944 CV joints..sides or ends..any difference?
- Thread starter Axl Rose
- Start date
George Elliott
New member
Like Dave, cleaned & repacked cv's. 128k miles - the grease had gone "dry" no bother since.
George
944t
964
George
944t
964
The four CV's are the same part number, and hence a replacement can be fitted to the inside or the outside.
The CV's can also (theoretically) be fitted either way 'round (i.e. slid onto the shaft from either side of the new part), but when I replaced all of mine a while back then the new parts were not symetrical and fitted down onto the splines much better one way than the other. (The first one went fine, the second one was fitted the 'other way', and caused a load of grief, the third and fourth were done the same way around as the first one and also worked fine.) My advice would be to fit the new CV carefully, and tap it GENTLY into place. If it doesn't sit down enough to fit the circlip on the end of the driveshaft then take it off and re-fit it the other way. DON'T wallop it with a hammer to make it fit - this way lies tears.
As far as rotating the driveshaft to drive the CV's 'backwards' (i.e. on the other face) then this only works if you swap the driveshafts from one side to the other. (Look carefully at the way the drive works, and think about it with a pencil and paper for a few minutes. You'll see what I mean.)
Repacking joints can quieten a noisy one, but is messy. DON'T (as I did) hear a noise from the back of the car, assume it is CV's and replace them, only to find out that the noise is something else ...
Oli.
The CV's can also (theoretically) be fitted either way 'round (i.e. slid onto the shaft from either side of the new part), but when I replaced all of mine a while back then the new parts were not symetrical and fitted down onto the splines much better one way than the other. (The first one went fine, the second one was fitted the 'other way', and caused a load of grief, the third and fourth were done the same way around as the first one and also worked fine.) My advice would be to fit the new CV carefully, and tap it GENTLY into place. If it doesn't sit down enough to fit the circlip on the end of the driveshaft then take it off and re-fit it the other way. DON'T wallop it with a hammer to make it fit - this way lies tears.
As far as rotating the driveshaft to drive the CV's 'backwards' (i.e. on the other face) then this only works if you swap the driveshafts from one side to the other. (Look carefully at the way the drive works, and think about it with a pencil and paper for a few minutes. You'll see what I mean.)
Repacking joints can quieten a noisy one, but is messy. DON'T (as I did) hear a noise from the back of the car, assume it is CV's and replace them, only to find out that the noise is something else ...
Oli.
Interesting challenge - please do have a look at my logic, but bear in mind that the drive from the gearbox is to the outer part of the inner CV, and the drive to the wheels is from the outer part of the outer CV, and then think about which face of which joint is driving, and then I think you will come to the same conclusion as me. (Assuming that you haven't removed the CV's from the driveshaft and changed them around independantly.)ORIGINAL: berg944
[X(][X(][X(][X(].........errrrmmmmmm..........NO[]
Mike[:'(]
Oli.
Mike,
Sure, but we aren't talking about wheels here.
Think about the drive on the inside CV (from the gearbox to the driveshaft). This drives from the outer part of the CV to the inner part of the CV, via the ball bearings. Think about which face is therefore going to transmit the drive on both the outer and inner part of that CV.
Now imagine the same driveshaft rotated so that it's the other way 'round. The same CV will be driven from the inside (from the driveshaft) to the outside (the wheel hub) the other way.
This drive is using the same drive faces as in the first scenario. Therefore swapping the driveshaft won't have made any difference.
However, now think about swapping the two driveshafts from one side to the other. That does make a difference to the drive faces.
(I have realised an error in my earlier post which I have now corrected.)
Oli.
Sure, but we aren't talking about wheels here.
Think about the drive on the inside CV (from the gearbox to the driveshaft). This drives from the outer part of the CV to the inner part of the CV, via the ball bearings. Think about which face is therefore going to transmit the drive on both the outer and inner part of that CV.
Now imagine the same driveshaft rotated so that it's the other way 'round. The same CV will be driven from the inside (from the driveshaft) to the outside (the wheel hub) the other way.
This drive is using the same drive faces as in the first scenario. Therefore swapping the driveshaft won't have made any difference.
However, now think about swapping the two driveshafts from one side to the other. That does make a difference to the drive faces.
(I have realised an error in my earlier post which I have now corrected.)
Oli.
Don't be confused ... in answer to your original question then you can buy new CV's and fit them to either end of either shaft, and if you swap the shafts from side to side it will help as well. Clean and re-pack the two you leave on if you wish.
FWIW, I am told that the CV most likely to suffer is the one nearest the exhaust as it gets hotter than the rest. Maybe this should be one of the two you change.
Oli.
I agree with Oli, the only way to change the faces that transmit the load is to swap the shafts from one side to the other. Turning them around on the same side will make no difference except for a small change to the angle of articulation if the planes of the wheel and and gearbox output shaft are not parallel.
Thanks for confirming ... I *thought* this was the case but wasn't 100%.
If the gearbox drive plane and the wheel axle plane are not the same then you probably have other problems to contend with than a slightly worn CV. But any difference must by definition be compensated for the other way on the other side (or else you have real tracking problems.)
Oli.
Posts made and opinions expressed are those of the individual forum members
Use of the Forum is subject to the Terms and Conditions
