Interior
Technical Information and Restoration Parts for the 928

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Interior (Max 150 Points)

For a fine luxury automobile, the durability of the 928 interior is one of its weakest points.  Porsche prior to the 928 had been known for Spartan interiors preferring to concentrate on performance.  The 928 and SC were the first Porsches with plush and well appointed interiors.  In an attempt to keep weigh down Porsche relied heavily on light weight materials including plastic.  Perhaps the weakest point of the entire car is the large number of plastic parts used.  These over time deteriorate and the interior having the highest concentration of plastic suffers the most.

bulletDash - The dash side arm rests and pod are all injection molded.  Porsche had problems with the early injection parts with a high number of rejects. Creatively they solved the problem by covering the rejects with leather offering a full leather interior.  The dash and pod are are subject to cracks and are expensive to replace.  Often these are covered with covers to hide the cracks.   
(Deduct 20 points for a cracked dash and Pod.  Deduct and additional 10 points if the dash is leather and damaged.  Add 10 points for a perfect leather dash)
bulletGlove Box - The glove box has a plastic hinge and plastic stops that can break.  The interior frocking can get dirty and messed up.  If leather, the cover can peel and shrink.  It is not uncommon for stereo equipment to be mounted in the glove box and for holes to be cut in the back. 
(Deduct 7 points for a bad glove box)
bulletStorage Trays - On the older models there was one storage tray on the passenger side.  On the later models a storage tray was added to the drivers side as well.  These are made of plastic and can break or be cut up for stereo equipment. 
(Deduct 3 points for each missing or damaged storage trays)
bulletDoor panels - Window rattles and lock problems make the door panels frequent targets for removal.  The panels are protected by a vapor barrier of plastic.  Often when the doors are worked on the vapor barrier is destroyed when removed and never put back on.  This causes moisture to soak into the back of the door panel and cause warping and deterioration.  The lower portion of the door panel is covered with carpet which can hide the deterioration.  The panel should be check closely for extra screws, warping and deterioration.  The arm rest is a separate part of the door panel.  The arm rest is made on a plastic base and injection molded.  It is held in place by four bolts through plastic tabs behind the arm rest and one bolt inside the air vent.  It is very common for the plastic tabs to be broken.  Often attempts are made to reinforce the tabs with washers.  Unfortunately, when one tab breaks it puts more pressure on the other tabs causing them to fail as well.  A portion of the arm rest folds out and accts as an extended arm rest and access to a storage compartment.  The compartment has texture - frocking - on the inside that can also wear and look bad over time.  The arm rest has hinges that can break or come loose.  There are a number of small plastic parts covering the bolt and arm rest release that often get misplaced. The arm rests can also be covered with leather.  
(Deduct up to 10 points for each damaged door panel.  Add 5 points for leather arm rest in excellent condition)
bulletWindow Tracks - While not specifically an interior item the window tracks should be checked at this point.  The window runners are made of plastic and easily wear after a few miles.  Put the door window down half way and try to rattle or move it.  If it is loose the plastic tracks need to be replaced.
(Deduct 5 points for each window that is loose)
bulletCenter console -  The center console is secured to the dash and behind the shifter.  It is very common for the rear attachment points to break.  Other common areas of wear are the shifter, the boot on the shifter of the 5 speed and the plastic guide on the automatics, knobs on the ventilation system, the housing for the temperature sensor and the rear portion of the console.  The optional center armrest is attached with a plastic hinge that breaks.  The inside of the arm rest also ages with time and often needs to be relined.  It can also be crushed when used as a seat.  The rear center console has one of three options - a glove box with a separate key lock, no glove box and optionally a rear air conditioner.  
(Deduct up to 15 points for damage to any parts of the center console.  Add 5 points for leather in excellent condition)
bulletCarpets - The 928 has carpeting that is held in position with snaps and hold downs and is backed with foam padding for a luxurious feel and appearance.  The backing foam and padding can deteriorate with time and use - the same with the hold downs.  The carpet should be inspected closely for wear, fading or missing components.  A caring owner will also provide floor mats to protect the carpet.  Faded carpets can be dyed for a savings.  (Deduct up 15 points for bad or worn carpeting)
bulletSeats -  Porsche offer a choice between fabric and leather seats.  By far the preference is for leather seats.  Some of the early fabric combinations can be dated - but have appeal from a collectors stand point.  The rear seats fold down for extra cargo space.  The release mechanism can break or jam.  The front seats usually wear in the drivers side bolster and the seams of passenger side lower seat bottom.  Since it is common for the car not to have a passenger the passenger seat is more prone to sun damage.  Look for discolored and dry leather.  Often leather seats that appear to be in bad condition can be restored provided they are not torn or completely destroyed.  Leather can be reconditioned, soften and re-dyed.  This is a time consuming process and recovering may be a better option.  
(Deduct 50 points for bad front seats and 30 points for bad rear seats.  Add 20 points for leather seats in excellent condition)
bulletMiscellaneous - There a number of covers, knobs and switches all of which can cost money and take time to replace.  The sliders on the ventilation system are very common to be broken.  
(Deduct 1 point for each broken knob, switch or door handle)

Rear hatch Area 

bulletUpholstery - The upholstery around the rear windows will peal and shrink over time.  It is very common for the rear inside quarter panels to warp severely.
(Deduct 10 points for severely damaged rear quarter panels.  Add 5 points for rear quarter panels with leather in excellent condition)
bulletTool Kit - The back of the car contains a tool kit.  The latch for the tool kit can break as well as the plastic tool tray on the inside.  Often most or all of the tools are missing.  
(Deduct 3 points for missing tools or damaged tool kit) 
bulletSpare Tire - The collapsible spare is stored under the rear carpet.  The cover to the spare is made of clear plastic and backed with foam.  There should be a jack, air pump, plastic bag and gloves with the spare.  Inspect the remaining trend on the spare.  Somewhere in the country there is a ware house full of spare tires and air pumps for the 928 as it is not uncommon for them not to be included with the car - especially if it has passed through a dealers hands.  Test the air pump by plugging into the cigarette lighter.  
(Deduct 2 points for a missing jack or air pump. Deduct 5 points for a missing or worn out spare.  Deduct 3 point for a missing or damaged spare cover)
bulletStorage Cover - The rear hatch area has a variety of different covers options.  These can vary from a snap on cover to an automatic cover that operates with the rear hatch.  Nets are often provided.  
(Deduct 5 points for a missing or damaged rear compartment cover.  Add 3 points for a folding cover that operates with the hatch in excellent shape.)
bulletHeadliner and Sunroof -  The motor for the sun roof is under the rear clip on panel.  It is not uncommon for the sun roof head liner to be torn or the motor panel to be loose.  Inspect the sun visors for cracks and tears.  A garage door opener clip can cause permanent damage to a sun visor.  
(Deduct up to 10 points for a damaged headliner or missing parts.)

 

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