Volkswagen Air-Cooled 1970-1981 Repair Guide

Camshaft and Timing Gears



Removal of the camshaft requires splitting the crankcases. The camshaft and its bearing shells are then removed from the crankcase halves. Before reinstalling the camshaft, it should be checked for wear on the lobe surfaces and on the bearing surfaces. In addition, the riveted joint between the camshaft timing gear and the camshaft should be checked for tightness. The camshaft should be checked for a maximum run-out of 0.0008 in. The timing gear should be checked for the correct tooth contact and for wear. If the camshaft bearing shells are worn or damaged, new shells should be fitted. The camshaft bearing shells should be installed with the tabs engaging the notches in the crankcase. It is usually a good idea to replace the bearing shells under any circumstances. Before installing the camshaft, the bearing journals and cam lobes should be generously coated with oil. When the camshaft is installed, care should be taken to ensure that the timing gear tooth marked (O) is located between the two teeth of the crankshaft timing gear marked with a center punch. The camshaft end-play is measured at the No. 3 bearing. End-play is 0.0015

Camshaft gears are marked with a -1, 0, +1, etc., along their inner face to denote how much their pitch radius deviates from the standard pitch radius of 0. If your camshaft gear has 0 pitch deviation (i.e., if it is marked on its inner face with a "0"), do not confuse this mark with the zero shaped timing mark on the outer gear face. 0.005 in. (0.04-0.12 mm) and the wear limit is 0.006 in. (0.16 mm).