Motorcycle engine cooling and lube system Ducati ST2 (1997-2003)

Disconnecting the cooling system
Before disconnecting the cooling system hoses, drain the coolant following the instruction given in "Changing the coolant" in the "Maintenance" section. Proceed as follows: Loosen the hose clips (1) on the head-radiator hose. Slide off the hose and...

Cooling unit inspection
Excessively high coolant temperatures indicate that the radiator fins are partially clogged. Check the radiator cooling surfaces. Check the cooling fins for leaves, insects, dirt and other objects blocking the smooth flow of air over the cooling...

Disassembly oil pump
Unscrew the oil pump retaining screws. Remove the oil pump. Do not damage or lose the bushes and the O-rings behind it.

Overhaul water pump
Clean the ducts of the chain side cover from any coolant deposits. Check the state of wear of the bearings by turning the rotor slightly; if there is excessive play, remove the bearings as follows: Remove the circlip (1) on the rotor shaft; Unscrew...

Engine lubrication circuit
The engine lubrication circuit includes the following: 1) Oil sump 2) Intake mesh filter 3) Oil pump 4) Delivery cartridge filter 5) By-pass pressure limiter valve 6) Pressure switch 7) Breather valve. The oil pump (3) uses gears and is driven by a...

Overhaul oil pump
Check the following: Clearance between gear teeth: maximum 0.10 mm/0.0039 in. Clearance between gears and pump body: maximum 0.10 mm/0.0039 in. Clearance between gears and cover: maximum 0.07 mm/0.0027 in. The pump cover must not show any signs of...

Reassembly water pump components
Refit the water pump components on the left casing, positioning the seal ring (1) and the counterface (2) as shown in the diagram (see "Engine overhaul: Water pump"). Insert the lubricated rotor shaft from the outside of the casing and secure it...