Opel Astra, Zafira

Since 1998 of release

Repair and car operation

Check and adjustment of backlashes of valves (engines of 1.7 l DOHC)

On engines of 1.7 l SOHC and 2.0 l are established equipped with hydraulic jacks.

Check

Importance of correctness of installation of backlashes in клапанном the mechanism of any internal combustion engine is difficult for overestimating, in view of its influence on efficiency of functioning of the engine.

Check should be made on the cold engine!

PERFORMANCE ORDER

Cock a lay brake, then поддомкратьте redock of the car and establish it on props. For the purpose of maintenance to a pulley of a cranked shaft remove the right forward wheel. At a corresponding complete set remove protection картера the car.
Uncover газораспределительного the mechanism (Removal and cover installation газораспределительного the mechanism see). Remove atomizers (see the Head of the Power supply system and release).
Turn the engine in a normal direction (clockwise if to look on the right side of the engine) for a bolt of a pulley of a cranked shaft before combination of an adjusting label on a pulley of the last with the index on a cover of the oil pump.
Continue to turn a shaft rotate a cranked shaft in a former direction until cams of a drive of the valve of 1st cylinder of an inlet camshaft and the valve of 3rd cylinder of a final shaft will not be developed by heels to pushers (valves are closed). Now it is possible to start check performance.
Will draw on a sheet of paper the scheme (grid) of adjustment of valves, having numbered cages according to numbering of valves. Fill the formed table, entering in cells rating values of backlashes of each valve.

Pay attention that backlashes in inlet and final valves are identical.

Having developed shaft in the demanded image (see above), measure backlashes between heels of cams and end faces of pushers with щупа лезвийного type. Results of measurements write down in corresponding cages of the table.

For check of backlashes of the inlet valve of 3rd cylinder and final 4th turn a cranked shaft for a half-turn (180 °). Measure backlashes, write down results.
Operating in a similar manner, consistently turning a cranked shaft on 180 °, measure backlashes of the final valve of 2nd cylinder and inlet 4th cylinder, then final 1st cylinder and inlet 2nd. Fill all cells.
If results of measurements do not fall outside the limits admissible ranges (Specifications see), establish into place a cover газораспределительного the mechanism (Removal and cover installation газораспределительного the mechanism see).
Establish atomizers (see the Head of the Power supply system and release).
Establish protection картера and a wheel, then lower the car on the earth and tighten wheel bolts with demanded effort.
If any backlashes are exposed incorrectly, execute corresponding updating (see further).

Adjustment

PERFORMANCE ORDER

Turn a cranked shaft so that the cam of a drive of the valve subject to adjustment was developed by a heel to a pusher.

Make sure in that the engine is not in position ВМТ of the corresponding valve as for replacement of an adjusting washer it is required to compress клапанную a spring that can lead to a valve emphasis in the piston bottom.

Develop a pusher a cut in the top edge forward (final pushers), or back (inlet pushers) on the engine.

At absence near at hand special adaptation KM-6090, enter the big screw-driver with a flat sting to honey edge of a pusher and the camshaft basis. Accurately, operating with a screw-driver as the lever, drown a pusher before possibility occurrence to remove an adjusting washer. Extraction of a washer most easier to make by means of a magnetised core.

Wipe a washer and by a micrometer measure its thickness.

On washers there are marks which however as a result of deterioration can appear lost.

Add to the received result result of measurement клапанного a backlash. For reception of a demanded thickness of a new washer from the received sum subtract size of rating value of a backlash, for example:
Result of measurement клапанного a backlash And = 0.35 mm
Thickness of the removed washer In = 2.70 mm
Sum S = And + In = 0.35 + 2.70 = 3.05 mm
Rating value of a backlash With = 0.40 mm
Thickness of new washer D = S - With = 3.05 – 0.40 = 2.65 mm

Probably it will be possible to make demanded by simple shift of washers from one pushers on others. Write down and keep for possible future adjustments of a thickness of all washers.

Prepare a washer of a demanded thickness, grease with its pure impellent oil. Wring out a pusher and lay in it a washer marks downwards.
Operating in a similar manner, modify backlashes of the remained valves requiring adjustment.
Some times turn a cranked shaft on purpose усадки washers on pushers, then execute control check of backlashes before cover installation газораспределительного the mechanism. Establish a cover (Removal and cover installation газораспределительного the mechanism see).
Establish protection картера and a wheel, then lower the car on the earth and tighten wheel bolts with demanded effort.