4.5.4. Check and adjustment of valvate gaps
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This procedure is among those which performance does not demand removal of the engine from the car. Implementation of the procedure has to be made on the cold engine. |
Check
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- Remove an intermediate cooler of system of pressurization of air (Intercooler) (see Power supply systems, managements of engine/decrease in toxicity of the fulfilled gases and production of the fulfilled gases).
- Uncover a head of cylinders.
- Having turned a bent shaft so that cams of the drive of inlet and final valves on distributive to a shaft were developed by working ledges up, bring the piston of the first cylinder into the provision of VMT of the end of a step of compression.
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- By means of the probe of lezviyny type measure the size of valvate gaps, write down result.
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- Turning a bent shaft in the normal direction, repeat the 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 Dvigatel, in case of need make the corresponding adjustment.
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Adjustment
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- Arrange the camshaft so that the cam of the drive of the inlet valve which is subject to adjustment was developed by a working ledge vertically up.
- For the purpose of simplification of access to an adjusting washer, develop a pusher of the valve risky towards the inlet pipeline.
- By means of special adaptation wring out a pusher down and, having used the small screw-driver, or other suitable tool, take an adjusting washer.
- Having made necessary calculations, pick up a new adjusting washer of the required thickness, put her in a pusher and repeat check.
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When calculating of the required thickness of a new adjusting washer it is necessary to use the following formula:
H1 = H0 (dM - dS)
Where:
H1 — the Settlement thickness of the required washer
H0 — Thickness of the removed washer
dM is Size of the measured gap
dS — the Nominal size of a gap
For example:
Let:
H0 = 4.00 mm, dM = 0.30 mm,
dS = 0.25 mm,
Example of collecting initial information when calculating of the required thickness of a new adjusting washer
Then:
H1 = 4.00 (0.30 – 0.25) = 4.05 (mm)
Adjusting washers of three dimensional ranges go on sale: 3.400 ÷ 3.650 mm and 4.350 ÷ 4.600 mm with a step of 0.050 mm and 3.700 ÷ 4.300 mm with a step of 0.025 mm (only 37 options). Thickness of a washer can be determined by the code number which is beaten out on it: so, the washer with number 3825 has thickness of 3.825 mm.
