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An occasional ticking or rattling noise from the intermittent hydraulic valve adjuster (HVA) elements may occur during cold engine starts or frequent short-distance driving. In these situations, the HVA elements may not yet have been supplied with sufficient amounts of air-free oil. This condition will not cause any
damage to the engine, and usually remedies itself with a longer driving distance or operating times at full operating temperature.
HVA bleeding procedure:
The bleed time may take anywhere from between two minutes and (in rare cases) to a maximum of 30 minutes. This procedure is to be performed
on a level surface with the vehicle stationary, and in a properly ventilated area.
Before performing HVA bleeding procedure chack that:
*Engine oil level is correct
*Engine is at operating temperature
-Bring the engine up to an operating speed (no load) of 2000-3000 rpm and maintain this condition for three 1. minutes (bleeding procedure).
Let the engine idle for 15-30 seconds and reevaluate whether the noise is still present or not.
-Engine quiet - procedure is finished.
-Engine noise is still present - repeat the procedure; perform steps #1 3. and #2 up to a maximum of 5 times.
-Only if the noise remains after performing the bleeding procedure 5 times: proceed by performing the procedure for a final time, also at an
engine operating speed of 2000-3000 rpm, but for a total time duration of 15 minutes.
If bleeding procedure is unsuccessful or ticking noise returns shortly after HVA bleeding procedure cylinder head replacement may be necessary.