thrust washer failures due to clutch pressure.
Turbo Mini Forums

I was thinking about this today at work,

Some of us have had thrust faliures due to the heavy grey/double grey pressures exerted against the thrusts,

Is it reasonable to assume that when the clutch is pressed with this kind of pressure that oil is finding it difficult to maintain a film between the thrust and crank?

If so, could it be benificial to drill through the thrust into the block and intersect with the centre main oil feed to "inject" oil onto the thrust/crank in a similar manner to the crank journels?

what do you think folks?

http://s24.photobucket.com/albums/c2/carl1...lfedthrusts.jpg


you meen like this,

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LOL!

I mean exactly like that!

is that something your using to good effect or is it another excuse to loose a few grammes.

Edited by Joe C on 11th Jan, 2008.

It was in the DON all last year. Thrust doesn't look too bad does it.

What a smart idea.
It doesnt really effect the surface area that touchs the crank either.

Back once again like a renegade master

cheers carl,think il be doing this on my engine at some point....

what size hole is that tom ?
looks a tad large
looks like a cure there for the wrong reason

i think this will be widley adopted across the board now!

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I'm interested to know why you used the screws.

After all, the standard thrust bearing cannot move very far.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Paul, if you look at the ends of the washer you will see why.
Regards
Dave

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE

Well, Interesting stuff!!

I had thought about fixing the thrust down to, the idea being that it would prevent the oil film going behind the thrust.

Was it because the top half is self locating instead?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Had to nip out to buy a guitar for the sprog.
anyway carl how does this sound.
1) The screws prevent 60psi oil pressure behind the top thrust washer which would put pressure between the bearing face and crank all the time the engine was running.
2) The ends of the top half look to be chamfered to allow more oil to the bottom half of the thrust washer and as a result, unless they were screwed in place there is a danger that they may slide under the bottom half.
3) I assume you only did one side?
4) The only thing I would have done additional to that would have been to put a tapered groove from the hole to just short of the inner and outer edges of the top thrust. This would help the oil over the full with of the face. (nit picky I know)
Dave

1: Makes perfect sense.
2: standard!

[/quote]

This is what my standard thrusts look like:-

Can't seem to be able to attach the picture i want, but my thrust bearings do not look like that
dave

Edited by danboy on 12th Jan, 2008.

its to hold it back in place as mini 13 and danboy say, prevents oil pressuse pushing the thrusts against the crank,

you you too get a lollipop the next time i see you,lol.

carl

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE

As long as its not a meat lolipop.

What a simple little solution. Quite impressed.

is yours still in bits Jason?

Yep Joe. You thinking what I'm thinking???????????

of course!!

Old news

Not the only person to have thought of it, but maybe one of the first to implement it.

My own Idea was to have a new thrust made up in bronze fixing the bottom half with one small counter sunk allen head screw, the screw itself acting as the oil feed, with a hole drilled all the way through the center of it into the mian bearing oil feed, feeding a small 'v' groove in the thrust face, all the way round. The bottom half designed to overlap the top half (lap joint sort of thing) to transfer to oil to the top half without it getting behind the joint

Maybe a bit more complex than what Carl has done, but would ensure an even film of oil all the way round.

The reason the screws are used is to keep the thrust bearing, tight up against the bearing housing, preventing the oil pressure forcing the bearing out against the crank, where this would be just as bad if there were no oil feed.

Edited by Sprocket on 12th Jan, 2008.

I like Carls method. Nice & simple. It does the job & it makes sense.
JF even told me off for starting the meccy with the clutch in. I can see why now! Bad habits die hard. :(
mini13...you got some spare taps kicking about m8y?

Edited by Jason G on 12th Jan, 2008.