Cracked my 915 Trans. Case.

[Toniagp]

I cracked my 73 915 trans. case,where the detent and spring are.I over tighten the bolt and it cracked.Does anyone know if this can be repaired or do I need a new case?
Thanks,Dan

[DRACO A5OG]

Oh my Gosh! Do you have a pic.

How much torque did you put on it?

BTW, Welcome sorry this is your 1st post.

[John-1977911s]

I'm sorry that happened to you.

I did this same thing when my CV broke lose and cracked the case around the detent bolt and spring.

I had 190, 000 on the trans and it was a '77 Mag case... time for action anyways I guess. I gave in a bought a rebuilt 82 SC aluminum tranny.

I can tell you that I JB welded that nut in place with the spring back in the hole. This was to make it drivable from Portland to Seattle(Remond) for the Tranny replacement.

Good Luck.

[john walker's workshop]

usually the threads just pull due to how short the bolt is. a 10mm timesert fixes that.

[Toniagp]

No it's not just the threads,she's cracked.I tried J-B weld,ultru copper on the threads,and it's still leaking.I can't find anyone who welds magnesium.Do I have to replace the case??I like my 7:31 gears so don't know what to do as far as getting another trans.?
Dan

[DRACO A5OG]

Originally Posted by Toniagp

No it's not just the threads,she's cracked.I tried J-B weld,ultru copper on the threads,and it's still leaking.I can't find anyone who welds magnesium.Do I have to replace the case??I like my 7:31 gears so don't know what to do as far as getting another trans.?
Dan

Where are you at? a Pelican Rnln knows of a guy in OC that welds magnesiam

[Toniagp]

i'm in florida.Tampa/orlando area

[Bill Douglas]

A local engineering place will know of someone.

[Toniagp]

I was told because it was porous it would be hard to weld???or was the guy incorrect?
what do you mean by engineering place?
Thank you,Dan

[euro911sc]

Call the welding supply shops in your area... they'll know who can help you.

Best regards,

Michael

[Toniagp]

If I can have it welded it would be a life saver!
Has anyone had there's welded before??

[Toniagp]

Would the trany need to come out to get it welded,if it can be welded?

[wowzer911]

A qualified welder can weld it (Magnesium alloy). My Mag. 915 had a large chunk broke off the bell housing. I talked to several shops before I found someone willing to weld it up though.
It's not a job for just any welder. They did have to try a couple of different fillers before they got it right. But it turned out great.
definitely remove it for this.

[JP911]

Originally Posted by Toniagp

Would the trany need to come out to get it welded,if it can be welded?

I would remove it to have it welded. Besides being easier for the welder to do a good job, Magnesium is flammable and if it accidentally catches on fire there's really nothing that can stop it from burning. This is one of the reasons why so few people can weld Magnesium.

[Rot 911]

You might want to try to seal it with some DOW 730 sealant. Drain the tranny, clean the crack out with some brake cleaner and seal the crack. It is fairly thick, like gasket sealer. Will not wick into the crack, but if you clean the outside of the crack, it may get the job done.

"DOW 730 SOLVENT RESISTANT SEALANT
A one part RTV paste which cures at room temp. to a tough rubbery white solid. Used for bonding, sealing and caulking where resistance to fuels, oils and solvents is required. Excellent on fuel line pipe threads, repairing fuel lines and tanks, bonding components exposed to fuels, oils & solvents. temp. range -85F to 400F. Stores refrigerated for years.
09-00383 DOW 730 SOLVENT RESIT SEALANT $93.75" http://www.aircraftspruce.com/catalog/appages/dow730.php

[Toniagp]

Found a porsche repair shop who say the can weld it for me.
Said he can do it it the car?maybe I should tell him to pull it out??
He also has a LSD he is going to sell me and install- $1300 for the LSD plus install.
Going there Fri. AM
Dan

[euro911sc]

If you are going to do the LSD then you should just pull the thing. Then you can do other engine stuff easily if needed... Welding upside down is not pleasant especially with such a delicate task as magnesium... Just a thought.

-Michael

[Toniagp]

He is asking me what I want the LSD set at 40,60,70,or 80%?
Any thoughts?I'll do a search or start a new thread.
Thank you,Dan

[RWebb]

use of car?

race only
street only
AutoX?

age of driver?
any others allowed to drive (esp. if female* or teenagers)?


Climate/Road Conditions?
- dry only
- driven in rain?
- rally use in snow/mud?

*Danica Patrick and others of similar interest do not count in this category

[Toniagp]

D.E. use - very little street use,very little rain use.
Don't know how this would be useful for ya,but just turn the big 40

1973 911 w/3.2ltr. and aa much as I try just can't get it under 2400 lbs.