either excessive wear or wrong machining on the
crankcase.
- Check the diameters of both the bearings of the
crankshaft in accordance with the axes and surfa-
ces shown in the figure. The half-shafts are clas-
sified in two categories Cat. 1 and Cat. 2 as shown
the chart below.
CAUTION
THE CRANKSHAFT CAN BE REUSED WHEN
THE WIDTH IS WITHIN THE STANDARD VAL-
UES AND THE SURFACES SHOW NO SIGNS
OF SCORING.
CAUTION
WHILE OPENING THE CRANKCASES AND RE-
MOVING THE DRIVING SHAFT, CHECK THAT
THE THREADED SHAFT ENDS DO NOT INTER-
FERE WITH THE MAIN BUSHINGS. FAILURE
TO OBSERVE THIS PRECAUTION CAN DAM-
AGE THE MAIN BUSHINGS.
CAUTION
KEEP THE CRANKSHAFT IN ONE OF THE TWO
HALVES OF THE CRANKCASE WHEN SEPA-
RATING IT. IF YOU FAIL TO DO THIS, THE
CRANKSHAFT MIGHT ACCIDENTALLY FALL.
N.B.
WHEN MEASURING THE WIDTH OF THE
CRANKSHAFT, MAKE SURE THAT THE MEAS-
UREMENTS ARE NOT MODIFIED BY THE RAD-
IUSES OF FITTINGS WITH THE CRANKSHAFT
BEARINGS.
Specific tooling
020262Y
Crankcase splitting strip
020335Y
Magnetic support for dial gauge
Characteristic
Axial crankshaft/crankcase clearance: Stand-
ard clearance
0.15 - 0.40 mm (when cold)
Axial connecting rod - crankshaft clearance
Standard clearance
0.20 ÷ 0.50 mm
Radial connecting rod - crankshaft clearance
Standard clearance
0.036 ÷ 0.054 mm
Width of crankshaft with integral washers:
standard measurements
55.67 ÷ 55.85 mm
Engine
Vespa GTV 250 i.e.
ENG - 50
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 ...