APRILIA SL Mille Workshop Manual page 297

REPAIR INFORMATION
Follow~
SL mille
power ip plugs dirty- or replace
Spark plugs are not to spec.
Replace
Insufficient valve clearance
Adjust (*)
Exhaust system faulty Replace
Valve timing incorrect Adjust (*)
Faulty valve springs
Replace (*)
Valve seats leaking Reface seat (*)
Intake coupling or intake system leaking Replace
Clutch slipping
Replace the clutch discs or
springs (*)
Motor oil not to spec.
Use motor oil conforming to
spec.
Air cleaner dirty
Replace
F dp Ip
t
Iity Replace
Replace the fuel pressure
Fuel pressure too low regulator or check the
pump
Injector dirty Replace
Piston rings worn
Replace (*)
See the subsections entitled [The engine produces an excessive amount of exhaust fumes
(blue smoke)] and (The clutch slips) for other possible causes
The engine overheats
Insufficient coolant in the cooling system, system leaking Top up with coolant, sub-
ject the system to a pres-
sure test
Coolant not to specification
Use coolant conforming to
specification
Radiator dirty or coolant pipe clogged Clean
Air in the cooling system
Bleed
Cooling fan motor faulty
Repair or replace
Coolant thermal switch faulty Replace
Thermal expansion valve faulty
Replace
Coolant pump or coolant pump control drive faulty Replace (*)
Insufficient oil in the system Top up with motor oil
Oil pump or oil pump control faulty, or oil circuit clogged
Replace or clean (*)
Motor oil not to spec.
Use motor oil conforming to
spec.
Intake coupling or intake system leaking Replace
Injector faulty
Replace
Head gasket faulty Replace (*)
The engine temperature
Thermal expansion valve faulty Replace
stays too low
The engine produces Clutch diaphragm leaking Replace (*)
excessive exhaust fumes Valve stem gaskets worn
Replace- (*)
(blue smoke)
Valve stems or valve guides worn Replace (*)
Signs of scratches or scoring on the cylinder walls
Replace (*)
Piston rings or cylinder worn Replace (*)
Head gasket leaking Replace (*)
The engine vibrates Engine fastening loose
Tighten
Bearing or bearing housing worn Replace
Countershaft timing incorrect Adjust (*)
Engine oil pressure too Insufficient oil in the system
Top up with motor oil
low
("~"
LED comes
Oil not to spec.
Replace
on)
Oil pressure sensor faulty Replace (*)
Oil pressure adjusting valve clogged or faulty (the adjusting
Clean or replace (*)
valve remains open)
Oil pump control faulty
Replace (*)
Oil pump worn Replace (*)
Follow~
11-
4 -
00 Release 00/2001-05