myflat6

Curious to see what we find...
If using the mobile app - see poll option above

Dave Inc.

Mine went somewhere between 120,000 and 125,000 miles and 34-35 years. Just one stud on the lower right side (#4 I think) and it fell off in my hand as soon as I opened my valve covers for valve adjustment.

theiceman

eeny meany miny and Moe .. Moe Money more like it .


The Dilivar Gang are no more in my engine , their reign of tyrany is over !!
Mine did it at 260k km , as Dave mentioned I could hear a metal on metal tapping as I drove. I took valve cover off and it fell into my hand. By the time I got the engine out and on to the stand and rotated, 3 more fell out. All lowers all Dilivar, replaced with steel.

BoomC2S

Mine went with 76000 miles and this was last year. Had one broken on each side.

myflat6

thanks for the responses everyone - bumping this thread to keep visibility and the hopes of getting more data

theiceman

Its worth pointing out that this is not a catastrophic failure. One breaks. Start budgeting to have the top in end done.
Unlike an IMS failure of a more modern porsche. Immediately take your wallet out to buy a new engine . Or scrap your car

sithot

The 3.0 and 3.2 all break sooner or later. I won't look at any car that hasn't had studs replaced. The last 2 SC's I owned had new studs. One was an original 55K car. Time, not mileage in this case.
Stress risers on the studs created by corrosion.
Here are some from a '69 Group 3 Porsche factory engine. Every one of them broke. The "covers" held moisture. Moisture = Corrosion. Heat cycling did the rest.

myflat6

Interesting results so far, although we only have 17 responses. I find it interesting that even though these cars are now 35 to 40 years old, some cars have not suffered this failure. It may happen to all of them at some point, but some have held up for several decades now. Wonder if mileage, heat/cool cycles/temps and/or moisture have something to do with it?

sithot

I've seen low mile cars (30K) with broken studs that were kept up quite well. These studs corroded, created stress risers and snapped. No rhyme or reason but until a seller can prove the studs in a car
are replaced I'm not a buyer. It's not a matter of if.

theiceman

I kept my old ones as proof , coz its really hard to check.

Gadsby

old man neri

I haven't looked much into it but I am assuming proactively replacing them costs just as much time and money as replacing them once one breaks?

sithot

Do once and forget about them. All of these engines need a top end by now so it's as good an excuse as any.

theiceman

Yes you are correct.

old man neri

Well, I just looked up a top end rebuilt receipt from about 15 years ago. It included new nuts but not new studs. Looks like this may be in my future.