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D2 - Engine Bay Everything under the bonnet |
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#1
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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: |
#2
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Quote:
D176501A1 is described as 'Silicon sealant' and costs £25. As they say, other brands are available.
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts Sold! 2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II Headlights My DIY jobs - Fan Jet Windscreen Washers, Retrofitted Electric Side Blinds |
#3
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Good find ^ I've never noticed that. Big Red's went in dry and aren't leaking so I guess I got lucky on those. I wonder what is different on the V6 to the V8 that requires sealant?
Elring Dirko is the aftermarket version of the OE sealant |
#4
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There is more than one Dirko isn't it?
I think there is at least grey and red with the red being for higher temps
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure |
#5
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The grey one then
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#6
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Quote:
I think i'll order a pair of metal caps and see how it goes. The part number for the o-ring is no longer on etka so i will have to experiment and find one that fits |
#7
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I found an older version of the parts catalog where description doesn't say to use the new cap as the solid metal one is obsolete but instead it says "for engines without vacuum pump", I wonder why that is... I guess the pressure in the crank case is positive so it needs better seals?
078145117E O-Ring f. engines without vacuum pump 078103491A bungs f. engines without vacuum pump Last edited by Ronin; 22nd April 2022 at 10:50 AM. |
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