drive shafts ahh that one again

[edd]

I'm at the workshop greasing my shafts .After doing a little research I'm using the correct grease .What worries me is the hydraulic effect I'm getting when the shaft goes in and out. It seems to me a air escape would help these shafts move in and out more freely . Is this something anyone has thought about.
Fitting a grease nipple seems to only give more hydraulic resistance by filling the cavity with grease . Am I applying to much grease .I'm only coating the surfaces but its acting like a air tight seal. Any help would be great
Edd

[milothedog]

The excess usually just gets pushed out at the spline end, they only need a smear of a Moly based grease CV joint grease is ideal.

Ian.

[edd]

Hi Ian , yes using the moly grease and boy is it good. Its almost too good creating a seal . I will try pumping it. It still begs the question of air entrapment in the female end. Trouble is the grease would cetrifugal its way out then and block any hole. I will call my mate Percy Vere
Edd

[DJT]

Hi Edd,

The inner end of the female section is sealed by a core plug. Some of these have a hole in the centre that would allow air to escape. It is a while since I've had to do this job (Datsun shafts fitted ) but I don't recall having the same degree of hydraulic resistance that you describe. I have a spare set of shafts in the garage, but would have to get the a Stag out to check them, and it's p***ing down again so the car is staying put......

[edd]

Cheers Dave I think that's where i'm going to locate the hole .I didn't know it was a core plug so that's really helped.
Edd

[edd]

Job done. I think this is a important mod . I drilled a 1/8 hole in the core plug and instantly you can hear the air inhaling /exhaling
I'm glad I looked into this now.
Thanks to Sam staginhidding too.
Edd

[staginhiding]

It was a Julian idea actually Edd,but thanks anyway..

Sam


QUOTE=edd;259226]Job done. I think this is a important mod . I drilled a 1/8 hole in the core plug and instantly you can hear the air inhaling /exhaling
I'm glad I looked into this now.
Thanks to Sam staginhidding too.
Edd[/QUOTE]

[Stagdad]

Job done. I think this is a important mod . I drilled a 1/8 hole in the core plug and instantly you can hear the air inhaling /exhaling
I'm glad I looked into this now.
Thanks to Sam staginhidding too.
Edd

Can it suck dirt/ water in now Edd?may be needs some sort of cover/ filter.
Cheers Steve

[edd]

Hi steve I personally don't think so its only a tiny hole. The design is flawed with no air escape and any tyoe of valve woukd jyst get blocked with grease. The current design acts like a bellows thus any quick movement ie sudden cornering that air needs to shift fast. After I drilled the hole the resustance is purley the grease and nor air pressure.
This senario will contribute to give the Stag twitch.
Edd

[jleyton]

It was a Julian idea actually Edd,but thanks anyway..

Sam

Thanks Sam and glad it's worked for you Edd.

I agree it's an important mod although some shafts I've seen have it and some don't.

I've said it before but I really wonder if it's a significant contributory factor to the Stag twitch.

The hole can be really small - I think mine were only about 1/16" - air doesn't need much to escape through.

Btw Sam - I've just found my drive shaft 'core plug' (to others, it went flying across my shed when I was trying to repeen it into place )

Cheers

Julian

[edd]

Thanks Sam and glad it's worked for you Edd.

I agree it's an important mod although some shafts I've seen have it and some don't.

I've said it before but I really wonder if it's a significant contributory factor to the Stag twitch.

The hole can be really small - I think mine were only about 1/16" - air doesn't need much to escape through.

Btw Sam - I've just found my drive shaft 'core plug' (to others, it went flying across my shed when I was trying to repeen it into place )

Cheers
ps i managed to drill the core plug in situ ie without taking the circlips and uj apart , i broke several drills but it soon went through .
Julian

Well great minds think alike. I thought of the idea ie the hole but was worried where to put it , then Sam confirmed you guys had done the same thing .I was still a tad confussed where to stick it then ian pointed out its a core plug at the end where i thought it was part of the casting. Its funy how you thought the same when it came to pushing on the splines only to have a massive air cushion. Its not a new idea i,m sure but its nice to give it some air so to speak
It's great to get some help as your working in the workshop , thanks again guys .
Edd

I,m glad this idea has had some