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LM1 Clutch and Flywheel

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Kidneb View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kidneb Quote  Post ReplyReply Direct Link To This Post Posted: 05 Dec 2018 at 16:19
Plenty of good advice and suggestions here, but there's one thing I don't see mentioned;
Plates are oily you say, that could very well indicate leaking clutch pushrod seals. That would allow gearbox oil to migrate right into the heart of the clutch.
You could of course be experiencing multiple leaks on the old girl !
Why did you take it apart, slipping clutch,- dripping oil ?

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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 2018 at 12:02
He says (in OP) to replace crankshaft seal. Normally not easy for oil to get into the plates from there, but this is a fancy lightened clutch, so who knows; even so you still may have a point.



"Chicken nuggets don't dance on a Tuesday."
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GuzziPaul View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GuzziPaul Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 2018 at 13:01
Originally posted by Gianni Gianni wrote:

I've had a leak past the Jubilee clip at the bottom of the big breather connection to the LM breather box. It dribbled down into the clutch housing and appeared at the bottom of the gearbox through the lever window. Looks terrible, five minute fix after three hours diagnosis of course. Had to remove the breather box to find out. The oil on the inside of the upper part of the breather pipe was the clue - and the split loose pipe. Cry

Yes, I think that may be it, it does look a bit oily round there and the bottom jubilee clip was loose. I've ordered an o-ring to slip in there as well as a new gasket for the breather which I also think is leaking.
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GuzziPaul View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GuzziPaul Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 2018 at 13:11
Originally posted by Kidneb Kidneb wrote:

Plenty of good advice and suggestions here, but there's one thing I don't see mentioned;
Plates are oily you say, that could very well indicate leaking clutch pushrod seals. That would allow gearbox oil to migrate right into the heart of the clutch.
You could of course be experiencing multiple leaks on the old girl !
Why did you take it apart, slipping clutch,- dripping oil ?

 The central bearing carrier area is dry and clean so I don't think it's coming from the crankshaft seal. The central area of the clutch is also dry so don't think its coming from the gearbox.

The clutch wasn't slipping,  it was (mostly) the oil at the back of the engine, on the stand etc. I've also identified that the UJ boot was split and that "may" have explained some of the oil in the area outside but not at the bottom and right of the bellhouse.

I cleaned it up last night and I'll give it another long hard look tonight.
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swede View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote swede Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 2018 at 15:32
I had mine like that and it turned out to be melting waxoyl, that I had sprayed on the engine (for an Elephant rally) finding it's way down, into the clutch housing, from up between the V. Presumably, an oil leak would do similar?  When you put it back, I cut 2 pieces of hardboard, the length to fit across the centre plate splined holes in the middle, and made them interlock by cutting a slot half way across their centres so the two interlocking pieces made a cross which fitted though the splined centres of the two plates and kept the plates lined up. Hope that makes sense!                                                                     Use longer bolts to start pulling the ring gear plate in untill the original screws reach.                               Note the painted mark on the flywheel and crank centre or your timing marks will be wrong on the rim.
   There is a mark, also (indent, not paint) on the plain centre plate teeth to flywheel inner splines.  
   My flywheel centre screws have been ok not replaced but toque them correctly and loc-tite them (154000 miles so far)
   I super glued the springs into the recesses in the back of the plain centre plate as the springs can not locate into them and it makes getting the plates and things back together easier with only 2 hands.
   I use a smear of high content moly-grease on the moving parts. ( get it on ebay)
   I hope that all helps, I've done it a few times so it's what I've evolved by trial and error and by being a mechanic for over half a century.    
swede in the shed
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simonnorthroad View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote simonnorthroad Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 2018 at 15:39
Yes Ill second putting sealant or better JB-Weld round the circular camshaft-tunnel 'coreplug' rim, at the top of your picture.

Mine popped-out of place in Normandy en-route to Dijon under routine crankcase pressure and belched all its oil everywhere = game over 
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swede View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote swede Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 2018 at 16:35
I don't think clutch push rod seai an option. it will leak into that centre piece that the push rod pushes forward and, on your picture, that looks dusty dry.
swede in the shed
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Kidneb View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kidneb Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 2018 at 19:04
Originally posted by swede swede wrote:

I don't think clutch push rod seai an option. it will leak into that centre piece that the push rod pushes forward and, on your picture, that looks dusty dry.

Yes- you're right of course. I just had the oily plates in mind and forgot to look at the picture.
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