Re: cooler seal Poll

["Jim Adney" <jadney@vwtype3.org>]

I had a chance to look at the undersides of several type 3 oil 
coolers last night. What I found was not quite what I remembered, 
but close enough.

The undersides of both the early (-69) and late (70-3) coolers are 
pretty much the same. All have small raised bosses around the 
three mounting holes, but the height of the two "bolt" bosses is 
augmented by a step made by an overlap where 2 parts of the 
cooler overlap. The third, "stud", mounting hole has only the raised 
boss. In general, the stud boss is slightly shorter than the 
combined step/boss height of the other 2 holes, but the difference 
is slight.

All these heights are around 2mm, but there is a fair amount of 
variation (1.7-2.2mm).

To be fair, the spacers that I have, which all came from early 
engines which I disassembled, but which might not all be original, 
have some variation. I didn't think to dig any of those out last night, 
but I'm pretty sure that they are about 3mm thick.

All the late engines which I have disassembled came with the outer 
flange of the seal compressed pretty thin, consistent with the 
3.5mm original flange thickness and a ~2mm compressed height. 
This includes engine that came to me undisturbed from the factory.
 
-
Jim Adney
jadney@vwtype3.org
Madison, WI 53711-3054

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