APRILIA pegaso 650 i.e. Service Manual page 291

Pegaso 650 I.E.
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DEFECT
The engine overheats
The engine temperature
stays too low
The engine produces
excessive exhaust fumes
(blue smoke)
The engine vibrates
Engine oil pressure too
low ("." comes on)
Excessive engine oil
pressure
The engine runs too nois-
ily
Release 00/2002-02
SYMPTOM AND POSSIBLE CAUSES
Insufficient coolant in the cooling system, system leaking
Coolant not to specification
Radiators dirty or coolant pipes clogged
Air in the cooling system
Cooling fan motors faulty
Coolant thermal switch faulty
Thermal expansion valve faulty (locked in closed position)
Coolant pump or coolant pump control drive faulty
Insufficient engine oil in the system
Oil pump or oil pump control faulty, or oil circuit clogged
Motor oil not to spec.
Intake couplings or intake system leaking
Injectors faulty
Head gaskets faulty
Thermal expansion valve faulty (locked in open position)
Too much oil in the engine
Valve stem gaskets worn
Valve stems or valve guides worn
Signs of scratches or scoring on the cylinder walls
Piston rings or cylinders worn
Head gasket leaking
Engine fastening loose
Bearing or bearing housing worn
Countershaft timing incorrect
Insufficient oil in the system
Oil not to spec.
Oil pressure sensor faulty
Low-pressure circuit valve faulty (remains open)
Oil pump control faulty
Oil pump worn
Low-pressure circuit valve faulty (remains closed)
Oil circuit clogged
Oil pressure sensor faulty
The noise seems to be coming from the timing system
Chain tightener shoe worn
Excessive valve clearance
Valve springs exhausted or broken
Decompressor does not stop
End play in exhaust camshaft
Bucket-type tappets or camshaft worn
Timing chain worn
Timing gears worn
Timing chain tightener faulty
The noise seems to be coming from the piston
Piston or cylinder worn
Gudgeon pin or connecting rod worn
REPAIR INFORMATION
REMEDY
Top up with coolant, sub-
ject the system to a pres-
sure test
Use coolant conforming to
specification
Clean
Bleed
Repair or replace
Replace
Replace
Replace (*)
Top up with motor oil
Replace or clean (*)
Use motor oil conforming to
spec.
Replace
Replace
Replace (*)
Replace
Drain excess oil, check oil
level
Replace (*)
Replace (*)
Replace (*)
Replace (*)
Replace (*)
Tighten
Replace
Adjust (*)
Top up with motor oil
Replace
Replace (*)
Change valve spring (*)
Replace (*)
Replace (*)
Change valve spring (*)
Clean oil circuit
Replace (*)
Replace (*)
Adjust (*)
Replace (*)
Change decompressor
spring (*)
Adjust the clearance (*)
Replace (*)
Replace (*)
Replace (*)
Replace (*)
Replace (*)
Replace (*)
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