A Diff Divided (4.375 CLSD) Field overhaul and shimming

[duragg]

Picked up my R200 CLSD 4.375.

 

Took it apart of course...

Will upload the remainder of the pictures tomorrow.

 

It has 3 internal and 3 external tabbed clutch pads on each side.

I think this is good?

 

Stne simple

Edited December 6, 2011 by duragg

[JMortensen]

This is good. The cheesy 300ZXT ones had one drive clutch and a big spacer in there instead.

 

Out of curiosity, what are the ramp angles like and do you have thrust washers on the spider gears?

Edited December 4, 2011 by JMortensen

[duragg]

I will take pics of the ramp. Those are the guides the spider rides in?

 

I didn't see any washers on the spiders but will look at

that too and report back.

 

Q; should I bother changing side bearings? They look great.

Q2: the side seals are readily avail? From?

 

Q3: do I even bother checking break away?

[duragg]

Ok, Hybridz back online, SNL is over, things are improving...

 

Does this show the "ramps" These control the expansion of the center based on power and squeeze the clutchpak?

 

 

Some Spider shots. Not thinking I remember any thrust washers, but they could have been stuck to something.

 

[JMortensen]

Weird. Looks like you have a kind of intermediate diff there. It's not the same one that bjhines has that was sold as the Power Brute which had the thrust washers, but you do have the more aggressive ramps and no spacer like the 300ZXT.

 

4.38 is probably the Skyline diff and I think those were supposed to be more aggressive, so maybe it shouldn't be that much of a surprise.

[duragg]

I'm thinking if you break a later R200 you are making TB launches on a big-boy motor and have broken a LOT of other parts along the way.

Some more pics of my disassemble.

 

Thought I was going to need a different input shaft but this looks normal I think.

 

 

 

 

 

 

 

 

Found new side seals at Orielly picking up today with some stub shafts from a DD member.

[duragg]

Getting like 45 pounds break away (wet).

Took the unit apart and allbis in order still.

 

That very first bellville plate with outside ears is funny cause it looks like you carefully center it and then draw the cover down on it- hoping the ears are centered and in their grooves.

 

Holding for guidance and machine a better plate to get a torque wrech on a concentric nut.

[duragg]

Thanks to JM and Gordon and the others for their help.

 

Got some .005" shim stock which I will cut to make some shims.

 

I believe the shim stock will sit on the outside of the furthest outer plate sandwiched against the case.

There is no relative motion between this outer plate and the housing so the shim won't wear, just sit and add preload.

Shim goes on top of this plate you see here below

Note in the picture above, the holes in the case leave an impression in the plate and clearly there is no relative motion.

 

You can see the outer face of the outer-most plate through the housing (where those impressions were left).

When done you will be able to see the shim stock through these holes on both ends.

 

And to complete the overhaul, some new output shaft seals which Autozone had in stock.

 

Tomorrow I will shim and lube and shim again and get to my target Break Away Torque (BAT) with my new handy tool being welded in the morning.

Will gladly take more pics while I am at it if anybody cares to see any other specific thing while I have this apart.

[duragg]

No. All wrong.

I grabbed the wrong shim stock- see above.

 

Cut, installed and tested 5 shims which made no difference. Off by a factor of 10. That was ,0005" (half-thou) stock.

 

Beer now.

[duragg]

Interesting option. Almost fits..

Arbor shims

 

 

ARBOR SHIM SET - 2.25" ID x 3.25" OD

Each ARBOR SHIM SET - 2.25" ID x 3.25" OD contains the following sizes:

 

0.001"

0.0015"

0.002"

0.003"

0.004"

0.005"

0.006"

0.007"

0.008"

0.01"

0.012"

0.015"

0.02"

0.025"

0.032"

0.047"

0.062"

0.093"

0.125"

[JMortensen]

I would just button it back up and run it. 45 lbs is plenty considering you have the more aggressive ramps.

[duragg]

I couldn't sleep with myself if I did that. I like doing things to excess.

[duragg]

I can't install the R200 in the car for another week anyways. Still collecting all the other parts.

So in the meantime all this is keeping me from breaking something else.