ENGINE
RSV mille
3
- 74
3.6.29 VALVES
Carefully read 0.2.1 (PRECAUTIONS AND GENERAL
INFORMATIONS).
a
CAUTION
The seat (1) on the head of the valve is reinforced by
means of inductive hardening.
For this reason, the seat cannot be reground and, in-
stead, the valve must be replaced.
Grinding with abrasive paste is nonetheless permit-
ted, whilst it is prohibited to regrind a valve at the end
on the valve stem.
◆
Clean the valves of all residual combustion products.
◆
Check the seat (1) on the valve head with a line.
The surface of the seat must not be concave; where
necessary, replace it.
◆
Check the diameter of the stem with a micrometer:
– intake valve:
wear limit (2) min. Ø 5.950 mm;
– exhaust valve:
wear limit (2) min. Ø 5.935 mm.
◆
Check the eccentricity of the valve:
– valve stem:
permissible eccentricity (3) max. 0.05 mm;
– valve head:
permissible eccentricity (4) max. 0.05 mm.
◆
Check whether the fastening grooves (5) of the valve
cotters are in a perfect state of repair.
VALVE SPRINGS
◆
Measure and visually inspect the valve springs to check
for breakage, distortion or loss of tension; measure the
length of the springs in the release position.
– Valve springs:
wear limit (6) min. 43.4 mm;
– Valve springs:
wear limit (7) min. 40.9 mm.
NOTE
Worn spring valves may result in a reduction in
engine power and increased noise from the valve assem-
bly.
Summary of Contents for 8140172
Page 1: ...RSV mille MIN 956X Service and repair manual aprilia part 8140172 ...
Page 5: ...0 4 RSV mille NOTE ...
Page 6: ...1 1 RSV mille GENERAL INFORMATION 1 ...
Page 28: ...2 1 RSV mille 1 SERVICE AND SETTING UP 2 ...
Page 84: ...3 1 RSV mille 1 3 ENGINE 3 ...
Page 200: ...4 1 RSV mille 1 2 3 FUEL SUPPLY SYSTEM 4 ...
Page 226: ...5 1 RSV mille 1 2 3 4 COOLING SYSTEM 5 ...
Page 236: ...6 1 RSV mille 6 6 6 6 6 ELECTRICAL SYSTEM 6 ...
Page 239: ...6 4 ELECTRICAL SYSTEM RSV mille 42 0 43 9 54 ...