924Board.org

[Duncan]

Hi there,

I do not understand how to fit in my
recently obtained two point rear seat belts.
I did a search on the subject 'rear seat belt' and found a posting I didn't quite
understand.
I have two bolts in the middle console on
the rear bunk, but can not locate the position for the bolts in the wheel arches.
Do I have to puncture the carpet myself?
Is there a nut/thread where to put in the bolt hidden behind the carpet??

One picture of the rear seat belt arrangement
would be very, very helpfull.

Thanks in advance,

sincerely,
Duncan
1983 924 Alpine white

[Smoothie]

These should help. (Unless of course if you already looked at them and only got confused...) There should be threaded holes already there for the belts both under the seat and on the wheel wells.

http://www.924board.org/viewtopic.php?offset=&topic=2364&forum=7

http://www.924board.org/viewtopic.php?offset=&topic=2388&forum=1

[Smoothie]

Yes, the holes will be behind the carpet and you have to make holes.

[Lizard]

what the hell do u want back seat belts for leave them out if it isn't stock it doesn't have to have them

[Cbass]

Then you can safely transport children...

[Pat]

Did I miss something.... we have two forums for adding mostly non-stock items to our cars.
I'm curious as to if all 924's came with the rear seatbelt mountings, did any market require the rear seatbelts in the early cars (77-79), if not why did Porsche include the mounts and not offer the seatbelts until a few years into production?

[Peter_in_AU]

even back then most markets had a "if it's a seat it has to have belts" rule.

[924_fan]

USA market cars have (had) a sticker under the hood stating that the car is a two seat car. So, no seat belts in the back.

[Diesel]

I retrofitted rear seat belts in my 78. I just about cried when I punched the holes in my perfect rear seat. Make sure you get the holes right the first time, you don't want to be cutting all day to get the bolts in the right area. You can go underneath the car and locate the weld-nuts near the rear bellhousing. Use a short pick to stick up through the seat, this will get you in the right area. Also remember, beacause these weld-nuts have been in the elements for 20 years they may have some corrosion on them. Chase them with a 7/16 fine tap. They are not metric. Also, don't forget you need the proper length shoulder-bolts and spacers to install the belts and still make it look OK.

[gohim]

The threads in the rear seat bolts holes are metric.

Metric bolts come in different "pitches".

7/16" is 11mm. Metric bolts are hard to find, and even harder to find at the same diameter with different "pitches" unless you go to bolt store, a good hardware store (not the Home Depot, or Lowe's, or other kinds of stores).

Metric bolts with different "pitches" are usually marked similar to this: 11mm X 1.0, 11mm X 1.25, 11mm X 1.50, 11mm X 1.75. The higher the number, the more threads per inch (the finer the pitch).

[Smoothie]

I just took a look at one of the rear belt bolts on the wheel well. It's actually SAE (7/16 NF-20) The thread pitch doesn't match any metric size - it falls between metric 1.25 and 1.5. Hate to sound like a bitch, but just one more thing, metric pitches go the other way - the lower the number, the finer the pitch. It's the measurement in mm from one thread to the next. 11x1.0 means 11mm diameter and threads spaced 1mm apart. 11x1.75 would have threads spaced 1.75mm apart. Standard threads are in threads per inch - metric is mm per thread.

There was a spacer (metal bushing) behind the bolt I removed from the wheel well (between the seat belt and the wheel well). It's 12mm long with a 17mm OD and 11mm ID.

[gohim]

Smoothie,

You are right about the thread pitch going higher as the numbers go lower.

But, you are wrong about the size and pitch of the seat belt bolts not being metric. Some sizes work out to be crossovers between SAE and Metric, this turns out to be one of them. It appears that 7/16 X 20 is the same as 11m X 1.25. I just went out to my parts car with my tap and die set, and the size is 11mm X 1.25.

[Lizard]

hey guys chill out if it works use it it would be ovious if it wasn't the right size.

[Smoothie]

Sorry Liz, I guess that line about hating to sound like a bitch could be taken as pretty bitchy, but it really wasn't meant that way at all. My inflection was mis-taken. Oh wait, this is typed stuff - there is no inflection. We can agree to disagree and still be pals, right Mr. G?

[Lizard]

ok smoothie I just didn't want what happened with rick and gohim to happen with you. LOL

_________________
"PORSCHE There is no substitute!"

[ This Message was edited by: Lizard on 2002-08-22 09:22 ]