Copper and aluminum are fairly soft, heat and corrosion resistant materials, ideally suited for use as gasket material.
It is a misconception that a copper or aluminum gasket can be reused. Once assembled, the gasket has taken on the shape of the interfaces, and reuse will inevitably result in leakage.
The copper gaskets mentioned here are primarily used to seal the threaded ends of the oil sump plate, but they are also used for other purposes. Below you will find, per Volkswagen model, where these rings are used and how many of them are needed in total.
VW Beetle
-oil sump plate 6 pieces
-main brake cylinder blind plug from 8.1966 1 piece
Karmann Ghia
-oil sump plate 6 pieces
-master cylinder blind plug from 8.1966 and later 1 piece
Split Bus
-oil sump plate 6 pieces
-steering box bottom cover 2 pieces
-dual brake system master cylinder blind plug 1 piece
Bay Window Bus
-oil sump plate Type 1, pieces
-oil sump plate Type 4, 2 pieces
-master cylinder blind plug 1 piece
VW Vanagon
-oil sump plate Type 4 engines, 1 piece
-oil sump plate CT/CZ, 6 pieces
-crankcase bolt WBX to 7.1983 1 piece
-thermostat housing flange WBX to 7.1985 2 pieces
-fuel filter bleed nipple Diesel engines 8.1986 to 7.1989 1 piece
Type 3
-oil sump plate 6 pieces
VW type 181
-oil sump plate 6 pieces
-stand heater fuel connection on nozzle 1 piece
-master cylinder blind plug 1 piece
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