All in - pulling the 4.6 engine and trans to fix oil leaks once and for all

[BigBlack48is]

Hmm... that's the first time I have ever seen a green / yellow BMW ??

[stunt]

Here's another one



In all seriousness, I hope to really get going on the transmission this Sunday. I'm longing to get the X back on the road and I don't want to leave the A/C components exposed too much longer with all the humidity summer brings.

[BigBlack48is]

Originally Posted by stunt

Here's another one



In all seriousness, I hope to really get going on the transmission this Sunday. I'm longing to get the X back on the road and I don't want to leave the A/C components exposed too much longer with all the humidity summer brings.

that was awesome!! look forward to seeing the victory pictures!!

[admranger]

lol at the John Deere. My brother manages three JD dealerships in W. Nebraska. I used to run a JD sticker on the back of my race car...mainly due to my frequent agricultural excursions.

I also cleared some land over Memorial Day weekend. Turned some dead trees on the family farm into 5+ cords of firewood (with a metric butt-ton of help!). Got to fire off my new Stihl MS311 chainsaw w/the 20" bar. Made short work of most of the trees I encountered.

Love the way you organized the transmission on that fold out table. I might just have to buy a table like that now!

[stunt]

I got the A/B clutches mostly disassembled.

Here are the individual pieces. I have red arrows by the parts that looks suspect so far.



B clutch back



4 of the B clutch steels



All 6 B clutch friction plates



A clutch pack



3 of the A clutch steels



All 6 A clutch friction plates



Here are the other main parts of Tower II









This is the only other component that I'm seeing potentially being a concern. Are those embedded particles in the copper band normal? What do you guys think?



And here's another shot of the bearing



I'll look up the thickness tolerances on the steels and friction plates, but they are all within a few thousands of an inch and look in good shape, at least to my very untrained eye.

[upallnight]

This bearing is shot I hope you don't intend to reuse it.

[puddinboo]

^ I agree some good pits on those rollar bearrings.

[stunt]

Yep, definitely plan to replace that pitted needle bearing!

On the clutch packs, it looks like the way to measure each one, is to do the whole stack at a time with 200N of pressure applied. Then the height of each pack is measured as Mx where x stands for the clutch pack (A-F).

One then has to determine the installation space Ex, which is the height inside each cylinder (Wf + F) where F is the thickness of the base of the cylinder.

So Ex = Wx + F and the test value (Px) = Ex - Mx.

In the case of clutch pack A, Pa should be between 3.75 and 5.75mm. The sample value given in the repair manual for Ma is 26.65mm.

I'm unclear about the Sa value (3.0 mm is the sample value given for clutch A). This is used to calculate the final clutch clearance (Pa - Sa), which should be 1.95 - 2.25 mm in the case of clutch A.

As far as how to apply 200N to each clutch pack before obtaining the Mx value, I suppose the easiest method would be to place 20.4 kg (45 lbs) worth of weights on top of each clutch pack before measuring?

Guess I'll need to put the micrometer away and get out the dial gauge. I wonder if I can cheat and just use the micrometer directly on each clutch pack to get the Mx value? I figured I can squeeze the pack together with my fingers and then measure the thickness with the micrometer? Maybe I'll try it both ways and see if I get the same result.

[RRPhil]

The importance of the 200N load is that the wavy plate is only partially compressed by this force so unfortunately there is no other way of determining the stack height other than to apply the correct load. I simply use a 20.4kg weight and a vernier height gauge (on a flat surface) for the measurements.

Sx is just the thickness of the snap ring. The snap rings are selectable from a range of available thicknesses – ten in the case of the A-clutch, varying from 1.80mm to 3.60mm - and this is what is used to produce the correct clearance.



Phil

[stunt]

Thanks Phill! That makes perfect sense now on what Sx is.

So would you agree with my assessment that the friction disc and steels for clutches A and B look fine and can be reused (assuming of course that I can get the proper Lx value using nothing larger than the 3.60mm (A) and 4.6mm (B) snap rings for clutches A and B respectively)?

Also, are the particles I see imbedded in the copper (brass?) band on disc carrier 72.190 normal/acceptable? Here's that pic again: