Found, Clutch boot leaking. 87 K75C

[trek97]

Hey guys,
Found some oil on the floor and after some investigation, did a search and found this article seems to agree w what I got going here.

http://www.motobrick.com/index.php/topic,2883.msg16783.html#msg16783

But please take a look at my pics and if you agree/disagree please let me know. 

Plan to order new cup from bobsbmw.com at $45.35. 

Please let me know if you have a better resource.  THANKS!

[The Mighty Gryphon]

I would very, very carefully remove the boot and check it closely for splitting before I spent $44 on a new one.  But that's just me.

[trek97]

I would very, very carefully remove the boot and check it closely for splitting before I spent $44 on a new one.  But that's just me.

Yep, looking for it in manual now.

[The Mighty Gryphon]

If it is split, I would give it a very good cleaning with a paint prep degreaser like PrepsAll and give the split a shot of super glue or possibly the stuff they use for sealing retrofit CV joint boots.

[Martin]

Finally we have something cheaper than the US clutch boot $25.00 Au plus $3.50 freight on Ebay. While you are doing it you might want to fit a grease nipple to your clutch arm, it keeps all the crud and water out.
Regards Martin.

[trek97]

If it is split, I would give it a very good cleaning with a paint prep degreaser like PrepsAll and give the split a shot of super glue or possibly the stuff they use for sealing retrofit CV joint boots.

I was kinda thinking that way.  If its pretty easy to remove/re-fit.  But if its a bear to get off/on there I may not want to do it again next month.

Finally we have something cheaper than the US clutch boot $25.00 Au plus $3.50 freight on Ebay. While you are doing it you might want to fit a grease nipple to your clutch arm, it keeps all the crud and water out.
Regards Martin.

Im finding very few parts like this on ebay here in the USA.  I was looking at the needle roller bearing in the manual and thinking.  Now why wouldnt they have put a zerk on that?  HA!

[trek97]

But, what Im really wondering is why there isnt a real seal somewhere behind that boot around the clutch push rod to begin with?

[Martin]

Due to the size of it might be cheaper to get one from OZ via post. It might be worth contacting him. I am actually thinking about getting one to add to my collection of spares.  http://www.ebay.com.au/itm/BMW-Clutch-Actuation-Pushrod-Rubber-Gaiter-K75-K100-K1100-/142098201573?hash=item2115b67be5:g:DhwAAOSwEjFXc8YK
Regards Martin.

[Inge K.]

Also check that the clutch is correct adjusted.

If the arm have to much angle from where it should contact the sealing surface on the boot,
the spring inside the boot won't be able to add a even pressure all around in the boot...against the lever arm.

[Inge K.]

But, what Im really wondering is why there isnt a real seal somewhere behind that boot around the clutch push rod to begin with?

It is.....inside the end of the gearbox shaft......to prevent the gearbox oil from reaching the clutch.

[trek97]

It is.....inside the end of the gearbox shaft......to prevent the gearbox oil from reaching the clutch.

I have a lot to learn about these BMWs.   :dunno

So is this what you are telling me?  I have a seal deep inside there leaking?  and the oil is running down the push rod to reach this boot?

[trek97]

Its looking like I got to pull the exhaust off.  To get the pivot pin out.  ugh!

[trek97]

Due to the size of it might be cheaper to get one from OZ via post. It might be worth contacting him. I am actually thinking about getting one to add to my collection of spares.  http://www.ebay.com.au/itm/BMW-Clutch-Actuation-Pushrod-Rubber-Gaiter-K75-K100-K1100-/142098201573?hash=item2115b67be5:g:DhwAAOSwEjFXc8YK
Regards Martin.

Heck $25 AU cnoverts to $18.97 US.  I bet shipping is high and would take forever to arrive.

[The Mighty Gryphon]

Just checked the listing.  $24.05 US for shipping to U.S.  No reason to buy from this guy.

[trek97]

Got things as clean and dry as I could.  Bout a 1/2 a cup of mucky gravel and sand in there.

Couldnt find any obvious tear in the boot from this angle. 

Tucked a couple white kleenex under the suspects.  Ill check back in the morning.

[trek97]

Hey Martin the grease zerk is a super idea!

[Martin]

$24.05 seems awfully dear for something you could just stick in an envelope and post. :dunno
Regards Martin.

[Martin]

Just checked Ausralia Post prices to US                                                                                                                                 Use your own envelope
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[trek97]

Also check that the clutch is correct adjusted.

If the arm have to much angle from where it should contact the sealing surface on the boot,
the spring inside the boot won't be able to add a even pressure all around in the boot...against the lever arm.

I checked and found clutch was out of adjustment, THANKS, Inge K! (78mm)

So I got it set at 74.6mm, re-set the rod push bolt at the lever and free play at the control. The boot now looks to fit a bit better.
Also lubed the barrel.

The oil smells of gear oil.  So apparently that is completely normal as there is no inner seal to prevent this.  Though there is an o-ring in there that could be bad.  Im not exactly clear what the o-ring does...maybe its what keeps the oil from traveling into the clutch disk?

Got things dried out again and gonna wait and see if the mis-adjusted clutch was the culprit. (deforming the spring and not applying even pressure around the boot OR the boot is just showing its age and needs replaced.)   

I will report back later.
Thanks guys.


 

[Motorhobo]

At the recommendation of my buddy Mike B who was a BWW mechanic in the classic K era, I put a small dab of blue RTV sealant at the joint between that boot and the clutch arm.

[trek97]

At the recommendation of my buddy Mike B who was a BWW mechanic in the classic K era, I put a small dab of blue RTV sealant at the joint between that boot and the clutch arm.

Sounds like a good idea.  If I find it needs to be repaired/replaced I will do that.
Thanks

[Inge K.]

The oil smells of gear oil.  So apparently that is completely normal as there is no inner seal to prevent this.  Though there is an o-ring in there that could be bad. Im not exactly clear what the o-ring does ...maybe its what keeps the oil from traveling into the clutch disk?

Where is this o-ring located?

[Inge K.]

At the recommendation of my buddy Mike B who was a BWW mechanic in the classic K era, I put a small dab of blue RTV sealant at the joint between that boot and the clutch arm.

Sounds like a good idea.  If I find it needs to be repaired/replaced I will do that.
Thanks

+1. I've also used this metod on a couple of this boot that haven't been so cooperative.

[trek97]

If the clutch adj doest do the trick maybe I will pull it and give it a soak in Wintergreen oil and try the RTV.

[Inge K.]

The oil smells of gear oil.  So apparently that is completely normal as there is no inner seal to prevent this.  Though there is an o-ring in there that could be bad.  Im not exactly clear what the o-ring does...maybe its what keeps the oil from traveling into the clutch disk?

Where is this o-ring located?