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  #1  
Old 12-26-2015, 09:05 AM
mack mack is offline
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Clutch Pressure Plate

So I've been working on my spare motor lately and was checking out the clutch and this is what I found. Note that the galling is only present on three of the towers but two of the three are just surface abrassions. The one in the center of this picture however is deeper. I've checked out the center assembly and the holes the pressure plate towers fit through show no signs of contact. All the lands and grooves are pristine. I dry fitted it to gether to look for any play and couldn't find anything.The spider/star is pristine.
I'm having a tuff time getting my ears around what caused this. If the springs weren't properly seated, the spider shouldn't have gone down and seated properly. I confess I didn't pay much attention when taking it apart so I didn't notice anything out of alignment. But because only three are affected, something was a miss.
Any idea's?
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mack
79 XS 1100 SF Special
HERMES
original owner
http://i946.photobucket.com/albums/a...ps6932d5df.jpg

81 XS 1100 LH MNS
SPICA
http://i946.photobucket.com/albums/ad305/mack-055/2.jpg

78 XS 11E
IOTA
https://youtu.be/wB5Jfbp6SUc
https://youtu.be/RaI3WYHSuWA



Have recovery trailer and shop if you breakdown in my area.
Frankford, Ont, Canada
613-398-6186
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  #2  
Old 12-26-2015, 04:13 PM
BA80's Avatar
BA80 BA80 is offline
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That's a mystery mack. There's nothing there but the springs.

The only thing I could say it MIGHT be is someone tried to put spacers under the springs and it didn't work out well. They came apart or slipped out of place and rattled around in there.
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Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.Ē

― Albert Einstein

80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

The list changes.
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  #3  
Old 12-27-2015, 07:14 AM
mack mack is offline
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Investigating

Been thinking about this and have a hypothesis Iím going to try to check out. The only movement for that plate is in and out. The thickness of the galling is about the depth of the movement the throw out bearing would apply when the clutch lever is engaged. That would put the affected area right in the circular holes in the center assembly. But in order for it to make contact with the walls to cause the galling, there would need to be an oscillation. So ÖÖ Iím thinking that either the main shaft has runout, or one or both bearings are defective, despite rolling freely by hand. Not sure if I have the ability to check the shaft for runout. I do have a dial indicator but no V-blocks and Iím not sure I can attach the indicator to the case half and use that for a seat to rotate and watch the indicator. Iíll see, but these are what Iíll be checking. Iíll also inspect all the gear surfaces to look for evidence of a similar oscillation. If Iím right that might be why the bike was taken off the road in 88 and declared unroad worthy. It only has about 11K miles on it according to the DMV records. But, if that was the case, it would have had a very bad shake to it at higher rpm.
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mack
79 XS 1100 SF Special
HERMES
original owner
http://i946.photobucket.com/albums/a...ps6932d5df.jpg

81 XS 1100 LH MNS
SPICA
http://i946.photobucket.com/albums/ad305/mack-055/2.jpg

78 XS 11E
IOTA
https://youtu.be/wB5Jfbp6SUc
https://youtu.be/RaI3WYHSuWA



Have recovery trailer and shop if you breakdown in my area.
Frankford, Ont, Canada
613-398-6186
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  #4  
Old 12-28-2015, 10:17 AM
mack mack is offline
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Still investigating

Well I was right about the depth of the plunge on the pressure plate but it isn't enough to have the plate ride out of the lands and groves of the center piece. Your right Greg, it's a mystery.
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mack
79 XS 1100 SF Special
HERMES
original owner
http://i946.photobucket.com/albums/a...ps6932d5df.jpg

81 XS 1100 LH MNS
SPICA
http://i946.photobucket.com/albums/ad305/mack-055/2.jpg

78 XS 11E
IOTA
https://youtu.be/wB5Jfbp6SUc
https://youtu.be/RaI3WYHSuWA



Have recovery trailer and shop if you breakdown in my area.
Frankford, Ont, Canada
613-398-6186
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  #5  
Old 12-28-2015, 12:18 PM
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James England James England is offline
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How about weak springs which, instead of compressing evenly when the clutch is pulled in, bend to one side like a banana (if you see what I mean)?
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XS1100F 1980 European model. Standard. Dyna coils. Iridium plugs. XS750 final drive (sometimes). Micron fork brace. Progressive front springs. Geezer regulator/rectifier. Stainless 4 into 2 exhaust. Auto CCT (Venturer 1300) SOLD. New project now on the go. 1980 European model.
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  #6  
Old 12-28-2015, 05:37 PM
mack mack is offline
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Hi James

