Vaz 21213, Repair Manual, Page: 37 / 222

Water pump drivebelt tension adjustment
The belt tension is checked by exerting a hand pressure on
the chain between the alternator pulley and pump pulley or
between the pump pulley and crankshaft pulley. With proper ten-
sion, slack A in the belt (Fig.2-61) at 98 N (10 kgf) must be 10-15
ÏÏ, while at the same pressure the deflection Ç must be within
12-17 mm.
To adjust the belt tension, slacken the alternator retaining nuts,
move the alternator off the engine (to increase tension) or towards
the engine (to decrease tension), then tighten the nuts. Turn the
crankshaft two revolutions clockwise and check the belt tension.
No excess tension of the belt is allowed to prevent hazardous
loads to the alternator bearings.
Coolant pump
Dismantling.
Carry out the coolant pump dismantling as
detailed below:
- disconnect pump housing 5 (Fig.2-62) from cover 3;
- place the cover in vice using protective pads; remove
impeller 2 (Fig.2-63) from the shaft using picker Ä.40026;
- remove hub 2 (Fig.2-64) of the fan pulley from the shaft
using puller Ä.40005/1/5;
- undo lock screw 8 (Fig.2-62) and force out the shaft with the
bearing, applying force to the bearing race;
- withdraw oil seal 7 from housing cover 3.
Inspection. Check the bearing axial clearance. This opera-
tion is mandatory if the pump is noisy. The clearance must not
exceed 0.13 mm at load of 49 N (5 kgf). Renew the bearing com-
plete with the shaft when the clearance is bigger.
Always remember to renew the pump oil seal and pump-to-
cylinder block gasket during overhaul.
Check the pump housing and cover for cracks or deformation,
which are not permitted.
Reassembly. The assembly is carried out as follows:
- using the appropriate tool, fit the oil seal to the housing
cover, look out not to skew;
- press in the bearing and shaft, applying the force to the
bearing race so that the holes for the locking screw are matched;
- tighten the bearing lock screw and punch the seat over the
contour to prevent its self-loosening;
- using tool Ä.60430 (Fig.2-65) press the pulley hub onto the
shaft, maintaining a size of (84.4±0.3) mm. When the hub is of
sintered quality, press in the new hub only.
- using tool A60430, press the impeller onto the shaft, main-
taining a size of (48-0,2) mm, as shown in Fig.2-62. This ensures
the required clearance between the impeller blades and pump
housing;
- reassemble the pump housing with the cover, having placed
the gasket in-between.
Thermostat
To test whether the unit is serviceable, check the temperature
of the main valve opening and valve travel.
Using the test bench Åë-106-000, suspend the thermostat
with a piece of string in a container of water or coolant. Position
the bracket arm of the gauge against main valve 9 (Fig.2-66).
37
Fig.2-64. Removing the pulley hub:
1 - pump housing cover; 2 - pulley hub; 3 - tool Ä.40005/1/5
Fig.2-65. Fitting the impeller to the pump shaft using tool Ä.60430:
1 - base; 2 - pump shaft; 3 - pump housing cover; 4 - shell; 5 - set screw