LdN overdrive: which gasket goes where?

#1

Here's the deal. I have 2 gaskets that are shaped exactly the same. They
have differing materials. One is "fiber", the other feels a bit more
like felt. They go around the brake ring of the Overdrive unit. But
which one goes where? I read somewhere the gaskets are not
interchangable. The original gaskets are long scraped off.

#2

S1500 <s1500 (AT) comcast (DOT) net.nospam> wrote

Quote:

Here's the deal. I have 2 gaskets that are shaped exactly the same. They
have differing materials. One is "fiber", the other feels a bit more
like felt. They go around the brake ring of the Overdrive unit. But
which one goes where? I read somewhere the gaskets are not
interchangable. The original gaskets are long scraped off.

You will have to give us more information about car and/or make of overdrive
unit.

I have just looked at the exploded diagram of the Laycock unit fitted to
Triumphs, and can't see anywhere where there are two gaskets exactly the
same shape.

Jim

#3

Quote:

You will have to give us more information about car and/or make of
overdrive
unit.

My guess from the title is it's a Laycock overdrive - aren't they "Laycock

de Normanville" or something equally exotic?

I have a service manual to the Laycock unit fitted to Vauxhall Victors, I'll
see if I can find it tonight.

Mike.

#4

Mike Edwards (test (AT) test (DOT) com) gurgled happily, sounding much like they
were saying :

Quote:

You will have to give us more information about car and/or make of
overdrive unit.

My guess from the title is it's a Laycock overdrive - aren't they
"Laycock de Normanville" or something equally exotic?

Indeed they were.

I'd also hazard a guess from the OP's moniker (S1500) that it may be for a
Spitfire 1500...?

#5

Quote:

As far as I can see from the pictures, there's one gasket NKC87 that
goes between the rear housing and the brake ring and another gasket
NKC86 that goes between the brake ring and the main housing.

http://www.rimmerbros.co.uk/spitfire/images/83a.gif
http://www.rimmerbros.co.uk/spitfire/images/81b.gif

Judging from the pics, they do look a bit differently shaped to me, but
rationalisation in dies for replacement gaskets may mean that they're
now the same shape.

I would think that the gasket on the front of the main housing (31H1901)
would logically be made of the same material as the one at the rear. If
you have the front gasket, that may be the answer. You could also call
Rimmers or Canley Classics and just ask them nicely. I'd be surprised if
they wouldn't help you.

(original poster here, postin' from work)

Gotcha. I can always order another one of the 2 gaskets, seeing as
that my shortsighted self forgot to order 2 other gaskets(around the
gearbox itself) so I'm stuck for the time being. That's okay.

The car in question is a USA model '79 Spitfire. I abbreviated it LdN
as not to go overboard on the subject line.

Quote:

They look the same but the OP said they were of different materials and
thickness.

There are 2 - NKC86 (Ft) & NKC87 (Rr) gaskets which are the same shape
and go both sides of that ring (NKC10). The 37H1901 joins to the main
box, thickness is not relevant.

In the workshop manual they stress, that these gaskets are different.
(Can't locate my parts book at present to see what that has to say which
is which.)

With the brake ring /clutch / cone distance, thickness of the gasket,
may make a difference in the spring tension/clearance. The problem is
that its slow to fully engage OD.

Eh, about 1.5 seconds and it engages. I was happy with it. Either way,
I've replaced
most of the O-rings in mine. None of them looked the least bit
damaged.

I swear 99% of this transmisison rebuild is part polishing. I dared
not try to do
the bearing replacement at the annulus. There's no way I could get
those circlips off.

Quote:

You illustrated the J OD unit (late) and they had slippage problems if
they were not assembled correctly.

Both the early and late types work exactly the same way. The latter
being beefed up in size.

r

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LdN overdrive: which gasket goes where?

Classic Cars (UK) Classic Cars in the UK (uk.rec.cars.classic)

LdN overdrive: which gasket goes where? - 03-08-2007 , 12:03 AM

Re: LdN overdrive: which gasket goes where? - 03-08-2007 , 01:14 AM

Re: LdN overdrive: which gasket goes where? - 03-08-2007 , 09:46 AM

Re: LdN overdrive: which gasket goes where? - 03-08-2007 , 09:57 AM

Re: LdN overdrive: which gasket goes where? - 03-09-2007 , 09:27 AM