Thread repair in magnesium??

[chrismorse]

While the car is in the air getting new suspension, steering, brakes and fuel components, I started looking at the leaking lump in the back. I came across several nuts that don't want to tighten.
Is Helicoil the "Best" thread repair.
I have already done the block thermostat studs - After the thermostat got pushed out of the block.
The next time the engine comes out, I'd like to "tighten" things up
😀Chris

[Catorce]

Lighten it up by carefully removing the engine from the car. Then, carefully dissasemble it, while taking the magnesium case, and splitting it. Remove all internals. Then, carefully dumop the mag case in a lake.

Find an aluminum 3.0 or 3.2. In all honestly your mag case sounds worn out and past its service life.

[Jeff Alton]

Disassemble the case, send it of to Ollies or the like, have it assessed.

Report back.

Cheers

[chrismorse]

Thanks catorce and Jeff,
I know the mag case is a sub-optimal material for a street or performance engine. My dad pumped 12k into a top end overhaul, just 10 k miles and 10 years ago. About 20 years ago, he did a full rebuild, with line bore, new P&Cs etc,etc..
I am hopefull that the internals are still serviceable, while I get the rest of the car freshened.

So, to back up a bit, I am looking for the most appropriate thread repair, while I move forward, attempting to beep it running and retain the precious oil.

Thanks,
Chris

[Jeff Alton]

Depends where it is leaking. What the access is and how far you want to disassemble. Let us know the details of where the leaks are and we can go from there.

Cheers

[chrismorse]

Originally Posted by Jeff Alton

Depends where it is leaking. What the access is and how far you want to disassemble. Let us know the details of where the leaks are and we can go from there.

Cheers

Chain cover studs, bottom case seam studs, possibly strainer plate.
chris

[Catorce]

Again, why not go aluminum? Bottom seam leak almost certainly means it's warped. And yes, I own a mag case car.

[911pcars]

Chain cover studs, bottom case seam studs, possibly strainer plate.

Chain cover and strainer plate threads can be repaired w/o removing and/or rebuilding the engine. Gaskets are cheaper (if that's the leak source). If you're already conversant in Helicoil repairs, the chain box and sump cover are good locations to use. Other threaded areas may need different repair products.

Reminder that due to gravity, any oil loss from above (pressure/temp sending units, oil supply/breather lines, upper valve covers, pressurized chain tensioners, oil seals, oil filter, etc.) also appear below the engine tin. Confirm leak sources first before diving in.

Case seam studs? That requires case disassembly or an inventory of cardboard.

You decide which is more cost effective. It's your threshold of oil leakage and personal funds. A well-funded bank account can "tighten things up" considerably.

Sherwood

[chrismorse]

I wish I had an aluminum case, but need to do a compression/leak down to see if I am beating a dead horse. In the mean time I would like to tighten a few things up, fix leaks readily available.
The front mechanicals are almost done, rear suspension/brakes coming up, then the gear box, then EFI conversion/major engine work.

So, is there a better fix for the pulled threads in the mag? Keenserts, case savers, time serts, I know there are a few out there but, I've only had experience with helicoils.

Thanks, chris

[Henry Schmidt]

Originally Posted by chrismorse

I wish I had an aluminum case, but need to do a compression/leak down to see if I am beating a dead horse. In the mean time I would like to tighten a few things up, fix leaks readily available.
The front mechanicals are almost done, rear suspension/brakes coming up, then the gear box, then EFI conversion/major engine work.

So, is there a better fix for the pulled threads in the mag? Keenserts, case savers, time serts, I know there are a few out there but, I've only had experience with helicoils.

Thanks, chris

CaseSavers for head studs and Timeserts for all the rest. Very few mag cases are beyond serviceable.

"Why reuse the mag case?" matching numbers matter on these crazy collectible cars.

72S sells for $279,115.00




https://bringatrailer.com/listing/1972-porsche-911s-5/?utm_source=transactionalemail&utm_medium=email&utm_campaign=bat_watched_listing_ended

[chrismorse]

Thanks Henry, I'll give the timeserts a try.
This brings to mind an old saying about Jaguar, "The Jaguar will stop leaking oil, when it is out of oil"

[Catorce]

I don't think he actually said anything about matching numbers. If that is a consideration, you have lots of work ahead of you.

I have a better oil leak joke:

Do you know why the English don't make TVs?

Because they couldn't figure out a way to make them leak oil!

[chrismorse]

Thanks Catorce,
so, after beating up on the British, I need to relate this more worldly comparison, source unknown, paraphrasing, due to age related mental issues, "Cars are reflective of their national origin;
Italian cars, are like women, vivacious, sexy and a lot of fun to be with when they are "happy", but look out......
German cars, Porsche, et all, are perfectly engineered, efficient, reliable and, well, just machines.
English cars, like Jaguar, are beautifull, comforting. It is kind of like having a terrible fight with your wife, going out to the garage and getting in the Jag, sitting back and feeling like everything is going to be OK.

Shiny side up