Are gaskets used with Cv joints?

[autobonrun]

I finally got my old Cv joint off. There is a gasket that remained on the wheel side that looks in good shape. There is no gasket on the transmission side; metal to metal.

Is this correct? Should there be two gaskets, or is a gasket only used on the wheel side? None were shipped with my new Cv/axle combination.

Also, I don't see a difference in either end of the new part. Does it matter which end attaches to the transmission? There's no markings on it.

[Early_S_Man]

You did not say whay year model you are dealing with!

I seem to recall that post-85 models do not use gaskets, so the only question is whether an '85 model is early or late ...

But, all 911 models prior to late-'85 use gaskets on both Lobro CV-joints, inner and outer! The Schnorr washers can be reused once, but the ribs need to be sharp! To be safe, you need a complete set of Schnorr washers and Allen bolts on hand any time the CV-joints are coming off!

The CV-joints can be used on either transaxle end or wheel end, interchangably.

[autobonrun]

Originally posted by Early_S_Man
You did not say whay year model you are dealing with!

I seem to recall that post-85 models do not use gaskets, so the only question is whether an '85 model is early or late ...

But, all 911 models prior to late-'85 use gaskets on both Lobro CV-joints, inner and outer! The Schnorr washers can be reused once, but the ribs need to be sharp! To be safe, you need a complete set of Schnorr washers and Allen bolts on hand any time the CV-joints are coming off!

The CV-joints can be used on either transaxle end or wheel end, interchangably.

Thanks for the information. My car is a 79SC. I'll have to get some gaskets before I reassemble. I thought it strange that one side would have a gasket and the other not. This explains why the side without the gasket had significantly less grease. I think the mechanic that replaced my boots forgot to return the gasket.

Maybe it's normal, but I noticed that the grease on the wheel bearing side seemed to be extremely liquified when compared to the transmission side.

Whatever the cause, I'll get it right this time.

thanks again

[ohecht]

I have an 82, and there were no gaskets on the transmission side on either CV joint. The new boots came with a gasket between the boot and the CV joint, but there was nothing between the CV joint and the transmission flange.

The diagrams in the catalog and in Bentley's show only one gasket, and my only issue besides severe pitting was torn boots, so nothing was leaking.

Can anyone tell me the gasket set up on an 82? Is something a PO might have upgraded?

Thanks,

Olivier

[slider]

Olivier,
I found the same gasket arrangement with my 79 when I replaced mine a couple of weeks ago. Also noted that only one set came with the replacement boot kit and same was depicted in the Bentley. I have to tell you, to try to put on a gasket between the joint and the wheel - all while trying to line up the bolts, would seem a pretty tought task.

Joe

[Superman]

I think the gaskets are a peel-and-stick variety. They have glue on them so if the parts are clean like they should be, the gasket will stay in place during assembly. And yes, CV joints eventually grind grease into a fluid.

[ohecht]

Nothing seems to leak without the gasket between the trans flange and the joint, and they definitely were not there before, so I assume this design does not require them. The Bentley diagram also seems to confirm this.

[fredmeister]

The gaskets are a real PIA to get in place while trying to hold the cv joint in line and install the bolts. It is impossible to keep the surface clean enuff for the glue to keep them stuck in place. I don't use them in my 79 911SC joints and I don't see any leakage without them.
Just a little German over design in effect here. Nothing wrong with that, isn't it why we own a Porsche in the first place?

[Randy Webb]

Yes, they are a PIA. The question is who, are they needed and on which "versions"? Is anyone anal enough to check all the TSBs for every 911....

[BK911]

I personally use them on my street car, but I have seen many early track cars that use silicon instead. If it works at the track it should work on the street. But we pull the engine/tranny too often on the track cars, so maybe it's a long term issue?

BK

[rusnak]

I'm struggling with this now, as I'm reading many many threads on CV joints.

I have 4 gaskets and I'm considering sticking them to the CV joints, which are clean, rather than to the trans flange and wheel stub axle flange, which are dirty.

I don't know if it will work, since there is a notch or depression which seems to be made for the gasket on the flanges. It would seem that the way the car came originally was to have the gaskets applied to the flange first, then install the outside cv while lining up the bolt holes. I think you get one shot at this, then the gasket gets beat up and you have to do without.

[RoninLB]

I stopped using gaskets. No grease leak and no dirt inside.


different strokes....

[Gunter]

Like Ronin, no gaskets for me.
If the mating area of the flanges is not damaged, there should be a good seal metal to metal.
Aside from the PITA to fit them, my concern is that the torque value is affected by these gaskets.
I suspect that the incidents of the Bolts coming loose has to do with the gaskets compressing over time.
So, I clean the flanges, smear some Moly into the center of the CV's, snug the Allen bolts crosswise (180 deg) first, then apply the final torque again crosswise.
I don't use the half-moon plates but new Schnorr washers.
The CV's act like a blender and will turn the Moly into mush over time.

[rusnak]

I ended up cleaning the tranny output flanges and stub axle flanges with Brakleen, and the gaskets stayed put really well. I filled the cup of all four flanges with Valvoleen SuperSyn grease, and the boots half way with the same grease.

When I put the axles back on, I made sure that the bolts were not sticking out past a flush position with the face of the CV joint, that way I wouldn't nick the gasket and make it come off. Outside end first, then inner.

One important note: for the '84 911 you can no longer get the factory original boots. The Loebro boots are now fitted to a thinner pressed steel flange. The older ones were thicker, like a 1/4" or so. This means that you have to switch the 6 outside bolts to 45mm long rather than the 55mm ones that the car came with. I found this out when the wheels would not turn, since the bolts had locked against the inside of the wheel bearing carrier.

[jbirkett]

The parts manual indicates a gasket on both ends between the cv flange and the gearbox flange and the outer wheel flange.
John