chamilka

I'd like to install the front undertray on my 1988 Porsche 988 S4, but I'm struggling to recall the exact process. I've got a collection of hardware, but the factory diagram isn't comprehensive enough. Any diagrams or pictures you could provide would be greatly appreciated.

picture-1 front undertray/belly pan - this is a stock picture but my one is original to the car with scoops.

Picture-2 hardware removed from the car


Picture -2: two Strang looking washes with bolts. I think I need three? one missing .

Mrmerlin

Last picture those 2 bolts hold the fingers of the spoiler to the frame rails the washers let it float

the 3 bent spring metal tabs are for the rear edge of the spoiler and attach under the lower radiator support they hold the rear edge of the spoiler and the front edge of the belly pan
one on either end and one in the middle though you might be missing one of the spring tabs

their are 2 hidden screws they hold the air ducts to the cross member look through the round holes use a flashlight to look through the Louvers to line up these screws

chamilka

Thank you kindly, Let me try to fit it with your information to see if I can figure it out.

PC-85-928S

chamilka

you are the best, thank you!!

worf928

Undertray is one of those areas where PET is wrong. All of the course thread fasteners that secure the undertray (not the hangers) are the “captive washer” type not the separate screw and washer.

All undertray fasteners are the course thread type with the exception of the two that bolt to the steering rack guard. Those two are M6 1.00 pitch with an M6 fender washer.

Don’t succumb to the temptation to use oversize washers all over the place to “prevent” the undertray from getting ripped off. That’s like putting a 30A fuse in a 5A circuit.