Astra H 2009 1.6 petrol - Oil non return valve issues on Astra H Z16XER

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Mon 19 Jun 2023 07:51
Astra H 2009 1.6 petrol - Oil non return valve issues on Astra H Z16XER - Vauxhall Astra owner
Hello all. I have a question about my car. It’s a Z16XER engine. It has a VVT system and when I first start the engine it has a knocking noise for 1 or 2 seconds and then goes. After this the engine runs fine. It only does it when the car has sat for hours without use. I’ve had lots of work done to the car recently. New camshaft dephasers, solenoid valves , aux belt, timing belt, and many other things. I’m told that there is an oil non return valve that allows a bit of oil to stay near the top of the engine to send it directly into the VVT system on start up. But if this valve stops working, the oil drains right back down to the sump and the noise happens because of the time it takes for the oil to shoot back up to the VVT system. I was wondering if this theory is correct? If so how much of a job is it to change the non return valve? Has anyone experienced this before? It’s only started doing this over the past two months.


Thanks in advance
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Mon 19 Jun 2023 09:29
Astra H 2009 1.6 petrol - Oil non return valve issues on Astra H Z16XER - elekie&a/c doctor
I think the valve is part of the oil filter housing and not replaceable separately. Do you have the correct oil filter and has it been fitted correctly ?
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Mon 19 Jun 2023 10:09
Astra H 2009 1.6 petrol - Oil non return valve issues on Astra H Z16XER - Vauxhall Astra owner
I’m not sure because it was changed by the mechanic when the work was done. I’ll have to check it. But would I have to change the oil again and it’s only just been done

Edited by Vauxhall Astra owner on 19/06/2023 at 10:14

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Mon 19 Jun 2023 10:28
Astra H 2009 1.6 petrol - Oil non return valve issues on Astra H Z16XER - elekie&a/c doctor
You won’t need to change the oil again.
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