSPENSIONS SUSP ...
Page 228: ...Suspensions Vespa GTV 250 i e SUSP 22 ...
Page 229: ...INDEX OF TOPICS BRAKING SYSTEM BRAK SYS ...
Page 245: ...INDEX OF TOPICS COOLING SYSTEM COOL SYS ...
Page 248: ...Cooling system Vespa GTV 250 i e COOL SYS 4 ...
Page 249: ...INDEX OF TOPICS CHASSIS CHAS ...
Page 262: ...Chassis Vespa GTV 250 i e CHAS 14 ...
Page 263: ...INDEX OF TOPICS PRE DELIVERY PRE DE ...
Page 267: ...INDEX OF TOPICS TIME TIME ...