Valve covers on A14 NET NEL engines become damaged over time. To diagnose a cover failure, leave the engine at idle speed, obtain a thick foam, e.g. to check the tightness of the LPG installation, and proceed as in the video:
In most cases, diagnosing a damaged cover is quite simple. If there is a strong suction of the oil filler cap or the left air is sucked in through the vent hole of the pneumothorax valve, we are 100% certain that the cover is damaged. Sometimes, however, it happens that the cover does not show any signs of wear, but is still damaged and causes increased oil consumption (up to several liters per 100 km. This leads to heavy smoking. Below we present videos with examples of covers: 1.6 XEP, 1.4 Turbo 120-140 HP, and 1.6 SIDI 170 HP, in which we show how to check whether the diaphragm valve is damaged.
There are two causes of damage to the valve cover diaphragm:
The description of checking the valve can be found here: https://www.xn--pokrywy-zaworw-xob.pl/kolector-ss%C4%85cy-a14net-nel
When assembling the cover, it is recommended to use a gasket:
VICTOR REINZ no.: 71-42349-00
ELRING no.: ELR 773.410
This is quite important for the proper operation of the cover.
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