2003 Bombardier Outlander 400 Factory Service Manual, Page 92Get this manual
Section 03 ENGINE Subsection 05 (COOLING SYSTEM)
WATER PUMP SHAFT
Removal
Remove: water pump housing no3 impeller no4 magneto housing cover (refer to MAGNETO SYSTEM) retaining ring no6 with appropriate pliers CAUTION: Never use the retaining ring second timeAlways install new one water pump gear no7