Vaz 21213, Руководство по ремонту, Страница: 34 / 222

Camshaft bearing housing. Wash and clean the bearing
housing, flush clean the oilways.
Check the diameters of the holes in the bearings. When the
clearance between the camshaft journals and bearing surfaces
exceeds 0.2 mm (wear limit), renew the bearing housing.
The inner bearing surfaces should be smooth, with no scores;
renew the bearing housing in case of damages. Check the hous-
ing for cracks; if this is the case, renew the bearing housing.
Chain tensioner. When the tensioner plunger is seized in the
housing, dismantle the chain tensioner. For that undo cap nut 1
(Fig.2-56), push plunger 6 full way, then tighten the cap nut. File
the housing edges at the points B of centre-punching, withdraw
plunger 6 with spring 4. Undo the cap nut and withdraw rod 3
complete with spring 7 and washer 5. Prise free spring ring 9 and
take out clamping collet 8 from cap nut 1.
Check collet 8, core 3 and plunger 6 for scores, check the
mating surfaces of the tensioner shoe and plunger for deep
scores. Always renew any damaged components.
The spring tension should be within the range specified in
Fig.2-57; otherwise renew the spring.
Check to see the shoe and chain damper do not have excess
wear; renew them when applicable.
Refitting is a reversal of removal. Once the plunger is refitted,
center-punch housing 2 at three points B. Make certain the pro-
jections caused by centre-punching do not contact the surface A
during the plunger stroke.
Note: The spring ring is used in some vehicles instead of
centre-punching.
Camshaft timing chain. Wash the chain in kerosine, exam-
ine the chain links. Check to see there are no scores, cracks or
other damages.
In the course of the engine operation the chain lengthens.
The chain deems operable as long as the tensioner ensures its
proper tension, i.e. the chain length is maximum 4 mm longer.
Check the chain length with the help of tool 67.7824. 9521
(Fig.2-58), having 2 special-type wheels 1 on which the chain is
located. Using counterweight 3 the chain is extended through
applying force of 294 N (30 kgf) or 147 N (15 kgf). Use adjuster
nut 2 to ensure the counterweight axis is parallel to the tool base.
Apply force 294 N (30 kgf) with the counterweight in the
extreme right position, then decrease the force by 147 N (15 kgf)
moving the counterweight fully to the left. Repeat both operations
and determine the chain difference on the length L (Fig.2-59)
between the axis of the wheels. Using vernier calipers, measure
the distance between the wheels , then add the diameter d value
to get the distance L between the wheels axes.
For a new chain the distance L between the wheels axes is
495.4-495.8 mm. Renew the chain, when its length is 499.5 mm.
Before refitting, smear the chain with engine oil.
ëooling system
Refer to the cooling system layout as shown in Fig.2-60.
Checking coolant level and density
Check to make certain the coolant level in the expansion tank
is adequate. When the engine is cold (15-20°C), the coolant level
within the expansion tank must be 3-4 cm above the «MIN» mark.
WARNING. Always check the coolant level on the cold
engine, since its volume increases with rise in temperature;
the coolant level can be significantly higher with the hot
engine.
When necessary, use an areometer to check the coolant
density to be 1.078-1.085 g/cu.cm for TOSOL A-40 which is used
in VAZ vehicles.
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Fig. 2-58. Tool 67.7824.9521 for checking the chain wear (extension):
1 - roller; 2 - adjuster nut; 3 - counterweight
Fig.2-59. Checking the chain wear (extension):
1- pulleys