Reconditioning

Self-made tools







Spacing plate
b = 2 mm







Pressing-in-sleeve







1 Fan hub
2 Coolant pump shaft with compact bearing
3 Bearing housing
5 Slide ring seal
6 Counterring
7 O-ring
8 Impeller
a 22.8 - 23.2 mm
b 2 mm
C Vent holes

Disassembly







1 Support bearing housing with pertinent tubing and press out coolant pump shaft by means of a mandrel.
2 Knock sliding ring seal out of bearing housing.







3 Remove counterring from impeller.


NOTE: Always replace compact bearing and fan hub following disassembly.







Assembly
4 Press in new compact bearing flush with bearing housing by means of a tube positioned against outer race.

Do not press against coolant pump shaft.







5 Coat mounting bore of sliding ring seal in bearing housing slightly with sealing compound (Part No. 001 989 25 20).

Press-in or knock-in sliding ring seal with pressing-in sleeve.

Attention!
Support only against bearing housing and not against coolant pump shaft.







6 Coat O-ring on counterring with brake cylinder paste and push with chamfered side (arrow) into thoroughly cleaned impeller.







7 Clean sealing surfaces of counterring and sliding ring seal free of dust by means of a chamois cloth.
8 Degrease both shaft stubs and impeller in bore.
9 Press-on impeller flush with shaft while supporting coolant pump shaft.







10 Heat fan hub on a hot plate to approx. 300 °C (annealing color dark - up to light blue).

Place heated fan hub on a recessed base. Hold spacing plate on coolant pump shaft, slip coolant pump shaft on fan hub and apply a blast of compressed air against hub. Wait for a few seconds until fan hub is firm and then cool immediately in water bath.