5 replies to this topic

[The_Doctor]

Hi there,

 

Just wondering if the grease used for outer cv joints can be used on the inner cv joints? If so, should the existing grease be removed or can the new outer cv grease just be added to what's already there?

 

Cheers

[nicklouse]

yes.

 

depends if you have contaminated it.

 

if you have then yes. if it is very old then yes.

[tiger99]

You have to use the same stuff now as the originally different grease for the inner joints is no longer available. Clean them out fully first. Different brands of grease do not necessarily mix safely. They sometimes decompose to a watery mess.

I recently found a source of proper Molybentone in quantities larger than the usual sachet. I am on the phone now and when I get home will try to find the link. A tin of the proper stuff would be very useful.

Don't use plain "moly" as has been wrongly suggested in the past, or even worse, the similar looking and in this application utterly unsuitable graphite grease.

[tiger99]

Here you go:

 

http://www.molyslip....ucts.php?cat=52

 

Molyslip MBG appears to be a good replacement for the original, and should be ok in both inner and outer joints, and the sliding splines of earlier cars. I would advise not using it in the wheel bearings and nipples without researching its suitability. These usually require a Lithium based grease, rather than Bentonite.

[Spider]

Don't over fill them either!

[tiger99]

Yes, very important! The usual practice is to fully and thoroughly pack the cage assembly and ball slots (take your time and use a clean nitrile glove to work it in with your fingers), for both hubs and CVs, and put some spare inside the CV or between races on a hub, leaving plenty, at least 75%, of air space. Never in the CV gaiter or the hub dust cap.

Too much and when it warms up it expands and forces it's way past the seals, which can contaminate the brakes, and it may cause overheating.

I always grease the splines of the CV for the drive shaft, as it is a loose fit and moves slightly under load. You don't lubricate splines where the parts are clamped together by tightening to an enormous torque, like the CV to hub flange. Perhaps a little bit of copper grease (not for moving parts as it is not a high performance lubricant) could be used to ensure that they will come apart again.