Header tank (page 2 of 2)

Pressurised cap tightness test

1. Slacken the coupling on the lower end of the testing tool.
2. Install the header tank pressurised cap on the coupling.
3. Pressurise working manually on the piston and check on the pressure gauge that the cap relief valve opens at the specified setting rate.

Pressurised cap setting pressure
0.98 ± 0.1 bar

Water pump

This is of the centrifugal type with vanes with aluminium alloy pump casing and phenolic resin impeller. It is fastened to the crankcase and operated directly through the camshaft belt.

Removal/refitting

• Remove the cam angle sensor (see specific paragraph).
• Slacken the fastening screws and remove the water pump complete with O-Ring.

21 ÷ 26 Nm
2.1 ÷ 2.7 kgm

Engine cooling system tightness test

• Slacken and remove the pressurised cap from the header tank.

WARNING: Absolutely never remove the cap from the header tank when the engine is hot.

1. Screw the hydraulic circuit tightness test tool, fitted with the special coupling, on the header tank filler.
2. Manually pressurise the circuit and check on the tool that the pressure stays at the specified rating. If not, check that there are no leaks from the sleeves or radiator.

Hydraulic circuit control pressure
0.98 ± 0.1 bar

WARNING: For safety reasons, during these checks with the test tool, never allow the pressure to exceed 1.38 bar.