I measured the springs today and they were all around 41.36mm so the length was ok and they all still had the blue dye on them. But your point is well taken. I'll replace them at the same time as the friction disc's. Which brings me to another point. i measured those disc's today,( at every tab) and they all have more wear in one quadrant( three tabs). I find that weird as well. You would think that the wear would be uniform, but it wasn't.
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mack
79 XS 1100 SF Special
HERMES
original owner
http://i946.photobucket.com/albums/a...ps6932d5df.jpg

81 XS 1100 LH MNS
SPICA
http://i946.photobucket.com/albums/ad305/mack-055/2.jpg

78 XS 11E
IOTA
https://youtu.be/wB5Jfbp6SUc
https://youtu.be/RaI3WYHSuWA



Have recovery trailer and shop if you breakdown in my area.
Frankford, Ont, Canada
613-398-6186
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  #7  
Old 12-28-2015, 07:48 PM
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TopCatGr58 TopCatGr58 is offline
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Hey Mack,

James' comment got me thinking! Okay, it's surprising that it only has 11K miles but this much wear. You would think that the clutch case cover would not have been taken off. But what I'm thinking is that 1 of the 3 balls in the throwout lever/rod assembly was out of position, and so when the clutch is activated/level pulled, it would push against the throwout bearing/star plate assembly at an angle instead of evenly all around. This could also contribute to the clutch plates not being able to be separated evenly which could also lead to the uneven wear on the frictions. JAT!

T.C.
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  #8  
Old 12-28-2015, 08:12 PM
mack mack is offline
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Looking

at the inside of the motor so far, leads me to believe it was used for a lot of quarter mile drags. So it may have had several sets of friction plates and springs put into it. So what I'm seeing now could very well be old damage. It's a really nice motor though, everything cleaned up very well and who ever was shifting the gears knew what he was doing.
Originally it was plugged with crud, road oil, asphalt chips, and stones throughout all the cooling fins and the inside had alot of sludge in the nooks and crannies in the cases and oil pan.
No real damage other than the pressure plate.
I've got lots of plasti gauge, new set of rings, new con rod shells, new main shells if it needs them, and I'll do the washer swap for sure.
Tried to make contact with the guy I bought it off five years ago, but he's moved so no luck there. But the people at the DMV gave me a form to fill out to get title for it. I didn't worry about a bill of sale at the time, because I was only going to use it as parts. But with so few miles on it, and my other bikes all in new condition, I will never need parts so ......once done I may sell it.

Excellent point TC, I'll certainly check out the whole mechanism.
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mack
79 XS 1100 SF Special
HERMES
original owner
http://i946.photobucket.com/albums/a...ps6932d5df.jpg

81 XS 1100 LH MNS
SPICA
http://i946.photobucket.com/albums/ad305/mack-055/2.jpg

78 XS 11E
IOTA
https://youtu.be/wB5Jfbp6SUc
https://youtu.be/RaI3WYHSuWA



Have recovery trailer and shop if you breakdown in my area.
Frankford, Ont, Canada
613-398-6186

Last edited by mack; 12-28-2015 at 08:14 PM.
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  #9  
Old 12-31-2015, 06:42 PM
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trbig trbig is offline
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If that shows wear there, be sure to check where the manual says to.. the other half of that where all the clutch plate tabs go. If those slots aren't smooth, but instead look notchy, it can cause clutch problems.

As for the part pictured, it looks to me that it's obviously wear pattern from the springs just by looking at the spacing of the marks. Spring steel is tough stuff, but if the manual doesn't address this, I wouldn't sweat it. If you do, I've got several here.
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You can live to be 100, as long as you give up everything that would make you want to live to be 100!

