1973.5 updated timing chain cover stud woes

rockreid · 06-20-2013, 06:20 AM

1973.5 CIS 911 Targa

Finally installing the updated chain tensioner kit I bought a few years ago in my restoration project. Unfortunately, on the right hand timing chain cover a small stud pulled right out trying to fasten it down. I guess I now know where the previous owner had an oil leak. Anyway, I need the know the right part number for this small stud as well as what size heli-coil kit to get to repair the timing chain housing.

Also, the left hand side cover appears to need two longer studs on top than what my stock timing chain housing has. If anyone know the proper part number for those I would appreciate it. Thanks.

Lapkritis · Lapkritis's Garage

Here's what I did to adjust my left side cover for the smaller studs.

Flat6pac · 06-20-2013, 11:01 AM

Generally, its any bolt long enough...

jrbennett · 06-20-2013, 05:49 PM

The studs are 6mm x 22mm, Porsche part number 999.062.102.02

I think the 2 longer ones are 42mm long.
I used two long bolts and cut them to length to make studs. I filled the gap in the cover with some 5/16" tubing and used a larger flat washer.

E Sully · E Sully's Garage

My tensioners were installed by a shop and they used 2-6mm x 40mm bolts.
As for the pulled stud, have you considered just re-tapping it and using an 8mm stud instead of the original 6mm?

notmytarga · notmytarga's Garage

I've been in there on my 75 and some of this isn't making sense. The bigger/longer studs on mine were for the Air Pump which I deleted with a flourish. Initially I buttoned up the covers with spacers. During tensioner install I replaced the studs with M8 shorter ones. If the stud hole is stripped something odd was done - I would tap and place an insert. Lapkritis - what did you do to the cover there - is material added?

E Sully · E Sully's Garage

It seems he drilled it out to recess the fasteners, instead of using longer ones.

Lapkritis · Lapkritis's Garage

Yeah, drilled so the regular studs were left alone on the left side. Measured intended depth and put tape on the drill bit for a visual stop. Works a treat. No fastener games.

Henry Schmidt · Henry Schmidt's Garage

Here's how we do it. Machine the excess material from all 3 bosses so the cover looks closer to the early cover. This one is a factory RS light weight. We were trying to keep it looking as original as possible and still meet the owners desire for Carrera tensioners.