Gilera 633721 Workshop Manual page 16

Characteristics
AXIAL CLEARANCE BETWEEN CRANKSHAFT AND CONNECTING ROD
Name
Transmission-side
shoulder
Transmission-side half-
shaft
Connecting rod
Flywheel-side shoulder
Flywheel-side half-shaft
Complete drive shaft
Characteristic
Drive shaft / crankcase axial clearance:
0.1 - 0.5 mm (when cold)
Slot packing system
Shimming system for limiting the compression ra-
tio Rc = 10.5 : 1
DISTANCE «A» IS A PROTRUSION OR RE-
CESS VALUE OF THE PISTON CROWN WITH
RESPECT TO THE CYLINDER PLANE.
DISTANCE «A» HELPS DETERMINE THE
THICKNESS OF GASKET «B» THAT HAS TO
BE FITTED TO THE CYLINDER HEAD IN OR-
DER TO RESTORE COMPRESSION RATIO.
BASE GASKET «B» MUST BE THICKER THE
MORE THE PLANE FORMED BY THE PISTON
TOP PROTRUDES FROM THE PLANE
FORMED BY THE CYLINDER HEAD. ON THE
OTHER HAND, THE MORE THE PISTON TOP IS
RECESSED INTO THE CYLINDER TOP PLANE,
THE SMALLER THE GASKET THICKNESS.
Name
«A» MEASURE TAKEN
«A» MEASURE TAKEN
«A» MEASURE TAKEN
N.B.
VALUES INDICATED WITH «-» REFER TO PISTON CROWN RECESSES WITH RESPECT TO THE
CYLINDER PLANE.
CHAR - 16
Description Dimensions
0.8 ± 0.025
19.6 + 0.050
22 0.10-0.15
13 ± 0.025
19.6 +0.050
63.5+0.1-0.05
BASE GASKET THICKNESS
Measure A
- 0.185 - - 0.10
- 0.10 - + 0.10
+ 0.10 ÷ + 0.185
Nexus 500 euro 3
Initials Quantity
A D= 0.20 - 0.40
B D= 0.20 - 0.40
C D= 0.20 - 0.40
F D= 0.20 - 0.40
E D= 0.20 - 0.40
G D= 0.20 - 0.40
Thickness
0.4 ± 0.05
0.6 ± 0.05
0.8 ± 0.05