Operation Manual

Job Card No.:
Engine:
Filing No.:
Coolant Circulation Pump
Reconditioning
0178-37-10 1816
09.07.02 Page 2 of 2
S/BVM 628
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Job:
Removing the Pump (Fig. 1)
Stop engine. Close shut-off valves in suction and delivery lines of pump. Drain water from pump by removing
plug (26). Disconnect suction and delivery lines between pump and shut-off valves. Unscrew hex. bolts (2)
and take down intake (1). Fasten holding device (lock) (21) - Fig. 2 - by means of bolts (2) to volute casing (6).
Turn impeller (5) until the balancing holes coincide with one of the two holes in the lock. Push an M6x70 bolt
or a pin of 5 to 6 mm dia. through the lock hole, thus blocking the impeller. Unscrew cap nut (34). Remove lock
(21) and withdraw impeller. Take off water seal (31). Undo hex. bolts (7) and take off volute casing. Undo hex.
bolts (10). Pull out bearing housing (9), push sideways and tilt so that it can be lifted out behind the vibration
damper.
Dismantling the Pump (Fig. 1)
Carefully drive out shaft (32) by means of hammer and square timber block in downward direction. Remove
circlip (17) and withdraw ball bearing (15) by puller. Remove spacer (16). Pull off gear (14) along with bearing
bush, plate (19) and coupling assembly (20) from shaft (32). Take out six rollers (13) from coupling spider (12).
Remove backing ring (30) and ring (28) with oil seal (25) from bearing housing (9). Clean all components and
inspect for wear.
Inspect impeller (5), intake 1 and volute casing (6) for erosion, shaft (32) in the zone of seals (25) and (31) for
scoring, as well as axial water seal (31) and radial oil
seal (25) for tightness. Replace O-seals and any
worn parts, especially bearings (15) and (23).
Reassembling the Pump (Fig. 1)
Install new rollers (13). Slip gear (14) with bearing
bush, plate (19) and spider (20) as an assembly onto
shaft (32). Fit spacer 16, ball bearing (15) and circlip
(17).
Install oil seal(25) with ring (28) and O-seal (24) in
bearing housing (9). Push shaft (32) with bearing (23)
and coupling into bearing housing (9) Install O-seal
(22).
Refitting the Pump (Fig. 1)
Carefully push bearing housing (9) with shaft (32) into
pump chest (hole ”X” down) and secure by bolts (10)
with lockwashers (11). Fit backing ring (30) and O-seal
(29). Install O-seal (4) in bearing housing (9). Fit volute
casing (6) and secure by bolts (7) plus lockwashers (8).
Slightly wet sealing lip of seal (31) with coolant (not
with lubricant). Slip seal (31) onto shaft (32).
Check that no lubricant or dirt is present between seal (31) and backing ring (30), or between impeller (5) and
shaft (32). Insert impeller (5), located by dowel sleeve (35). Install O-seal (33). Mount impeller (5) with stop (21)
- Fig. 2 - (see ”Removing the Pump”). Tighten fastening nut as per Section 3.5, item 19.
Put intake (1) with new O-seal (4) in place and secure by bolts (2) plus lockwashers (3). Connect water piping.
Open shut-off valves. Fill in engine coolant and check its condition. (Section 6.4).
During the trial run, check pump for correct water pressure and freedom from leaks.
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