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[dave the builder]

the cam cover you ordered will probably fit one of your astras

you can buy just an orange DIAPHRAGM if it is split and the filler cap/dipstick  has a big vacuum 

[dave the builder]

video valve in johnny foreigner speak ,but it shows the DIAPHRAGM

[terry paget]

+Thanks for the reference for the gasket, Dave. Is there a similar cheap cam cover available for this Astra?
Thanks or the video of the orange gasket. I will reserch mine today, but if I can buy the whole cover for £28 I will do so.
When I removed the old cam cover the spring clip which holds on the hose from the manifold went pinging off somewhere and vanished. Problem?

[dave the builder]

is it this one clicky Rocker Cover 55564395    
£28.49

you will need to CHECK the part number on the original cover matches

if the pcv valve is fine ,why not just replace the gasket 

[terry paget]

is it this one clicky Rocker Cover 55564395    
£28.49

you will need to CHECK the part number on the original cover matches

if the pcv valve is fine ,why not just replace the gasket 

Thanks Dave, that's the one, right part number, and all the pictures correspond.
Thanks for the video, instructive, pity it's not in English. Not clear how I check the pcv valve - do I lift the dip stick engine running and listen, same with filler cap?
The cam cover is now off and the gasket is ruined, making diaphragm checking impossible, it looks quite tricky to remove the pcv valve and replace the diaphragm, and gasket delivery was to be December 28-30, while the rocker cover delivery was December 22-24, and I would like the car recommissioned ASAP; all reasons to buy the complete cover.

[dave the builder]

Thanks Dave, that's the one, right part number, and all the pictures correspond.
Thanks for the video, instructive, pity it's not in English. Not clear how I check the pcv valve - do I lift the dip stick engine running and listen, same with filler cap?

when assembled and running engine, the oil cap should lift off, if there is a big vacuum pulling the cap on ,the pcv valve is  duff.
similarly, if if you pull the dip-stick and theres a big vacuum , the pcv valve is duff .

as for the lost horse shoe clip that retains the pipe between rocker cover and throttle body, is there one on the spares car ?
it's pretty important as it holds that pipe on .

[terry paget]

Thanks Dave, that's the one, right part number, and all the pictures correspond.
Thanks for the video, instructive, pity it's not in English. Not clear how I check the pcv valve - do I lift the dip stick engine running and listen, same with filler cap?

when assembled and running engine, the oil cap should lift off, if there is a big vacuum pulling the cap on ,the pcv valve is  duff.
similarly, if if you pull the dip-stick and theres a big vacuum , the pcv valve is duff .

as for the lost horse shoe clip that retains the pipe between rocker cover and throttle body, is there one on the spares car ?
it's pretty important as it holds that pipe on .

Sadly, no. I have already used it on another job. I looked on e-bay for a spare hose with clips, but could not find one. I was hoping I could improvise with a bit of wire. Of course it might be under the car, but I cannot see it.

[terry paget]

https://www.ebay.co.uk/itm/VAUXHALL-OPEL-ASTRA-H-G-VECTRA-C-ZAFIRA-A-B-CRANKCASE-DIAPHRAGM-VALVE-COVER/273216769724?hash=item3f9cfd0ebc:g:ADcAAOSwPHxbGUfx
Phew, found one!

[dave the builder]

https://www.ebay.co.uk/itm/VAUXHALL-OPEL-ASTRA-H-G-VECTRA-C-ZAFIRA-A-B-CRANKCASE-DIAPHRAGM-VALVE-COVER/273216769724?hash=item3f9cfd0ebc:g:ADcAAOSwPHxbGUfx
Phew, found one!

that's just a replacement diaphragm in your link ,which will be fitted to the replacement cover anyway .
I assume you posted a wrong link and have found a pipe or horse shoe clip replacement

[dave the builder]

the complete pipe with 2 clips is 55556495 and expensive 
clicky link
you can probably get the clips ,i'm sure quite a few have pinged off ,never to be seen again 

[terry paget]

video valve in johnny foreigner speak ,but it shows the DIAPHRAGM

I fitted the correct cam cover to Jonny's car and returned it him, misfire cured, no more fault codes, thanks for your help.
As a challenge I tried to remove the diaphragm, and see if it was broken. The video was very useful, but I am struggling to remove the diaphragm holder. It seems to be designed for easy assembly, not for ease of dismantling.

[dave the builder]

video valve in johnny foreigner speak ,but it shows the DIAPHRAGM

I fitted the correct cam cover to Jonny's car and returned it him, misfire cured, no more fault codes, thanks for your help.
As a challenge I tried to remove the diaphragm, and see if it was broken. The video was very useful, but I am struggling to remove the diaphragm holder. It seems to be designed for easy assembly, not for ease of dismantling.

well done on the fix terry 

if you want to remove the diaphragm, gently heat the plastic with a hot air paint stripper to soften it
word of warning though , be careful ,the oil residue could catch fire
eyebrows do grow back eventually though 

[terry paget]

Thanks for the advice Dave. I had already used a hot air blower to soften the plastic, but it still would not shift. Trying harder, all I achieved was to damage the cam cover. I released the end clips all right, but heaving away on the circular join all I did was break off the plastic around the clips. I am puzzled, because the diapragm is available as a spare part. Maybe on young cars these parts come apart more easily. Haynes does not seem aware of the diaphragm. The availability of complete cam covers as spares suggests this is the way to go.