Shared Left Border

 

 

CAMSHAFT
No. of bearings 3
Type of bearings (front, centre and rear) Steel back white metal
End thrust Location plate at front
Drive Duplex chain
Lubrication Oil jet
Chain tensioner Spring blade
End float .002 in. /.004 in.  (.05/.10 mm.)
Journal diameters (front, centre and rear) 1.7477 in. /1.7470 in. (44.392/44.374 mm.)
CRANKSHAFT (for torque loading figures see table at end of section)
Balance Integrally forged counterweights
No. of main bearings  3
Type of main bearings Steel shell white metal lined
Dia. of main journals 2.2495 in. /2.2490 in. (57.137/57.125 mm.)
Type of crankpin bearings Steel shell with copper-lead bearing, indium lined
Dia. of crankpin bearings (Series I Alpine, Series III Rapier) 1 .8760 in. /1.8755 in. (47.650/47.638 mm.)
Dia. of crankpin bearings (Alpine 11, Rapier III A onwards) 2.0010 in./2.0005 in. (50.825/50.812 mm.)
Lubrication Pressure
End thrust Thrust washer on centre bearing
End float .002 in. /.004 in. (.05/.10 mm.)
Main bearing running clearance .0010 in. /.0025 in. (on dia.) (.025/.063 mm.)
Max. undersize for re-grinding .06 in. (1.52 mm.)
Size of main bearing bolts 7/16 in. (11.1 mm.)
CONNECTING ROD (for torque loading figures see table at end of section)
Material Steel forging  
Type ' H ' section  
Distance between centres 5.751 in./5.749 in.  (146-3/146-25 mm.)
Small end bearings Bushed  
Big end bearings Steel shell with copper-lead bearing, indium coated
  Series I Alpine, Series III Rapier Series II, lll, IV Alpine, Series IIIA, IV Rapier
Big end bore (without bearings)   2.0215 in. /2.0210 in. (51.34/51.33 mm.) 2.1465 in./2.1460 in. (54.52/54.50 mm)
Small end bore size (bushed), graded:
High grade (painted white) .8753 /.8752 in. (22.233/22.230 mm.) .9379 /.9378 in. (23.822/23.820 mm)
Medium grade (painted green) .8752 /.8751 in. (22.230/22.228 mm.)  \.9378/.9377 in. (23.820/23.817 mm)
Low grade (painted yellow) .8751/.8750 in. (22.228/22.225 mm.)

.9377/.9376 in. (23.817/23.815 mm)
Size of big end bolts 5/16 in. U.N.F. 11/32 in. U.N.F.
Big end, end float .0012 in. /.0075 in. (.030/.190 mm.)
Big end bearing running clearance .0015 in. /.002 in. (.038/.051 mm.)
Lubrication Squirt hole in big end  
GUDGEON PIN
Type Tubular fully floating    
Diameter      
High grade (marked with white paint)  .8752 in. /.8751 in.  (22.230/22.228 mm.) Series I Alpine

Series III Rapier
Medium grade (marked with green paint) .8751 in. /.8750 in. (22.228122.225 mm.)
Low grade (marked with yellow paint) .8750 in./.8749 in. (22.225/22.223 mm.)
High grade (marked with white paint)  .9377 in./.9376 in. (23.817/23.815 mm.) Series II, III, IV Alpine

Series III A, IV Rapier
Medium grade (marked with green paint) .9376 in./.9375 in.  (23.815/23.812 mm.)
Low grade (marked with yellow paint) .9375 in./.9374 in. (23.812/23.810 mm.)
Oversize available.  .003 in./.076 mm    
Method of location Circlips