Disassemble/assemble coolant pump · ar2010w1401b · Mercedes-Benz WIS

AR20.10-W-1401B

Disassemble/assemble coolant pump

21.10.11

ENGINES 541.9 in MODEL 950, 952, 953, 954

ENGINES 542.9 in MODEL 950, 952, 954

W20.10-0008-06

1 Flange

2 Retaining ring

3 Bearing shaft

4 Coolant pump housing

5 Cassette-type seal

6 Impeller

7  Puller

8  Thrust piece

W20.10-0009-06

5 Cassette-type seal

6 Impeller

9  Drift

A Gap between impeller and coolant pump housing

B Distance between coolant pump housing and flange

Modification notes

25.2.00

Bearing shaft of coolant pump must always be replaced

Step 6

	Disassemble
1	Remove coolant pump		AR20.10-W-1271B
2	Use puller (7) and thrust piece (8) to pull flange (1) off the bearing shaft (3)		*000589653300
			*321589006300
3	Remove circlip (2)
4	Use a suitable drift to press bearing shaft (3) out of the impeller (6) and coolant pump housing (4)
	Stationary workshop press 65 t	Workshop press gotis://G_58.2_01.0
5	Remove cassette-type seal (5)
	Assemble
6	Oil bearing shaft (3) at bearing outer race with engine oil and press into coolant pump housing (4) with a suitable drift	 The bearing shaft must always be replaced. Press in bearing shaft only at bearing outer race.
	Stationary workshop press 65 t	Workshop press gotis://G_58.2_01.0
7	Install circlip (2).
 Danger!	Risk of injury to skin and eyes caused by handling hot or glowing objects.	Wear protective gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
8	Heat flange (1) and press onto bearing shaft (3)	 Heat flange to approx. 80 °C.  Counterhold at bearing shaft when pressing on. Measure distance (dimension "B") between coolant pump housing (4) and flange (contact surface of belt pulley).	*BE20.10-N-1002-01C
	Stationary workshop press 65 t	Workshop press gotis://G_58.2_01.0
9	Fit new cassette-type seal (5) onto the bearing shaft (3) and press in as far as the coolant pump housing (4) with the drift	  Check seat of cassette-type seal on shaft and in coolant pump housing.	*352589081500
10	Press impeller (6) onto bearing shaft (3)	 Counterhold at bearing shaft when pressing on.
		Measure gap (A) between impeller and coolant pump housing (4).	*BE20.10-N-1001-01C
		Feeler gauge
11	Rotate coolant pump at flange (1) and Check for smooth running
12	Install coolant pump		AR20.10-W-1271B

Test and adjustment values for coolant pump

Number	Designation		Engine 541.9, 542.9 except code ML3	Engine 541.9, 542.9 with code ML3


BE20.10-N-1001-01C	Gap between impeller and coolant pump housing (A)	mm	0.6 to 1.0	0.6 to 1.0
BE20.10-N-1002-01C	Distance between coolant pump housing and flange (B)	mm	100	160.6

321 589 00 63 00

352 589 08 15 00

000 589 65 33 00

Thrust piece

Puller

Drift

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