If your machine shop specializes in air cooled vws they may have a set of main bearings ready.
Air cooled vw thrust bearing.
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.
Theory behind thrust wear.
It s important to note that each thrust bearing will have a bearing tang on it.
How to measure you aircooled vw main bearing set.
Watch as john edwards costa mesa r d automotive.
The thrust measurement is determined by measuring the thickness of the last main journal on the flywheel end of the engine.
Oversized thrust bearings are typically offered in 1 and 2mm os versions.
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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.
Includes 6 shells to do 1 engine.
Stock vw cam bearings only had 1 thrust bearing this set provides 2 to halve the thrust bearing wear.
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.
Generally machine shops will cut down the engine case at the flywheel side to perfectly match an oversized bearing.
So you may have heard people in the scene referring to end float and engines being worn out with excessive play.
Main journal thrust is the final measurement that must be performed when sizing your air cooled vw main bearings.