Current bikes:
'06 Suzuki DR650
*'82 XJ1100 with the 1179 kit. "Mad Maxim"
'82 XJ1100 Completely stock fixer-upper
'82 XJ1100 Bagger fixer-upper
'82 XJ1100 Motor/frame and lots of boxes of parts
'82 XJ1100 Parts bike
'81 XS1100 Special
'81 YZ250
'80 XS850 Special
'80 XR100
*Crashed/Totalled, still own
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  #10  
Old 01-01-2016, 09:16 AM
mack mack is offline
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Thanx Big

Thanx big. It in iitself is no big deal. I'm just making sure a more serious problem wasn't present before I closed up the cases.
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mack
79 XS 1100 SF Special
HERMES
original owner
http://i946.photobucket.com/albums/a...ps6932d5df.jpg

81 XS 1100 LH MNS
SPICA
http://i946.photobucket.com/albums/ad305/mack-055/2.jpg

78 XS 11E
IOTA
https://youtu.be/wB5Jfbp6SUc
https://youtu.be/RaI3WYHSuWA



Have recovery trailer and shop if you breakdown in my area.
Frankford, Ont, Canada
613-398-6186
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  #11  
Old 01-01-2016, 09:52 AM
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trbig trbig is offline
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Location: Ada, Oklahoma
Posts: 7,838
I think that the way the star plate that you compress the springs with, it's a weird design. The little arms on the outside edge don't really center up the springs. Worst case scenario is a clutch problem later. Although it's a bit of a pain to go back in there, and I understand your wanting to get it right before buttoning up, you can do it on the sidestand and don't even have to drain the oil to get in there to fix it later if need be.
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Try your hardest to be the kind of person your dog thinks you are.

You can live to be 100, as long as you give up everything that would make you want to live to be 100!

Current bikes:
'06 Suzuki DR650
*'82 XJ1100 with the 1179 kit. "Mad Maxim"
'82 XJ1100 Completely stock fixer-upper
'82 XJ1100 Bagger fixer-upper
'82 XJ1100 Motor/frame and lots of boxes of parts
'82 XJ1100 Parts bike
'81 XS1100 Special
'81 YZ250
'80 XS850 Special
'80 XR100
*Crashed/Totalled, still own
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  #12  
Old 01-01-2016, 12:08 PM
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BA80 BA80 is offline
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Location: Tulsa, Ok
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If it was used for drags it's very possible that a spring or 2 broke under the stress. It might be that the plate you have is part of a clutch pack that grenaded and it survived and was reused.

At any rate, I don't think it is part of a current or ongoing issue.
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Greg

Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.Ē

― Albert Einstein

80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

The list changes.
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  #13  
Old 01-01-2016, 07:54 PM
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XS1100_OEM4ME XS1100_OEM4ME is offline
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Something happened

Quote:
Originally Posted by mack View Post
So I've been working on my spare motor lately and was checking out the clutch and this is what I found. Note that the galling is only present on three of the towers but two of the three are just surface abrassions. The one in the center of this picture however is deeper. I've checked out the center assembly and the holes the pressure plate towers fit through show no signs of contact. All the lands and grooves are pristine. I dry fitted it to gether to look for any play and couldn't find anything.The spider/star is pristine.
I'm having a tuff time getting my ears around what caused this. If the springs weren't properly seated, the spider shouldn't have gone down and seated properly. I confess I didn't pay much attention when taking it apart so I didn't notice anything out of alignment. But because only three are affected, something was a miss.
Any idea's?
Something happened to cause the marks. I am guessing a clutch failure some where in the past. It might work fine and then again it might be out of whack due to the damage. I see these come up on flebay cheep from time to time, or a member may have one cheep. If you do close up and find a vibration, then you will need to start over and fix it again. If you fix it now, you will sleep like a baby JIMHO
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1979 XS1100 Special (Mad Max, OEM) Current
1980 XS1100 Special
1990 V Max
1982 KZ750 LTD Twin
1986 700 FZR Yamaha Fazer (faster then expected)
1979 XS750 Special (my 1st Special)
1974 CB750-Four



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1961 Catalina 389/1970 Torino GT 351/1967GTO 12to1 comp./ Roller cam/ T-10/ 456 gear/Tri-power/1967 GTO 400, 1969 Camaro, 1968 Z28, 2001 BMW M Roadster 0 to 60 in 4.5 sec. Jaguar XK8
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