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Remove bushing from clutch cover - advice please

Started by MonsterDamo, May 08, 2014, 12:05:21 AM

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MonsterDamo

May 08, 2014, 12:05:21 AM
I've removed both my clutch and alternator side covers from my ol' 620. The years haven't been kind to them, and I needed to get at the stator.



As I intend to have them powdercoated and because the misc OEM parts are inexpensive I figured I'd do it "right" and remove all bearings, sight glasses, seals, etc.

I'm stuck on this one, though:



The plastic bushing that sat inside it pretty much fell to pieces when I removed the circlip, so I figure there's no going back now. Has anyone had any success removing this one short of machining it out? I've heard references to using heat but I'm really not sure how to approach that.

Thanks!
'02 750Sie - Rizoma bars & grips, CRG Hindsight mirrors, chopped & cored exhaust, red anodized bling
'02 620Dark - tail chop, charcoal canister in the bin

ducpainter

#1
May 08, 2014, 02:58:49 AM
There's no need to remove that bushing for powdercoating.

Just get a new seal.

"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


MonsterDamo

#2
May 08, 2014, 07:41:36 AM
From what I can see from exploded parts diagrams, that top cup piece appears to be part of the original seal so will need to come out.
'02 750Sie - Rizoma bars & grips, CRG Hindsight mirrors, chopped & cored exhaust, red anodized bling
'02 620Dark - tail chop, charcoal canister in the bin

zippsub9

#3
May 08, 2014, 07:54:02 AM
I powdercoated mine with that one in, ducpainter is right on. 

MonsterDamo

#4
May 08, 2014, 08:06:19 AM
I get that you CAN leave it in, but the situation I have is that the bushing seems to have come apart so will need to come out.
'02 750Sie - Rizoma bars & grips, CRG Hindsight mirrors, chopped & cored exhaust, red anodized bling
'02 620Dark - tail chop, charcoal canister in the bin

Speeddog

#5
May 08, 2014, 08:32:20 AM Last Edit: May 08, 2014, 08:33:59 AM by Speeddog
That is indeed the steel cup that is the structural part of the (former) seal.

Judicious use of a dremel with a small carbide burr is the only way I know of, short of somehow setting it up in a mill and boring it out.

Working in one area, you can dremel through *just* the steel cup, then carefully pry or with a small chisel and hammer, and collapse the ring inward.

Possibly, if you lay the cover mating face down in an oven, heating to 300 degF, it may fall out.
Use caution, as some oven owners are averse to baking of engine parts.
Making sure the cover is as oil-free as possible will also reduce the chance of setting off the smoke alarm.
- - - - - Valley Desmo Service - - - - -
Reseda, CA
(951) 640-8908

~~~ "We've rearranged the deck chairs, refilled the champagne glasses, and the band sounds great. This is fine." - Alberto Puig ~~~

ducpainter

#6
May 08, 2014, 09:42:37 AM
Quote from: MonsterDamo on May 08, 2014, 07:41:36 AM
From what I can see from exploded parts diagrams, that top cup piece appears to be part of the original seal so will need to come out.
I missed that. I was looking at the brass bushing.

I've had luck grinding a bevel on a tapered punch and getting between the seal body and the case and collapsing the metal so you can get a hold of it with some vice grips
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


MonsterDamo

#7
May 08, 2014, 10:52:17 AM
Quote from: ducpainter on May 08, 2014, 09:42:37 AM
I missed that. I was looking at the brass bushing.

I've had luck grinding a bevel on a tapered punch and getting between the seal body and the case and collapsing the metal so you can get a hold of it with some vice grips

That's kind of where I'm at now. This thing just won't let go! I think it's gonna leave some chew marks on the case underneath.
'02 750Sie - Rizoma bars & grips, CRG Hindsight mirrors, chopped & cored exhaust, red anodized bling
'02 620Dark - tail chop, charcoal canister in the bin

ducpainter

#8
May 08, 2014, 11:14:42 AM
Quote from: MonsterDamo on May 08, 2014, 10:52:17 AM
That's kind of where I'm at now. This thing just won't let go! I think it's gonna leave some chew marks on the case underneath.
Marks can be lightly dressed with some paper and some non hardening sealer used to avoid leaks.

If the marks are at the outside edge of the bore chances are they wouldn't cause a leak.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


MonsterDamo

#9
May 08, 2014, 03:46:13 PM
Good lawd... that was an ordeal...

This is the aftermath:



Does that still look serviceable?
'02 750Sie - Rizoma bars & grips, CRG Hindsight mirrors, chopped & cored exhaust, red anodized bling
'02 620Dark - tail chop, charcoal canister in the bin

ducpainter

#10
May 08, 2014, 04:07:18 PM
Clean off the high spots and install a new seal.

I think you'll be fine.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


Speeddog

#11
May 08, 2014, 08:57:02 PM
Quote from: ducpainter on May 08, 2014, 04:07:18 PM
Clean off the high spots and install a new seal.

I think you'll be fine.

+1.

Thoroughly clean that oil gallery in the cover.
Oil flows up from the bottom, where the O-ring is on the case (make sure that's there on reassembly).
You don't want it pumping swarf into your crank, then to the rod bearings.
- - - - - Valley Desmo Service - - - - -
Reseda, CA
(951) 640-8908

~~~ "We've rearranged the deck chairs, refilled the champagne glasses, and the band sounds great. This is fine." - Alberto Puig ~~~

garryc

#12
May 08, 2014, 11:01:23 PM
Following this project with interest .
When you get the covers powder coated do you need to block off/mask the seal cavities case bolt holes etc?
If so what with

thanks

ducpainter

#13
May 09, 2014, 04:58:19 AM
Quote from: garryc on May 08, 2014, 11:01:23 PM
Following this project with interest .
When you get the covers powder coated do you need to block off/mask the seal cavities case bolt holes etc?
If so what with

thanks
All gasket/o-ring mating surfaces, threaded holes, and seal bores should be masked.

The coater will have the stuff to do it.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


zippsub9

#14
May 09, 2014, 06:41:12 AM
Should, yes, but often the faraday effect takes care of thread holes.  I mask all gasket surfaces with aluminum tape, great stuff, bake, then clean off glue residue with acetone.  I use aluminum foil to make most stuff when spraying.  Cork also works great for larger holes and wont burn since it is a flame retardent, but make sure it is legit cork.  I coated my case laying flat on a tray, so any powder that wisks back up on the back side, minimal to none, wont be floating debris as it will bond during the baking process.

But, yes, if you take it to someone they will use silicone plugs more than likely.
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