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Old 20th April 2022, 08:26 AM
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Ronin Ronin is offline
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Join Date: Jul 2019
Location: Wales
Posts: 595
Default Cylinder head end cap. Old vs New design

So the V6 and V8 engines have these cylinder head end caps for the cam shafts.

The current design is just a piece of pressed aluminum coated in rubber which gets pushed into the hole. I've had these replaced on my car a year ago and they are leaking straight onto the exahust, so If I'm going to replace them I will probably coat them in sealant too..

The old design for these used in Audi 100 era V6 engines was a machined piece of metal with an o-ring going around it, these are hard to find but still available..

My question is:
Am I better off using the metal cap with an o-ring or the current single piece cap? looking at both designs the one piece rubber coated cap would have a lot more sealing surface (especially coated in sealant) than the o-ring.. but also is a lot more suspectable to temperature and pressure being so thin..
I think VAG just changed and worsened the design cost cutting purposes.

pic for reference:

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