APRILIA 8140172, Service And Repair Manual

Page: 182 / 279

ENGINE
RSV mille
3 - 99
3.7.11 ADJUSTING VALVE CLEARANCE
Carefully read 0.2.1 (PRECAUTIONS AND GENERAL
INFORMATIONS).
a
CAUTION
Check and, where necessary, adjust the valve clear-
ance:
– at periodic intervals, see 2.1.1 (REGULAR SERV-
ICE INTERVALS CHART);
– every time the timing drive assembly is repaired or
taken apart.;
– every time the head or camshaft is taken apart.
The valve clearance adjustment must be performed
with the engine at room temperature.
NOTE
The size is stamped on the adjustment shim.
Insert the adjustment shims with the writing facing down.
Before fitting them, always measure the adjustment
shims with a micrometer.
◆ Insert the adjustment shims (1) in the valve spring
housings (2).
◆
Oil the external diameter of the four valve lifter buckets
(3) and insert them in the head.
◆ Oil the four camshaft bushes (4) inside the head.
◆
Fit the exhaust camshaft (5) and intake camshaft (6)
with the cam lobe facing up.
NOTE
Difference on exhaust and intake camshafts:
– up to engine # 524 388, the exhaust camshaft features
a double shoulder (7);
– as of engine # 524 389, the intake camshaft features a
distinguishing groove (R).
◆ Insert the camshaft by hand and measure the valve
clearance with a feeler gauge.
◆ Make a note of the value of the valve clearance meas-
ured.
◆
Measure the difference between the desired value and
the actual value.
Valve clearance:
– intake valve 0.12 - 0.17 mm;
– exhaust valve 0.23 - 0.28 mm.
◆ Where necessary, replace the adjustment shim (1).
a
CAUTION
– Intake valve: the 0.15 mm gauge must be inserted
whilst the 0.20 mm one does not need to be insert-
ed.
– Exhaust valve: the 0.25 mm gauge must be insert-
ed whilst the 0.30 mm one does not need to be in-
serted.
M = MOLYKOTE
®
G-N.
O = Motor oil.