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Check and adjustment клапанных backlashes
Check and adjustment клапанных backlashes
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The given procedure is among those which performance does not demand removal of the engine from the car. Procedure performance should be made on the cold engine. |
Check
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Remove an intermediate cooler of system of pressurisation of air (Intercooler) (Power supply systems, managements of the engine/decrease of toxicity of the fulfilled gases and release of the fulfilled gases see).
Uncover heads of cylinders.
Having turned a cranked shaft so that cams of a drive of inlet and final valves on distributive to a shaft were developed by working ledges upwards, result the piston of the first cylinder in position ВМТ of the end of a step of compression.
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With the help щупа лезвийного type measure size клапанных backlashes, result write down.
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Turning a cranked shaft in a normal direction, repeat procedure for the remained valves, passing from the cylinder to the cylinder as ignition.
Compare results of measurements to requirements of Specifications of the Head the Engine, in case of need make corresponding adjustment.
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Adjustment
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Arrange a camshaft so that the cam of a drive of the inlet valve subject to adjustment has appeared will develop a working ledge vertically upwards.
For the purpose of simplification of access to an adjusting washer, develop a valve pusher риской towards the inlet pipeline.
By means of the special adaptation wring out a pusher downwards and, having taken advantage of a small screw-driver, or other suitable tool, take an adjusting washer.
Having made necessary calculations, pick up a new adjusting washer of a demanded thickness, plant it in a pusher and repeat check.
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At calculation of a demanded thickness of a new adjusting washer it is necessary to take advantage of the following formula:
Н1 = Н0 + (dM - dS)
Where:
Н1 — The Settlement thickness of a demanded washer
Н0 — The Thickness of the removed washer
dM — Size of the measured backlash
dS — Nominal size of a backlash
For example:
Let:
Н0 = 4.00 mm, dM = 0.30 mm,
dS = 0.25 mm,
Example of gathering of the initial information at calculation of a demanded thickness of a new adjusting washer
Then:
Н1 = 4.00 + (0.30 – 0.25) = 4.05 (mm)
In sale adjusting washers of three dimensional ranges arrive: 3.400 3.650 mm and 4.350 4.600 mm with step of 0.050 mm and 3.700 4.300 mm with step of 0.025 mm (only 37 variants). The thickness of a washer can be defined under code number beaten out on it: so, the washer with number 3825 has a thickness of 3.825 mm.