Remove CV Joints - 12 Point Size? - Carrera

[AvonGil]

I jacked the car up yesterday and started to replace my torn boot only to find out that the 8mm 12 point was too small. I quickly ordered up a 10mm 12 point. Is this the correct size? Or did I assume incorectly?

[Gunter]

10 mm sounds large.
On my SC, the bolts have an 8 mm thread and a 6-point Allen head.
Some SC's may have a 12-point.
Do a search for Carrera CV joints; to replace them requires removing the big nut (210 ft-lb!) from the rear wheel. You'll need a 3/4" drive socket for that one, a 1/2" will not do it!

[AvonGil]

I have all the required tools except for the 12 point. As stated above, the 8mm 12 point is too small. Its most likley a 10, but I jsut want to verify that. SCs are diffrent, they use M8 bots, Carreras have M10 bolts.

[cbeers]

Double check that torque value on the axle nut, I seem to recall it being more like 325lb/ft. I bought a big impact and it did the trick for removal. When I tightened it up with the impact, I was VERY close to proper torque. Just a little nudge with a big torgue wrench to verify and I have been good for almost 2 years now.

Check your inner bolts on the tranny flange after installation, they have been known to come loose......

-Chris

[Jim Sims]

Check your local auto parts store; many have the the triple square (12 point) sets up through 12 mm size. The prices are very reasonable and the strength/wear didn't seem much different from the Snap-On bits.

[Gunter]

Chris:
The SC Bentley calls for 300-320 Nm (217-231 ft-lb) for an M20 nut.
It may be similar on the Carreras.
Avon: If Carreras have M10 bolts (Meaning 10 mm threads) then I doubt it is an 10 mm Allen hex-head; let us know what you find.

Carreras had 8 mm bolts in the first few years (With a smaller CV joint) They changed to a larger size around 1985.

Thanks, Wil

[Wil Ferch]

Carrera's changed over from 8 mm to 10mm around 1985....within the model year production run....

Wil

[rcecale]

AvonGil,

Loads of useful information from some well informed individuals in this thread on Reconditioning Constant Velocity Joints.

Randy

[cbeers]

Gunter,

See this thread for Carrera torque info, straight from John Walker. Confirmed with my Carrera Bentley.

Well, the oil change went well.........



However, the impact that I got DID in fact remove and reassemble the axle nut. Like I said, just a quick nudge with a proper torque wrench and all was good


-Chris

[AvonGil]

It is a 10 mm 12 point.

[Gunter]

10mm-12point Allen with new Schnorr washers should be good for another 10 years.
Wow! 320# ?? What size nut is that?
On an SC, the nut is given as 20mm and 230# torque maximum.
How much bigger is it on a Carrera?
What is the thread size on a Carrera stub axle?

Thanks.

[KTL]

The nut on the later (85.5 and up) axle is a big 'ol M22 x 1.5 self locking nut that is torqued to 460 Nm = 340 ft-lb (460 x 0.7375 = 339 and change)

I don't recall what the nut size is. I think it's 32mm

[cbeers]

Yeah, it's a big one. My old IR impact had no chance. that's why I went out and got the 450# impact

I think the nut is either something like 30-34mm, can't recall at the moment. The main thing is getting access to a torque wrench for proper tightening. I just drove it to my wrench with the center cap off the wheel and he snugged it up for me!

-Chris

[AvonGil]

Originally posted by KTL
The nut on the later (85.5 and up) axle is a big 'ol M22 x 1.5 self locking nut that is torqued to 460 Nm = 340 ft-lb (460 x 0.7375 = 339 and change)

I don't recall what the nut size is. I think it's 32mm

Nope. Its a 32 mm nut.

[Gunter]

Nuts, nuts, nuts:
On any nut, the thread is the determining factor for torque values.
So, when the nut size is given as M22 x 1.5 mm, it means the nut will fit a bolt with 22 mm diameter and a 1.5 mm pitch.
The socket size for the hex is a different matter but has nothing to do with torque settings.
KTL was correct with the nut-size.
AvonGil: When you say: "Nope. Its a 32 mm nut", you surely mean the socket size, which doesn't help and is confusing.
But socket-size is NOT used when ordering, or describing, any nuts; the thread dimension is the important factor.
Cheers.

[AvonGil]

Sorry you are correct. It requiers a 32mm socket.