Rotax 912 i series Service Manual

BRP-Rotax
MAINTENANCE MANUAL LINE
EXPANSION TANK, RADIATOR CAP
Figure 7.15: Expansion tank, radiator cap
1 Pressure relief valve 2 Return valve
3 Rubber seal 4
Pressure spring
5 Connection to overflow bottle 6
Opening pressure of the radiator cap
7
Sealing surface
8 Tube connections
9
Sight glass
General note To equalize pressure in the cooling system, an expansion tank is required. If the pressure
in the system rises above 1.2 bar (17.4 psi) as the coolant warms up, the pressure relief
valve (1) opens and the coolant can flow into the overflow bottle via the line (5). When the
coolant cools down, the return valve (2) opens and the coolant is sucked back.
Radiator cap Inspect the rubber seal (3), the pressure spring (4) and the two valves incorporated in the
radiator cap for damage and leaks. If necessary, replace with a new original radiator cap
with 1.2 bar (17.4 psi) (6) opening pressure.
NOTE
The radiator cap must be tightened fully on the expansion tank.
Expansion tank Inspect sealing surface (7) and tube connection (8) of the expansion tank. Carry out visual
inspection of tank for damage and scuffing marks.
Effectivity: 912 i Series
Edition 2/Rev. 0
12–20–00
Page 27
September 01/2018

Rotax 912 i series Specifications

General

Brand	Rotax
Model	912 i series
Category	Engine
Language	English