Inspecting The Cylinder Head - APRILIA Atlantic 300 Service Station Manual

Engine
AP8140921 Oil seal punch
AP8140660 Piston fitting ring

Inspecting the cylinder head

NOTE
TO MEASURE WEAR LIMITS AND COUPLING CLEARANCES, SEE THE SPECIFICATIONS CHAP-
TER.
See also
Cylinder head
Inspecting the timing system components
- Check that the guide slider and the tensioner pad
are not excessively worn.
- Check that the chain assembly, the camshaft
driving pulley and the sprocket wheel are not worn.
- If sings of wear are found, replace the parts; if the
chain, pinion or pulley are worn, replace the whole
assembly.
- Remove the central screw with the washer and
the tensioner spring. -Check that the one-way
mechanism is not worn.
- Check the condition of the tensioner spring.
- If signs of wear are found, replace the whole as-
sembly.
Inspecting the valve sealings
- Fit the valves into the cylinder head.
- Alternatively test the intake and exhaust valves.
- This test should be carried out by filling the mani-
fold with petrol and checking that the head does
not excessively ooze through the valves.
ENG - 132
ATLANTIC 300 i.e.