There have been a number of documented failures relating to the Variocam mechanism fitted to the Porsche 968. Porsche has not published any periodic inspection or maintenance requirements for the Variocam. Halfway along the length of each camshaft is a toothed sprocket and a connecting chain that transfers drive to the intake camshaft from the engine driven exhaust camshaft.
Earlier variants of Porsche’s 16 valve engines (2.5 liter 944S and 3.0 liter 944S2) used a similar setup but without the Variocam mechanism. Possible Causes of Variocam Failure. Tensioner pads 1 mm (max deepness of tracks in the nylon pads) Camshaft chain 2mm (half stretching of the closed chain, corresponds to 4mm of stretching of an “open” chain). The chain stretching can be measured easily and precisely only by dismounting the old chain (requiring removal of both camshafts) and comparing it with a new one. The effects of a stretched chain, are easily visible on sprocket wear patterns. Suggested maintenance schedule. Unknown or
greater than 60,000 Unknown or greater than 100,000 Immediately inspect the Variocam, following the procedure above. See also the section above regarding “wear limits”.
Tags : porsche 968, 968 porsche, valve engines, 944s, maintenance schedule, camshaft, deepness, maintenance requirements, camshafts, sprocket, liter, porsche, nylon, failure
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