The motors are coupled together by pulleys and a small belt. One is run as a DC motor while the other behaves as a DC generator. The efficiency of the arrangement can be measured by comparing the electrical energy fed to the motor with the electrical energy drawn from the generator.

Crankshaft and bearingsreplacement

Suitable for voltages around 6V.DC. With the belt removed, either motor can be used for any other mechanical purpose. See also EM1760-001

When Kolbenschmidt (OE supplier to VW) offers main bearing sets they use a full oil channel on the #3 main to provide more oiling to the thrust bearings. In other words, you'll used the channeled bearings for all upper shells, a channeled bearing for the #3 cap, and non-channeled shells for main caps 1, 2, 4, and 5