Derbi Rambla 250 Manual page 127

Engine
THE CRANKSHAFT CAN BE REUSED WHEN ITS WIDTH IS
WITHIN THE STANDARD VALUES AND THE SURFACES
SHOW NO SIGNS OF SCORING.
CAUTION
WHEN OPENING THE CRANKCASES AND REMOVING
THE CRANKSHAFT, CHECK THAT THE THREADED
SHAFT ENDS DO NOT INTERFERE WITH THE MAIN BUSH-
INGS. FAILURE TO OBSERVE THIS PRECAUTION CAN
DAMAGE THE MAIN BUSHINGS.
CAUTION
WHEN SEPARATING THE CRANKCASE KEEP THE
CRANKSHAFT IN ONE OF THE CRANKCASE HALF. THE
CRANKSHAFT MIGHT ACCIDENTALLY FALL IF THIS
RULE IS NOT OBSERVED.
NOTE
WHEN MEASURING THE CRANKSHAFT WIDTH, MAKE
SURE THAT THE MEASUREMENTS ARE NOT MODIFIED
BY THE COUPLING SPOKES WITH THE CRANKSHAFT
BEARINGS.
Characteristic
Crankshaft - crankcase axial clearance: Stand-
ard clearance
0.15 ÷ 0.40 mm (when cold)
Crankshaft - connecting rod axial clearance:
Standard clearance
0.20 ÷ 0.50 mm
Crankshaft - connecting rod radial clearance:
Standard clearance
0.036 ÷ 0.054 mm
Crankshaft width with integral washers: stand-
ard sizes
55.67 ÷ 55.85 mm
Camshaft bearings: Standard diameter: Cat. 1
28.994 ÷ 29.000
Camshaft bearings: Standard diameter: Cat. 2
29.000 ÷ 29.006
Specific tooling
AP8140922 Crankcase splitting strip
AP8140266 Comparator door
ENG - 127