Difference between moly grease and molybdenum paste?

[marlinspike]

We are working ouselves up to replacing the full clutch and the slave cylinder in my Saab c900 1992. It's a bit daunting as getting the old ones out was a nightmare.
In the online guides by folk who have done it on their own cars, there is either no mention of greasing the clutch spines where it meets the release bearing, or a couple who mention using moly grease. The Saab service manual seems to say molybdenum paste. Is there any difference between the two? One's in grease form, one's a paste obviously. The grease is easily, and quite cheaply, available. The paste is expensive and would be internet only.

Any thoughts?

 

[Ashley Burton]

https://aftermarket.zf.com/go/en/sa...-tips/clutch-systems/greasing-the-hub-spline/

 

[grim_d]

In instances where grease is not supplied I've always used anti seize compounds.

Anything that is slidey, doesn't melt at engine temps and stops corrosion will work fine.

Molybdenum paste is used to lubricate the root of the fan blades on some jet engines so it is good stuff, it doesn't get flung like grease and is good for high temperatures. Messy, messy stuff though.

 

[Gareth J]

The paste has a higher moly content and, is supposed to stick around longer.

Was recommended to be used on the clutch/driveshaft splines on a BMW bike I had.

Expensive for the size of pot but you use very little and is surprising how often I go to what's left.

 

[Matchless]

we always used copper grease but I suspect very little was left after a week of 5000 rpm...…...

 

[mr haynes]

Clutch kits usually come with a little sachet, be more than enough.
Clutch replacement on c900 is pretty straightforward compared to "normal" cars, just remember to tighten all the bolts into flywheel

Edit: You will be using a Sachs kit so grease sachet will be present. See @Ashley Burton link posted above

 

[johnik]

as above ^^, usually some red grease designed for the job, i think it,s the same as brake grease

 

[grim_d]

as above ^^, usually some red grease designed for the job, i think it,s the same as brake grease

"Red rubber grease" an excellent all rounder, nice and thick and doesn't attack rubbers

 

[Seadog]

I've had my tin of Castrol Rubber Red since the late 70s. It still gets used from time to time.

 

[Robotstar5]

I've had my tin of Castrol Rubber Red since the late 70s. It still gets used from time to time.

As I was passing I popped into Halfords on the offchance they might stock it. One of the staff asked what I was looking for so told him, then he asked what I needed it for so I told him it was for lubing caliper seals, "oh no sir, you need copaslip" I bought some off t'interweb.

 

[Seadog]

A little knowledge...

 

[marlinspike]

Thanks for the ideas and info. My clutch is a Sachs one - no sachet of grease was present though. That video was very helpful - I get now why it has to be special grease. You can buy the Sachs grease it seems but it's expensive. Will continue the research.

 

[mr haynes]

Thanks for the ideas and info. My clutch is a Sachs one - no sachet of grease was present though. That video was very helpful - I get now why it has to be special grease. You can buy the Sachs grease it seems but it's expensive. Will continue the research.

Speak to your supplier, as said all sachs kits should come with it

 

[marlinspike]

The supplier was GSF but I bought the clutch 8 months ago, so a bit late to go back.

Presuming I could use the Sachs grease for other stuff? I might bite the bullet and get a tube from Amazon.

There are several other 'UK' suppliers selling it at under a fiver, but when you click through they might appear to be different sites but are really all variants of Autodoc - and postage is £8.50. I have heard of them ringing people up when they put stuff in their basket but didn't follow through and buy lol.

 

[grim_d]

You are overcomplicating it.

 

[marlinspike]

I possibly am but the clutch removal was a nightmare and I never want to have to touch it again.....

 

[mr haynes]

Unless your input shaft is bone dry you'll be fine using what's already there.
It's barely a smear of grease used

Speak nicely to Sachs customer services, explain your position and they'll probably send you a sachet

 

[mr haynes]

I presume you already have a spring shim spacer thingy...

 

[marlinspike]

Well, guess what? I was moaning to OH about it and he went off to search for the mystery sachet and found it. Good job we don't tidy up much. I don't recall seeing it when I opened the box, though I might have forgotten, so I probably dropped it or it fell out of the box when I first unpacked it last September.

What a great forum this is though - I would never have known the grease sachet should be with the clutch if it wasn't for you guys. It wasn't on the product listing or photos. Thanks again all.

 

[grim_d]

Well, guess what? I was moaning to OH about it and he went off to search for the mystery sachet and found it. Good job we don't tidy up much. I don't recall seeing it when I opened the box, though I might have forgotten, so I probably dropped it or it fell out of the box when I first unpacked it last September.

What a great forum this is though - I would never have known the grease sachet should be with the clutch if it wasn't for you guys. It wasn't on the product listing or photos. Thanks again all.

To be fair it's only the more premium brands that include it, like sachs, intact I'm sure I have a sachet of Sachs grease in my bits box.