Cluch Oil Seal
Turbo Mini Forums

Hi Wondered if you could give me some expert advice.

I have replaced he oil seal on the car for the last two years. Yet it is still leaking oil, this time quite badly. I have taken some pics below. This time last year I replaced the oil seal for the minisapres orange one and even baught the tool to make sure it was on square.

The oil thrower looked clean
The clutch plate had damp spots.
I put an extra breather this year on the dizzy blank plate as my 998 doesnt have one on the clutch cover.

I'm wondering if the primary needs replacing? the pic shows wear marks and it have a healthy amount of oil on the inside. I never felt any side to side movement when it was on the crank with the C washer.

Its a PITA pulling the clutch off in the car....

Thanks for any help.

Graham

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

What is the bush at the engine side of the primary gear like? That one will allow more movement than the front one (which looks OK to me).

Here is the pic from the other side. I didnt feel and movement on the crank?








The oil feed holes look very close to the seal wear lines? I cant feel the wear lines with my nail so it cant be much but then maybe it doesnt need much?

Edited by gr4h4m on 8th Jan, 2012.

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

I meant the bush inside the primary gear

What condition are the oil seals in when they come out? Any damage or obvious wear?

Opps sorry mate, The seal looks good, i just doesnt seem to be doing its job...

These any good I cant see any scoring they look quite good to me but then I dont know shite about primary gears..

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

They look OK to me. Is the hole in the transfer case OK?

Is the bush worn, allowing the primary gear to move about?

I have been out and measured with a feeler guage between thrust washer and primary.

I get 0.20mm. 0.25mm is very tight but I can force it in if you know what I mean.

Looking at the internet the gap is a little big?
I have read it should between 0.004" to 0.006"

I make mine 0.0078"?

Not sure what I should change

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

Measure the C clip and it's thrust do dah. We found the one on the van was worn and allowing the primary gear to move about more than is desirable. I should have a couple of 998 ones throwing round I can measure for you if needs be.

the bronze thrust washer measures 0.1155"

The c-clip measures 0.124" and the ring bit measures 0.159"

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

I need to get another set of feelers as I could only measure with one set which might be getting a false reading.

You can feel a small ridge on the primary where the seal sits so I might order a new one. I cant face taking the clutch off agains its a PITA.

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

Ok armed with two sets of feelers I measured the float to be 0.004" so that looks within spec.

There is a groove where the seal sits on the gear.

The case looks ok but there are two screw driver marks where someone else had removed the original seal.

I'm starting to think these so called updated red super duper seals are not as duper as the web sites have you believe?

On advice from Simon I've ordered a mini speed super super duper seal. I'm going to gt a new c washer as mine has a coupld of marks on it and whilst I'm ordering stuff from minispares I will get a standard seal so I see what that looks like on the gear.

Then I will chuck it back together for 2012...

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

I've got a spare a series 1275 transfer housing (extra breather might be useful) if you want and probably 998 a transfer gear or two.

Good point andy!
Is there a breather on the flywheel housing/is it blocked?

Thanks Andy, but I cant face stripping the engine. Its been bolted together since about 1969, I have always felt that if I strip it it should be to rebuild as oher wise its not realy worth the hassle? Thanks for the offer, the gear looks ok and I'm nit picking realy.

Intrestingly the seal is marked in mm

NAK SC 55 70 10 3

I would have thaught it would have been in old money?

Anyway some searching has found a double seal version in the same size. I'm guessing that the minispares uprated it verton rubber where these are just nitrile, however I havent had much luck with Verton style I might order one of these and see what the fit is like. The dust seal must be a good idea from the clutch point of view? the sealing edge on my old one is black I presume from heat or clutch dust?

clicky below
http://simplybearings.co.uk/shop/p27389/55...oduct_info.html

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

The transfer case is just sat in a box in the shed if you change your mind at any point.

Thank Andy


Nic it doesn't have one as it's an old 998.

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

I have a new primary gear I could measure the bush/outer diameter if that's any use. I only have a vernier that's accurate to 0.05mm though.

I had it from minispares. I can't comment on how well it works yet as my engine is in bits!

I think an extra breather at this end could be a fix.

This is on a supercharged engine isnt it? I would presume with the extra power it will want to breathe a little more and at the moment it may be pushing past the seal in desperation

sounds plausible. It's only a hand full of bolts and a gasket to change it...

Minivan yes please if you could measure it it would be great.

nic Andy, it's an engine out job isn't it? I have put a breather in the dizzy blank. Thinking it would help.

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

If you've got the clutch out with the engine in, then the transfer case should be a piece of cake.

Andy I can't see you getting it past the crank with the subframe in the way. I'm also worried about what it will find behind it. I imaging springs, cogs, ball bearings and magic wizzardry holding it all in the right place. :)

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

Nope, it just lifts away. You'll get it of if you lift that side of the engine as high as possible.

Inside there are the idler gear which slides out, bush on either side of that and a gear attached to the box. piece of cake.

I've measured the new and an old primary and there is no difference with the measuring gear I have. Ideally need a micrometer.

Bush diameter inner is about 38.15 to 38.20 mm both ends. Where seal sits is 54.95 to 55.00 mm.

There is a ring between teeth and where oil seal sits on the new one as shown in your pic, but not on the old one. I'm guessing this was added to stop oil splashing onto the seal from the gears at some point.