Propshaft assembly orientation

[Rob]

I am in the process of getting the slider replaced on my rear propshaft due to excessive play and have noticed that both UJs on the rear are in phase and on the front they are 90 degrees out of phase. So my questions is this how the props should be assembled on an 80?

I have fond a pic explaining what I mean by in phase and out of phase, please ignore the fact that one is correct and incorrect as it all depends on the application. The "correct phasing" prop is assembled in phase like my rear prop and the "incorrect phasing" prop is assembled 90 degrees out of phase like my front prop. Could someone check how they are assembled on their 80? Would be great if more than one person confirmed this as they the props can easily come apart and be put back together incorrectly.

 

[frank rabbets]

Hi Rob

My front prop is "out of phase" as per bottom diagram. It's never been apart and has the original yellow paint line across the joint.

The rear one is "in phase".

I'm amazed by this as I thought all props had to work "in phase". Prop UJ's are only constant velocity joints when in a straight line. When working at an angle the input flange is at constant speed but the tube is speeding up and slowing down so the output assy is put on at right angles to compensate, thus spinning the output flange at a constant speed. This is an "in phase" set up. Most suspensions I've worked on have had little travel but where there has been a lot of travel the axle flange is held at the same plane as the gearbox flange by the suspension design. This is also essential, as well as the propshaft being "in phase", to stop vibration. I notice on the front of the 80 the axle swivels down on a radius thus altering the planes of the flanges. Could it be that this is the reason? The rear axle flange is held in a constant plane with suspension travel. (I think but it's pouring down at the mo!).

Anyway yours appear to be correct.

What do you reckon?

Frank

 

[frank rabbets]

P.S.

The workshop manual shows the front propshaft as "out of phase" as in yours and mine.

Frank

 

[frank rabbets]

http://www.csse.monash.edu.au/~lloyd/tildeLand-Rover/LRO/prop.phase.html

We are not alone. Having worked on Range Rovers for some years I know they have a similar front axle drop. But I also found this link.

Rob it looks on mine as though the props are ever so slightly "out" from in or out of phase by perhaps 1 spline. Having read up this could be possible so very accurate marking is essential.

Frank

 

[frank rabbets]

http://trailer-bodybuilders.com/archive/what-every-shop-must-know-about-drivelines

Also produces synchro problems. Interesting!!

Frank

 

[Rob]

Looks like the front should be assembled out of phase, managed to find a pic of a genuine part: http://shop.allfourx4.com.au/epages/shop.sf/en_AU/?ObjectPath=/Shops/allfourx4/Products/37140-60350

Interesting reads, having read that I am now thinking of taking my front prop to be inspected as well as there is a small amount of play in the slip yoke. £184 + VAT does seem reasonable for a new slip yoke, front UJ assembly and balancing especially when you look at how much precision cutting and welding is involved. Need to replace the front UJ as they will replace the UJ connector to a standard external circlip design. They only use standard parts so cant use Toyota UJs on the front anymore but should be easier to find parts. Will confirm what brand of UJ they intend to use, all I know is that it is heavy duty.

 

[clivehorridge]

I am in the process of getting the slider replaced on my rear propshaft due to excessive play and have noticed that both UJs on the rear are in phase and on the front they are 90 degrees out of phase. So my questions is this how the props should be assembled on an 80?

I have fond a pic explaining what I mean by in phase and out of phase, please ignore the fact that one is correct and incorrect as it all depends on the application. The "correct phasing" prop is assembled in phase like my rear prop and the "incorrect phasing" prop is assembled 90 degrees out of phase like my front prop. Could someone check how they are assembled on their 80? Would be great if more than one person confirmed this as they the props can easily come apart and be put back together incorrectly.

View attachment 7753

As my 80 is in for a facelift, I can't advise on the phasing of the prop shafts front and rear and I have no certain knowledge of the subject.

From a common sense point of view, I would have thought the top diagram "in phase" would be correct in all circumstances. However, from the above posts, it may be that my sense is not so common after all!

One thing I did notice is that the diagram appears by its wording, to relate to steering column shaft assemblies as opposed to drive or propeller shaft configurations.

I really don't know if my observation is relevant or not.

Interesting topic though.

 

[Rob]

Clive, I was told by the propshaft place that they are sometimes installed out of phase when the joint angles are large like on a short front shaft.

Sent from my GT-I9505 using Tapatalk 4 Beta

 

[clivehorridge]

Maybe, but the logic of that is beyond me!

I'll have a look at my props when I pay a visit to the paint shop tomorrow.

 

[Bat21]

Had my 80 MOTd today, which he passed with no advisories.

After reading this post the other day, I thought I would have a look at my rear prop while it was on the ramp as I had to remove it while fitting the rear ARB locker. It is neither in phase or out of phase, I would say it is about 2 or 3 splines out from being in phase.

If this phasing was critical, surely Mr T would have produced these slip joints with a master spline arrangement?

 

[clivehorridge]

Had my 80 MOTd today, which he passed with no advisories.

After reading this post the other day, I thought I would have a look at my rear prop while it was on the ramp as I had to remove it while fitting the rear ARB locker. It is neither in phase or out of phase, I would say it is about 2 or 3 splines out from being in phase.

If this phasing was critical, surely Mr T would have produced these slip joints with a master spline arrangement?

That's also an interesting observation.

I still haven't checked mine, I worked late last night and couldn't get to the workshop to have a look. Maybe this evening....

 

[Rob]

Paul, that is probably a sign that the rear prop has been apart at some stage. I would assemble it back in phase and get it balanced just in case.

Sent from my GT-I9505 using Tapatalk 4 Beta

 

[Bat21]

.... I had to remove it while fitting the rear ARB locker....

Paul, that is probably a sign that the rear prop has been apart at some stage. I would assemble it back in phase and get it balanced just in case.

Yes I removed it to fit the ARB locker.... while doing so I slipped it out of the sliding yolk. When resembling I didn't know about this phase thing so just slid it back together.... but now having looked today it is clearly 2 or 3 splines out.

I can't work out why Toyota didn't make the slip joint with a master spline if it mattered that much

 

[Bat21]

.... I would assemble it back in phase and get it balanced just in case.

Okay, so I have just got under the 80 and set the rear prop in phase.

had a quick look at the front prop (which I forgot to look at yesterday) and that too is in phase

 

[clivehorridge]

I kept forgetting to look, too excited about the facelift and how shiny and one colour the car.... Sorry, and after climbing under with a torch, both front and rear props are exactly in phase.

Looks like we're going to get every combination from the members, maybe we should have a poll?

 

[joinerman]

We love pictures Clive !!!!!

 

[Paul_Humphreys]

Have never looked at mine, they work and I have marked both with a centre pop mark. They always go back the same way and still work ok.

 

[clivehorridge]

We love pictures Clive !!!!!

Pictures of props in phase, or the shiny new facelift? Too dark for prop shaft photos, but the "keep it under wraps" thread has some "shiny" pictures!

 

[joinerman]

Agh yes must pay more attention.

Looks good Clive.

 

[clivehorridge]

Agh yes must pay more attention.

Looks good Clive.

Thanks! We'll see in a year or two!

Maybe less if Shayne is right, but I'm hoping for more than 5 minutes Shayne!!