This is all based around the main bearing wearing over a long period and developing a more sloppy fit in the journal the bearing sits in.
Air cooled vw thrust bearing.
If your machine shop specializes in air cooled vws they may have a set of main bearings ready.
If they aren t be prepared to make another trip back.
Stock vw cam bearings only had 1 thrust bearing this set provides 2 to halve the thrust bearing wear.
Generally machine shops will cut down the engine case at the flywheel side to perfectly match an oversized bearing.
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Here s a neat trick to save your air cooled vw engine block when the thrust had been knocked out and a double oversize thrust bearing won t work.
This is a really good idea to use on any engine that uses stiffer than stock valves prings or uses a bigger than stock camshaft.
It s important to note that each thrust bearing will have a bearing tang on it.
Theory behind thrust wear.
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The thrust measurement is determined by measuring the thickness of the last main journal on the flywheel end of the engine.
Includes 6 shells to do 1 engine.
The stock measurement for thrust is 0 864 and it can be cut as much as 0 080 under.
So you may have heard people in the scene referring to end float and engines being worn out with excessive play.