Volvo Penta TAD1630G Workshop Manual page 136

Service procedures - cooling system
23
Turn the pump over to bring the drive side facing upward.
Oil the seat of the ball bearing in the pump housing.
24
1. Pump shaft
2. Bearing race, roller bearing
3. Gear wheel
4. Stop ring
5. Ball bearing
Fit the pump shaft complete with ball bearing, stop ring, gear
wheel and roller bearing race into the pump housing.
134
25
Press in the pump shaft until the ball bearing is about 2
mm (0.080") from the circlip groove in the pump housing.
26
Fit the circlip into the pump housing.
Group 22