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Porsche has not published any periodic inspection or maintenance requirements for the Variocam. Consequently even cars with a full Porsche main dealer service history may suffer undetected excessive wear or even catastrophic failures. Purpose and Scope : The purpose of this procedure is to describe a method for home inspection of the camshaft sprockets, cam chain, and Variocam chain tensioner pads. The procedure does not include any necessary repair work that may be necessary as a result of the inspection findings. Variocam is a mechanism that allows the intake camshaft timing to be varied for different engine operating conditions, thereby maximizing torque. In the 968 engine, the exhaust camshaft is driven by a toothed rubber belt from the crankshaft. 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. Instead, they used a simple spring and hydraulic operated chain tensioner whose purpose was simply to maintain constant chain tension. Possible Causes of Variocam Failure : Aging of the plastic pads (rails). With time and miles, the pads became much more brittle than when new, leading to an increased chance of breakage, and in any case to an increased rate of wear. Inspection Procedure: Remove four hexagon socket head screws securing aluminium trim panel over cam cover/fuel rail, remove “Variocam” badge and trim panel. Pull out spark plug caps/leads and remove spark plugs. Substitute both camshaft with new ones. This is a costly option, but gives you at least 60,000 miles, and following the maintenance many more ?, of trouble free Variocam functioning
Tags : camshaft sprockets, necessary repair work, plug caps, head screws, chain tension, porsche 968, costly option, valve engines, 944s, rubber belt, catastrophic failures, chain tensioner, cam chain, inspection findings, socket head
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