Griffin951

I have an 86' 951 no major add ons just a spec stage 1 clutch and stage 2 chip set and my rear axel bolts keep finding their way out and end up getting sheared off. I'm not stupid I used plenty of the heavy duty lock tight on the treads but they still keep finding their way out. I don't know if I'm doing something wrong or if I have a greater problem causing them to find their way out but if any one has this problem or knows what to do about it I would love to know what I can do to fix this.

968 GUY

There could be grease residue in the threads.
Do a search, someone came up w/locking bolts for the CV joints.

Griffin951

Well does anyone have any suggestions as to how to put the axels in?

Van

Ideola's Garage (a 'lister) sells Stage 8 locking locking bolts. They're pretty slick.

fortysixandtwo

What are value are you torquing them to and do you know if your torque wrench is reasonably accurate?

Once fastener tension is lost, the bolts will shear off. This is because a majority of the joint strength is from the friction between the two joint faces. Also, be sure both joint faces are completely clean of debris and free of oil or grease.

Lemming

I've been using McMaster Carr 96144A215 bolts (cheap and strong) and a star washer, works great.

You can also drill the bolts and add safety wire if you want.

racerxrick

don't reuse the bolts!

User 52121

+1

AFAIK the axle bolts are torque-to-yield. Meaning they stretch when torqued and can only be used once.

Grease in the hole doesn't help either.

Safety wiring as suggested above can help keep them from backing out, too.

944V8inDFW

+1

carlege

hows that trans mount?

Griffin951

Lemming: I'm not using a toque wrench to tighten them down to a certain ft lb or in lb should I be? and if so how much?
racerxrick: Don't worry I'm not reusing the bolts lol its kinda hard to use a bolt thats been sheared in half.
carlege: What exactly do want to know?

User 52121

Um, yes.

Do a search. From memory I think it's 27 ft-lbs? But do a search.

Griffin951

Thanks Ill post up how my bolts hold up once I put my new S2 trans in

carlege

the trans mount is weak and side to side play can cause issues with cv axles.

Van

By their nature, bolts in a situation like this all like to be the same torque - that's why it's important to use a torque wrench. If they are *different torques*, vibration harmonics will set up, and bolts will start vibrating loose. You use a torque wrench on your wheels, right?