How does the center diff gets lubrication? (1 Viewer)

[Rookie2]

I discovered one thing in that link that I will challenge for accuracy. The link that Raven posted said that during humping, temperature, pressure, and resistance increases. I've found through much experimentation that resistance decreases during humping. YMMV.

I would not disagree that that may be correct from your experiences. When dealing with smaller parts and limited travel, those parts are in a more steady state of lubrication, and hence a low level of resistance is maintained. But if you're operating larger parts with extended travel, the lubrication mechanism can be insufficient and thus lead to more resistance.

Just my $0.02.


Rookie2

 

[Beowulf]

I would not disagree that that may be correct from your experiences.

I guess this needs to be spelled out for you. In my extensive experience with massive parts, the resistance is greatest during the initial stages of humping. Lubrication increases with time and resistance, due to constriction, decreases with time. Toward the end of the humping cycle, there is some momentary increase in resistance as rapid constriction temporarily returns in a cyclic pattern. This increase in resistance typically manifests as a brief spasmodic episode and is generally not a problem.

Maybe you need a picture.

-B-

 

[Rookie2]

I guess this needs to be spelled out for you. In my extensive experience with massive parts, the resistance is greatest during the initial stages of humping. Lubrication increases with time and resistance, due to constriction, decreases with time. Toward the end of the humping cycle, there is some momentary increase in resistance as rapid constriction temporarily returns in a cyclic pattern. This increase in resistance typically manifests as a brief spasmodic episode and is generally not a problem.

-B-

You bring up valid points, particularly in the areas of rapid constriction. Frankly I had totally disregarded the resistance during the brief spacmodic episode, as my attention is normally drawn away due to the high level osscilatory moaning that occurs during this phase.

They have most certainly Fawked this portion of the manual up. But generally I found the rest to be accurate and informative

R2

 

[Beowulf]

They have most certainly Fawked this portion of the manual up.

So are you going to contact Toyota/Lexus and ask them to revise that section of the manual?



-B-

 

[Rookie2]

So are you going to contact Toyota/Lexus and ask them to revise that section of the manual?



-B-

If I could get through this explaination with a straight face, I'd do it. But I think at the point of "spasmodic episode", I'd break down into uncontrolable laughter and lose all credibility.

 

[sjcruiser]

It's understandable why Beowulf's graph ended short - but for some others, the cycle continues on (n times)

Fixed it for ya...

 

[e9999]

sadly, it used to be that the opposing entity was doing all the begging in earlier days, whereas now, I'm doing all the begging, so I guess this means that the resistance has greatly increased with time?

 

[RavenTai]

LOL, I can’t keep a straight face reading it.

I guess it probably depends on the operator and driving technique.

 

[cruiserdan]

The factory needs to get involved with ths issue RIGHT NOW.........


















I can't fawkin' breathe at the moment...

 

[landtank]

While all this discussion on the technical aspects of humping is true, the only real way to evaluate the quality of humping is by monitoring the amount of force applied.

While in the begining stages of humping with low levels of lubrication and higher levels of resistance from a greater pressure the force applied may well be at it's highest. I have found that through a rigarous period of humping I can almost completely offset the force applied by an alternate out of phase force which is occampanied by the osscilatory moaning.

However this does seem to be unit specific, and certain dead units might not repond.

 

[e9999]

While all this discussion on the technical aspects of humping is true, the only real way to evaluate the quality of humping is by monitoring the amount of force applied.

While in the begining stages of humping with low levels of lubrication and higher levels of resistance from a greater pressure the force applied may well be at it's highest. I have found that through a rigarous period of humping I can almost completely offset the force applied by an alternate out of phase force which is occampanied by the osscilatory moaning.

However this does seem to be unit specific, and certain dead units might not repond.

dead?

 

[RavenTai]

Raven,

Thanks again for posting the details from the NCF manual. If anyone is interested in more detail of the FZJ80 center diff then there are 4 or 5 pics that LandToy80 posted when he disassembled his xfer. I think I can repost those pics if you cannot find them. It might make this thread more complete with those pics.

-B-

Those were good pictures to bad they were lost

 

[Beowulf]

I will pm kurt and see if he can round them up and repost in the earlier thread and/or in this thread.

-B-

 

[landtoy80]

Hay, Uall

I haven't read the post yet but

Where do you want me to post pic if t-case?
Here or should I post a new one so it can be put somewhere it can be seen again?

 

[landtoy80]

There is one in CuriserGarage https://forum.ih8mud.com/vbgarage.php?do=view&id=1094
Do you need more?

 

[landtoy80]

I read this post AND
I AM NOT GOING TO POST PIC OF MY NAKED T-CASE WITH ALL THE HUMPING GOING ON

I will try and repost to the old post, thank you!

 

[Beowulf]

Kurt,

You should be able to edit each of your posts in the original thread.

https://forum.ih8mud.com/showthread.php?t=6288&page=1

-B-

 

[robbie]

Are you guys not getting any? how did a t-case discussion turn into a discussion about S#X? you guys are tooo funny. later robbie

 

[landtoy80]

Are you guys not getting any? how did a t-case discussion turn into a discussion about S#X? you guys are tooo funny. later robbie

Friction!!!!

 

[Beowulf]

Robbie,

I don't know what you're referring to, but we were talking about the section in the NCF manual (Link posted by Raven) that discussed the operation of the VC.

What did you THINK we were talking about?

-B-