Re: oil seal (poll)

[Bernard Seront <serontb@wanadoo.fr>]

>From: "Jim Adney" <jadney@vwtype3.org>
>On 6 Mar 00, at 9:21, Bernard Seront wrote:
>
>> The seal is 3.5 mm thick, I mean
>> the central part wich is of a larger diameter (is this clear?), it
>> goes in between the cooler and the flat piece of the case where the
>> cooler sits. Without "spacers" one would need to compress the seal to
>> a thickness of zero to get a good contact and mating between the
>> cooler and the case. I hope I make my point clear; you must have
>> something, if not a spacer like we found, the cooler itself needs to
>> incorporate it. Is the bottom tin of your cooler flat or do you have
>> any protusion that would fulfill the "spacing" function?
>
>Yes, You make this quite clear, and I agree with you completely. 
>This is the crux of the matter. All the coolers that I have seen have 
>~3mm extended bosses around each of the 3 bolt/stud holes. Both 
>early and late coolers are identical in this respect, which explains 
>why the 8/10 adaptor seal can work both ways; the case is always 
>flat in this area.
>
I do have extended bosses around each of the 3 bolt/stud holes. Two of
them, the ones closer to the oil passageways are about 1.2 mm thick, the
third one is about 1.5 mm thick.
Now almost everything becomes clear : we need a "real" spacing between the
cooler of about 3 mm (given a thickness of 3.5 mm for the seal), I figure a
compression of 0.5 mm would seal the passageways (sounds ok?). If the
bosses are thick enough that's fine, otherwise you need to adjust with
extra spacers.
>
>I suppose it is possible that VW bought coolers from different 
>vendors with different geometrys. If so, I have never seen one like 
>yours, and VW certainly failed to document it correctly. We should 
>look for any identifying marks. I know that there is a date code on 
>all of these. Perhaps there is a maker's mark, also. 
>
There's no mark on the cooler except the code number (311 ... B) and the
date (1/71) .
I cannot say for sure that my cooler has not been machined or dammaged, but
I don't feel so. On the other hand I can't imagine Volkswagen being
careless on such an issue by having two models of coolers not documented,
and a critical sealing problem ...

Please anybody that have access to a cooler, check the thickness of the
bosses, and if any, the spacers.

Bernard.

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