80 prop shaft mistake ?

[frank rabbets]

The 80 prop shaft can lock up if too much grease is put in the centre slider. Why is'nt there an escape hole in the centre end of the prop shaft? Unlike any other prop shaft I've seen which all have an escape hole to stop locking. Perhaps they forgot. It only needs to be a very small hole just so the excess grease squeezes out a bit like a syringe.

 

[flint]

It’s the same on the 95, I had to dig out loads of old grease from both propshafts. I just greased the splines up well before reassembling and gave it a couple of squirts for luck. I suppose a pressure relief valve could be put in instead of the nipple after greasing, but probably just best to not put too much in in the first place.

 

[clivehorridge]

Agree Frank, and the manual recommends spline greasing at 4,000 km (or is it miles) intervals, which encourages over-greasing IMO.

Best to open and clean them out before greasing, but it's too much trouble for most (including me).

If I can see fresh grease on the splines, then I don't add more grease. If they were to look dry, then I'd have them apart and re-grease accordingly.

It would have been better to incorporate an escape route, but there we are, experts in hindsight.

Mr T got so many things right on these beasts, it's hard for me to be too critical on the one or two things he seems to have overlooked.

 

[Shayne]

I grease mine then remove the nipple and do a lap down the docks which has loads of silly sized speed bumps before replacing the nipple .

 

[clivehorridge]

Good thinking that, but it's a long way to Barry Docks and back for me Shayne...

 

[frank rabbets]

The hole I referred to was to stop damage to the tranny. There are'nt any drawbacks having the hole. I don't know why Toyota didn't have one.

 

[clivehorridge]

The hole I referred to was to stop damage to the tranny. There are'nt any drawbacks having the hole. I don't know why Toyota didn't have one.

Understood Frank, and I agree. Without it and too much grease would be like hitting the tranny with a BFH all the time you're driving.

 

[frank rabbets]

Sorry Clive, didn't see you OP on this thread. I've only just remembered the UK old style props. Last time I worked on a UK rear wheel drive car was 1983 !! 1/4 of a century seams to have vanished.

 

[Jon Wildsmith]

an escape hole would fill the joint with water when wading - the factory wading depth is well above the props.

 

[clivehorridge]

On the old rear wheel drive cars I've been used to, Ford Escort mk I & II, Cortina's mk I to IV, Austins A30, 35, 40 and so on, they all had splines on the gearbox final drive output shaft, and I never remember having to grease them, ever!

Even split props with centre bearing were the same.

 

[flint]

an escape hole would fill the joint with water when wading - the factory wading depth is well above the props.

A bit excessive for a simple problem, but perhaps one of these in the right size and release pressure should hopefully stop flooding, just put the grease nipple in for servicing.

http://shop.hle.co.uk/shop/grease-n...hydraulic-straight/pressure-relief-valve.html

 

[frank rabbets]

You would think the telescoping action under water would suck water in to the prop if it had a grease relief hole. I thought the old LR's and RR's I had had a hole to let grease out but I'm not too sure now.

 

[Pumpy]

don't recall seeing a relief hole on my LR90 (dunt mean there ain't one!) grease comes out the end of splines easy enough tho

 

[clivehorridge]

You would think the telescoping action under water would suck water in to the prop if it had a grease relief hole. I thought the old LR's and RR's I had had a hole to let grease out but I'm not too sure now.

My view of this Frank is that the linear movement along the splines is very small, probably no more that a few mm. However, without the provision for movement or in a lock-up state, the impact on the T/B bearings will be significant.

Nobody wants dry splines and likewise water ingress would not be desirable, but a well greased and free moving spline is all that's needed.

I think Pete's point (above) is most people's cases, on trucks close to 20 years old, where the splines do have the ability to shed excess grease from the spline itself. When I've greased mine, fresh grease has issued from the spline proving that on compression, excess grease would come out the same way.

If the splines are brand new, the story might be different. Old grease left in may have gone hard, and that might cause a hammering effect, so the tip should be to clean the splines up, especially the receiver part to remove old and hardened grease, put back together, grease and on your way.

JMHO

 

[StarCruiser]

A bit excessive for a simple problem, but perhaps one of these in the right size and release pressure should hopefully stop flooding, just put the grease nipple in for servicing.

http://shop.hle.co.uk/shop/grease-n...hydraulic-straight/pressure-relief-valve.html

Now this to me seems like a cracking good idea. Maybe even drill and tap it in somewhere opposite the nipple.

I've generally seen grease come out of the splines after it's been running. Witnessed by a line of grease across the vehicle. It is a concern though, one that pressure relief valve would eliminate.

 

[Dave2000]

I grease mine then remove the nipple and do a lap down the docks which has loads of silly sized speed bumps before replacing the nipple .

Safe and simple idea IMO Shayne.

If I lost enough sleep over it, I would go for the pressure relief nipples that you can get for the front hubs which house the CV's.

regards

Dave

 

[Shayne]

It should be noted here (and in the owners handbook) that a brand new prop assuming it has no grease in it will likely take a full tube no problem at all so the 2 pumps guide is for general maintenance . The top end of the prop is hollow which will eventually fill making 2 pumps too much .

There is a service schedule for greasing the props every so many miles but it should include a degreasing schedule . I guess it doesn't because few trucks will still be under warranty circa 50,000 miles later .

Toyota issued a recall in Oz replacing or degreasing props for free , not sure when it happened or which model it relates to it was just something i chanced upon several times while looking for clues to my clunk .

 

[Beau]

How does grease get out from the prop, that it requires re-greasing every so often?

 

[Shayne]

In my view the grease is little more than a waterproofer to prevent corrosion and keep things moving , i suppose the outer slide part of the prop will pick up a very thin film of of broken down grease constantly ?