[T3] Time for an engine

[Keith Park]

If this is true, perhaps I should run the marvel mystery oil thru it before
I sign off on it... it does a great job of removing carbon from under the
intake valves...

When I did the last heads 55K ago, there was a pretty good ridge on the top
as I recall, I have a pix of it but its hard to tell from a pix.

Keith


On 20 Jun 2018 at 20:46, Keith Park wrote:

> Well Im certainly curious too, see what it looks like in there
> after 27 years. I have pix of the cylinders when I last did the heads, but
> that was 55Kmi ago, at that time they looked perfectly smooth but worn
> past ALL the hone marks.

The thing that's most important is the amount of "bell mouth" that the 
cylinders have developed. They get more wear at the top of the piston
travel, 
due to more heat there and the reduced lubrication at that end of the
stroke. 
This wear is difficult to measure without a bore gauge, but you can get an 
idea by how much of a ridge there is at the top, above where the piston
rings 
never go. Note that there is never a similar ridge at the bottom of the
piston 
ring stroke, where it's cooler and better lubricated.

It's possible that you'll find your #2 cylinder is no worse off than the
rest, but 
carbon may have built up around those rings just a bit more than around the 
other rings, just enough to keep those rings from expanding freely and 
sealing  perfectly.

-- 
*******************************
Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
*******************************

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