Cooling System
11---2
9104 27700
211--- 5
5. Remove the impeller using puller 9104 27700. Press the
shaft out of the pump body in the direction of the fan. Use a
hydraulic press. Support the body so that the shaft bearing
unit has enough space for releasing.
6. Tap out the axial seal in the body using a suitable drift.
Clean all parts and inspect their condition. Replace damaged
parts with new ones.
Note!
If the pump shaft has to be changed, use a recondition-
ing kit. This kit also contains all seals (see Parts Catalogue).
7. Press the shaft into its location in the body using special tool
9051 64900 and fit the circlip.
9051
79300
9051
40200
8353 39425
8353 31202
211--- 6
8. Fit the axial seal. Use as a ”lubricating liquid” coolant be-
tween the shaft and the seal. Two different seal types are
used. Both these seals are fitted with their own drift (see figure
above).
1,8...2,2 mm
178,5 mm
320
174,5 mm
320 E 7536>
420 E 7055>
211--- 7
420
9. Press the impeller and the hub to the correct depth (see fig-
ure) and support the shaft at the other end. Ensure that the
shaft can rotate freely. Fit the rear plate using a new gasket.
C. Reconditioning coolant pump
(Separate ball bearings 320, 420, 620, 634)
1. Drain the coolant. Remove the thermostat housing, fan and
the v---belt.
2. Remove the coolant pump. Detach the pump rear plate and
clean the sealing surfaces.
3. Unscrew the belt pulley fixing nut and remove the belt
pulley. Use puller 9052 48900 if needed.
9101 93200
211--- 8
9104 27700
4. Remove the impeller on the shaft with puller 9104 27700
(320/420---engines) or 9101 93200 (620/634---engines).
5. Remove the circlip in the pump body. Press the shaft to-
gether with bearings in the direction of the fan. Use e.g. a hy-
draulic press. Support the pump body so that the bearings
have enough space for releasing.
