In phase or out of phase? (1 Viewer)

[ashooter]

1992 FJ80 -

I'm getting conflicting info here. Most of the stuff I read says that the front driveshaft should have the u-joints 90 degrees out of phase... But, then a coupld of guys chimed in and said that's only for FZJ80's - FJ80's are supposed to have them IN PHASE.

Which is right?

 

[ashooter]

Hmm... Look at the dust cover in that illustration. It looks like the shorter dustcover shown for the rear driveshaft in the other FSM illus. I've seen here (which I assume is for a FZJ80). But, looking at the nuts vs. bolts at the rear flange yoke, this has got to be the front driveshaft.

My dustcover on the front driveshaft is definitely different (longer, with a stepdown in the middle) than the one shown here.

I'll probably just put it back the way I got it out - in phase. Though I wonder if it would be better off 90 degrees out of phase.

 

[alia176]

On the same note, can the dust cover be removed in order to clean the splines? If so, is it simply tapped out?

Thanks.

 

[OGBeno]

Hmm... Look at the dust cover in that illustration. It looks like the shorter dustcover shown for the rear driveshaft in the other FSM illus. I've seen here (which I assume is for a FZJ80). But, looking at the nuts vs. bolts at the rear flange yoke, this has got to be the front driveshaft.

My dustcover on the front driveshaft is definitely different (longer, with a stepdown in the middle) than the one shown here.

I'll probably just put it back the way I got it out - in phase. Though I wonder if it would be better off 90 degrees out of phase.

That schematic is from a 92 FSM. I got it specifically for your rig to answer your question!! This is also the front drive shaft.

Do not put it out of phase. It seems Toyota has reasons for doing the things they do....

 

[OGBeno]

On the same note, can the dust cover be removed in order to clean the splines? If so, is it simply tapped out?

Thanks.

Ali--

The dust cover is a bit tough. You might have to get some type of chisel or flat screw driver, put it where the dust cover meets the rest of the large part of the shaft and lightly try to get it out wihtout damaging it. The dust cover is a really light weight material and is not very solid.

The drive shaft shop by me here destroyed the old dust cover trying to get it off...

 

[cruiserdan]

STOP!




The 80 series front drive shaft is supposed to be out of phase!


There is a supplement to the 91-92 books that shows the correction. The 1993- and up books show out of phase correctly.




D-

 

[CJF]

What???

Dan,

Are you saying 91-92's all came from the factory out of phase, or that it was later determined they should be put out of phase?

Curtis

 

[tarbe]

Thanks for clearing that up, Dan.

 

[cruiserdan]

What???

Dan,

Are you saying 91-92's all came from the factory out of phase, or that it was later determined they should be put out of phase?

Curtis

I do not know if early vehicles were built in phase or not. The only way to know for sure would be to find an unmolested original and look at it. The correction does not state why it was made.

I can tell you that there was an early part number for 91-2 that was superceeded to the 93-97 number.

 

[OGBeno]

yes, Dan is correct.

I just found the supplement which was hiding way down in the propeller shaft section of TIS.

It corrects the earlier schematic I posted and indeed does show the front drive shaft as being "out-of-phase"

My bad and I apologize for providing the incorrect information in my initial post.

Here is the supplement pic.

 

[CJF]

Wow; learn sumpthin every day.

Apologies here too.

Curtis

 

[ashooter]

Thanks guys! I was a bit perplexed by all this. BTW, the front drive shaft was IN phase before I took it out.

One other question:

Other than needing to be sure the shaft is balanced, does it make any difference how the flange yokes are aligned with the diff & transfer case? Since I'm turning the sleeve yoke end 90 degrees, I CAN'T put it back the same way I got it out.

 

[Gauge]

Does it REALLY make a difference if it is in phase or out of phase? Seems like it would work the same to me. Just my .02.

 

[ashooter]

I just did some calling around and found out that the nearest place anybody knows of that can balance a driveshaft is about 90 miles from me!!!

So, now I'm wondering two things:

1) Should I put it back in the way it was before? IN phase?

2) Or, should I put it 90 deg. out of phase, cross my fingers, and drive it and see if there's any funky vibration?

Which is the better option?

 

[CJF]

Why not give it shot out of phase, I guess...

Curtis

 

[Tools R Us]

I have run the front shaft both ways, on my lifted truck it runs slightly smoother in phase. Toyota assembles them with all of the grease fittings pointing to the same side, so it's easy to reassemble them how they were originally, if someone hasn't replaced the u-joints incorrectly.

 

[robjam]

Does it REALLY make a difference if it is in phase or out of phase? Seems like it would work the same to me. Just my .02.

I have had this discussion here recently. I understand them to be 90 degrees out of phase on the front on my 92 FJ-80
I took my driveshafts to FleetPride and had the new u-joints installed and shafts balanced.
I noticed the front was now balanced in-phase when I got it back. The tech there told me that they "phase-up" driveshafts when they are re-balanced. So, mine is currently in-phase, but I'm considering having them re-do it, as it is supposed to be and as I had it marked.

Can anyone of extensive knowledge here tell me what the difference amounts to? Seems balanced is most important, but this is why I'm asking. I'm really just a dangerous moron

 

[C6H12O6]

I just got off the phone with the driveline shop and the guy was amazed I wanted it 90* out of phase on the front shaft. Says he's never heard of that. 20-something degrees and forty-something degrees, sometimes, but never 90* out.

He also mentioned that as soon as I lifted it (2.5 Med OME), I threw any geometry issues Toyota was hoping to fix with the out of phase shaft out the window. He thought I was nuts for wanting it out of phase and it took some convincing ~ FSM, Toyota parts guru's advice, etc.

Any reason after all this debate to defer to his advice and go in phase with a lift? I know the FSM shows out of phase on the front shaft, but are the guys with lift still worried about this? Am I really beating a dead horse? Probably. He's going out of phase unless I call him back.

 

[IBCRUSN]

I initially had the same issue with Mr. Driveshaft in NJ. After I showed him the MM he balked some but changed it. He did mention that what we are calling 90* out of phase is actually in phase. His description of out of phase was anything other than true in phase and 90* in phase.

 

[OGBeno]

I initially had the same issue with Mr. Driveshaft in NJ. After I showed him the MM he balked some but changed it. He did mention that what we are calling 90* out of phase is actually in phase. His description of out of phase was anything other than true in phase and 90* in phase.

Kris--so what you are saying (well, your driveshaft expert) is that anything that does not line up the the two ends of the DS either via direct line-up (what we are calling "in-phase") or by off-setting it 90* (what we are calling "out-of-phase" but what your guy is calling 90* in-phase) is basically truly "out of phase"?

Thanks for this tidbit...hope all is well in KS.
-o-