A Technical Question Answered

My 1987 911 Carrera has a non-working sunroof. I can hear the cables operate
but there is no movement of the insert. Any thoughts?

John Paterek: 911 sunroof cables or drives have been known to sheer off at the
cast guides. The roof remains in the locked position. You must remove the
sunroof liner insert and trip the drives with a small screwdriver or unbolt
them from the insert. The factory has superseded all drives to Carrera 2 type
(964.564.143.00 and 964.564.144.100). They have a felt covering on the cable
to reduce the noise and fit a larger diameter sunroof track. On pre-1990 911s,
the guide must be hand filed to the smaller diameter of the old track. If not,
the drives will lock in the guide. Pre-1984 911s will fail due to plastic trip
mechanisms. Try to find new-old-stock (NOS) 1984 style cables or file as
suggested by the Porsche dealer.