Disassembly
To disassemble the pump:
- disconnect the pump body from the cover 2 (pic. 2-62);
Pic. 2-62. Longitudinal section of the coolant pump: 1 - body; 2 - cover; 3 - bracket for fastening the fan casing; 4 - fan; 5 - pulley hub; 6 - overlay; 7 - roller; 8 - pulley; 9 - bearing lock screw; 10 - bearing; 11 - stuffing box; 12 - impeller
- secure the lid in a vise using spacers and remove the impeller from the shaft with puller A.40026 (pic. 2-63);
- remove hub 2 (fig 2-64) fan pulley from the roller using a puller А.40005/1/5;
- unscrew the locking screw 9 (pic. 2-62) and remove the bearing with the pump roller;
- remove gland 11 from housing cover 2.
Control
Check the axial clearance in the bearing. This operation must be done if significant pump noise is noted. The gap should not exceed 0.13 mm at a load of 49 N (5 kgf). If the clearance is greater, replace the bearing. It is recommended to replace the pump seal and the gasket between the pump and the cylinder block during repairs.
Inspect the pump housing and cover for deformation or cracks.
Assembly
Assemble the pump in the following order:
- install the gland with a mandrel, avoiding distortion, into the housing cover.
- press the bearing with the roller into the cover so that the seat of the locking screw coincides with the hole in the pump housing cover;
- tighten the bearing lock screw and caulk the contours of the socket so that the screw does not loosen;
- press on with tool A.60430 (pic. 2-65) on the roller hub of the pulley, keeping the size
- 84.4±0.1 mm. If the hub is sintered, press on only the new hub;
- press the impeller onto the roller using tool A.60430, ensuring a gap between the impeller blades and the pump housing of 0.9-1.3 mm;
- assemble the pump housing with the cover, placing a gasket between them.
Pic. 2-65. Pressing the impeller onto the pump shaft with tool A.60430: 1 - support; 2 - pump roller; 3 - pump housing cover; 4 - glass; 5 - set screw