APRILIA 8140172, Service And Repair Manual

Page: 160 / 279

ENGINE
RSV mille
3 - 77
3.6.30 CYLINDER
Carefully read 0.2.1 (PRECAUTIONS AND GENERAL
INFORMATIONS).
◆ All the gasket surfaces must be cleaned and flat. Flat-
ness of the gasket surfaces:
Max. permissible distortion: 0.04 mm.
◆ Make sure all the threads are in a perfect state of re-
pair.
◆ Examine the sliding surface of the cylinder to check for
any friction and scratches, and check whether the gas-
ket surfaces feature signs of damage.
NOTE
If there are evident grooves on the nikasil lining
inside the cylinder, replace the cylinder complete with pis-
ton.
◆ Clean the cylinders cooling cavity of any lime scale.
◆ Measure the bore of the cylinder in 3 places at a dis-
tance of 45 mm from the upper edge (1); consider the
highest value for the wear limit.
– Cylinder “A” dimension when new:
bore Ø 97.000 - 97.012 mm.
wear limit: max. Ø 97.027 mm.
– Cylinder “B” dimension when new:
bore Ø 97.012 - 97.025 mm.
wear limit: max. Ø 97.040 mm.
NOTE
The size group “A” or “B” is punched onto the
lower side of the cylinder (2).
NOTE
In order to assess the wear limit, the assembly
play must be determined, see 3.6.31 (PISTON AND
GUDGEON PIN).
◆ Make sure the chain tightener (3) and the guide in the
cylinder are in a perfect state of repair.
Chain tightener (3) / hole on the cylinder clearance (4):
wear limit (hole diameter - chain tightener diame-
ter): max. 0.08 mm;
Hole for chain tightener in the cylinder:
wear limit (4): max. Ø 14.07 mm.