Lotus Elan

How do you know when a clutch cover is worn out?

PostPost by: tdafforn » Tue May 29, 2007 3:17 pm

hi guys,
As the header says..
How do you know when a clutch cover is worn out?
I have the clutch out of the car, the friction disc is to worn to put back (<1mm from the rivets), but how do I tell wether the cover needs replaceing as well?
What wears on them?
Tim
User avatar
tdafforn
Fourth Gear
Fourth Gear
 
Posts: 867
Joined: 12 Sep 2003
Location: Kenilworth Warwks.

PostPost by: john.p.clegg » Tue May 29, 2007 4:27 pm

Tim

The only things to "wear" are the spring tension and the friction surface??

John :wink:
User avatar
john.p.clegg
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 5707
Joined: 21 Sep 2003
Location: Manchester

PostPost by: Bruce Crowthorne » Tue May 29, 2007 4:40 pm

I just replaced mine as a precaution.
It cost ?58 from QED (I am sure MUCH less if you look around) so not worth the hassle of taking the engine out if it goes.
Bruce
User avatar
Bruce Crowthorne
Third Gear
Third Gear
 
Posts: 264
Joined: 30 Aug 2005
Location: Emsworth, Hants

PostPost by: 1964 S1 » Wed May 30, 2007 2:29 am

Hi, as John says, the spring tension "wears" but that's it. If you still have the car apart, I recommend replacing what we call the pressure plate, the spring tension can lessen making for a soft pedal and clutch slippage down the road or one can break from heat through the years causing even more slippage. It's worth the price of the part as there is no labor cost involved. Eric
1964 S1
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1496
Joined: 15 Sep 2003
Location: Hamilton County, Ohio

PostPost by: Frank Howard » Wed May 30, 2007 3:14 am

Tim,

And while you're at it, do yourself a favor and replace the release (throwout) bearing for sure and possibly the spigot (pilot) bearing.
Frank Howard
'71 S4 SE
Minnesota
Frank Howard
Fourth Gear
Fourth Gear
 
Posts: 994
Joined: 30 Mar 2004

PostPost by: tdafforn » Wed May 30, 2007 10:32 am

hi guys,
Thanks for the info..
Have a replacement the spiggot bearing ready to go in and will get a release bearing as the last one disintegrated as I took the engine off.
Tim
User avatar
tdafforn
Fourth Gear
Fourth Gear
 
Posts: 867
Joined: 12 Sep 2003
Location: Kenilworth Warwks.

PostPost by: triumphelan » Wed May 30, 2007 12:42 pm

I would`nt risk it I woud fit all 4 parts metioned and whilst the engine was out the other "usual susspects" aswell
Regards John 1969S4DHC
triumphelan
Third Gear
Third Gear
 
Posts: 297
Joined: 04 Jul 2005
Location: UK North London HA61PY

PostPost by: denicholls2 » Wed May 30, 2007 6:09 pm

One of the things some may forget to consider is that Lotus engines often finish a restoration with considerably more horsepower and torque than they started with. If a Twincam, for example, is going from the stockish 100 HP or so to 125 or even 150, all of that excess meets the driveline through the pressure plate. What was marginal is likely to become bleeding edge, even with a light car to motivate. :shock:

In a general rebuild to spec power levels for a car that is regularly driven, I'd expect a pressure plate to outlast two clutches. The disc, after all, was intended to be adequate for a much heavier machine. Wear on the face and metal fatigue in the finger springs due to age are the big factors here, so as is often the case, sitting unused in the garage does not help matters.
denicholls2
Fourth Gear
Fourth Gear
 
Posts: 596
Joined: 23 Jan 2006

PostPost by: tower of strength » Thu May 31, 2007 12:01 am

tdafforn wrote:hi guys,
As the header says..
How do you know when a clutch cover is worn out?
I have the clutch out of the car, the friction disc is to worn to put back (<1mm from the rivets), but how do I tell wether the cover needs replaceing as well?
What wears on them?
Tim


after a shitty weekend and guiness large, the answer is. . . . . . . it slips!!


joking aside, if you've got 1mm depth of friction material to the rivets, then youir driven plate is ok, if you didnt have any problems prior to removal, I'd use the whole lot again, maybe changing the release bearing only. unless of course the cover shows obvious signs of wear,on the drive face and the release bearing surface. also check the driven plate coil springs, if they are loose or broken you will get judder. i have seen clutches in plus 2's shagged after 20K miles and on the other hand perfectly serviceable after 60K!!

Mark
tower of strength
Third Gear
Third Gear
 
Posts: 376
Joined: 15 Mar 2005
Location: Newnham, Northamptonshire

PostPost by: mikealdren » Thu May 31, 2007 8:14 am

As Mark says, the life of a clutch varies enormously - the biggest variable of course is the driver!
Mike
mikealdren
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1054
Joined: 26 Aug 2006
Location: Surrey England

PostPost by: rgh0 » Thu May 31, 2007 1:17 pm

Tim

When I take my clutch cover to my clutch specialist he does 3 things

He checks the diaphram spring load to ensure it is within spec
He grinds the face of the pressue plate to ensure its flat and has the right surface finish to bed in the new clutch plate correctly
He checks the wear points of the moving diaphram spring looking for cracks or excessive wear.

If the diaphram spring is low in pressure or has excessive wear he replaces the spring, the other components have almost infinite life.

regards
Rohan
User avatar
rgh0
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 7570
Joined: 22 Sep 2003
Location: Melbourne, Australia

PostPost by: tdafforn » Thu May 31, 2007 5:06 pm

Hi Rohan,
not sure where I would find such a dedicated mechanic in this country. most of the clutch people aren't interested in the old one, and just want to sell me a new one!
Cheers
Tim
User avatar
tdafforn
Fourth Gear
Fourth Gear
 
Posts: 867
Joined: 12 Sep 2003
Location: Kenilworth Warwks.

PostPost by: rgh0 » Fri Jun 01, 2007 10:44 am

Tim

You just have to look for them . I am sure they will exist. BGT Brakes in Melbourne are a small old fashioned brake and clutch shop. He races a Lotus Cortina in Historics and is a valuable resource to the historic racing and car club community - it may be worthwhile talking to some of the historic racing guys in the UK and seeing if they know an equivalent

Rohan
User avatar
rgh0
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 7570
Joined: 22 Sep 2003
Location: Melbourne, Australia

Total Online:

Users browsing this forum: No registered users and 6 guests