APRILIA RSV4 Factory a-PRC 2009 Service Station Manual page 311

RSV4 Factory a-PRC

Remove the intake and exhaust cam-

If the two camshafts are timed correctly, the ex-

haust camshaft gear tooth (indicated with a dot) is

meshed with the trough of the intake camshaft

gear (indicated with two dots).

Inspecting camshafts

CAMSHAFT TOOTHED WHEEL CHECK

Check that the camshaft gear works properly: if it is damaged or does not move smoothly,

replace the timing chain and the camshaft gear.

CAMSHAFT LOBES

Check that they do not show blue colouring, cracks or scratches; otherwise, replace the

camshaft, gear and chain.

Fasten the camshaft in horizontal po-

sition, as shown in the figure, and make

it spin to check the eccentricity with a

dial gauge; if necessary, replace the

Characteristic

Maximum camshaft axial clearance (intake/ex-

0.4 mm (0.0016 in)

THE EXHAUST CAMSHAFTS OF THE FRONT AND REAR CYLINDER BANKS MUST BOTH BE OF

THE SAME TYPE - EITHER WITH A CONVENTIONAL GEAR OR WITH A SELF-ADJUSTING CAM-

SHAFT GEAR. THE TWO TYPES OF CAMSHAFT ARE INTERCHANGEABLE ON ALL ENGINES

IRRESPECTIVE OF THE CAMSHAFT TYPE ORIGINALLY INSTALLED.