Inspecting the by-pass valve
- Check the unloaded spring length.
- Check that the small piston is not scored.
- Ensure that it slides freely on the crankcase and
that it guarantees a good seal.
- If not, eliminate any impurities or replace defec-
tive parts.
Characteristic
By-pass check up: Standard length
54.2 mm
Refitting the oil sump
- Refit the by-pass valve plunger in its housing.
- Insert the pressure-regulating spring.
- Fit a new sump seal.
- Refit the two centring dowels.
- Refit the sump, taking care to locate the spring in
the appropriate recess machined into the inside of
the sump.
- Refit the rear brake cable brackets and the
screws in the reverse order from which they were
removed.
- Tighten the screws to the prescribed torque.
- Refit the driving pulley assembly, the drive belt,
the sprocket wheel and the transmission cover, as
described in the "Transmissions" chapter.
- When testing the lubrication system, refer to
chapter "Crankcase and Crankshaft", regard-
ing lubrication of the crankshaft and connect-
ing rod
Locking torques (N*m)
Oil sump screws
10 ÷ 14
Engine
Vespa GTV 250 i.e.
ENG - 66
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 ...