On a 968 944 s2 or 928 four cam engine, when doing the timing belt do not disturb the 30mm wrench size nut on the cam gear or the 10mm 12 point bolt on the end of the cam wheel as that will disengage the sprocket from the cam and allow the timing to be off by several degrees. Although there is a key way for this gear there is slop in it for fine adjustments.

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