25 replies to this topic

[nicklouse]

Never looked at a Verto setup till this job. Now the "fingers" that get pressed on what is acceptable wear?
This is the item in question.


Like I say I know diddly about them.

[Magneto]

Could that be a bad release bearing? I think I'd change that pressure plate, that looks like a lot of wear......

[neal]

Looks knackered to me mate, looks like a big ridge there, change it!

[nicklouse]

Looks knackered to me mate, looks like a big ridge there, change it!

Yep ridge. Just what I needed to know.

May as well get the MiniSpares lightend flywheel at the same time.

[neal]

It could be just worn out after many wonderful miles, someone riding the clutch with a lazy left foot or poor adjustment, either way change it.

 

While you're at it I would check all clutch operating components for general wear 'n' tear and some fresh brake fluid, then you can tick this one off your list.

[neal]

 

Looks knackered to me mate, looks like a big ridge there, change it!

Yep ridge. Just what I needed to know.

May as well get the MiniSpares lightend flywheel at the same time.

 

 

 

Get a good quality clutch mate, you only gets what you pay for. But do look out for them robbing B*****DS.

Edited by neal, 23 October 2016 - 11:28 PM.

[tiger99]

There is a fundamental problem with the Verto clutch, which runs with the release bearing in constant light contact. I became aware of it when I was thinking about using a modern direct acting hydraulic system. Basically the clutch fingers are running relative to the crankshaft centre line but the thrust bearing is centred on the plunger in the wok.

So there are many tolerances involved. Crankshaft to transfer case locating dowels, fit on dowels, inner to outer side of transfer case, fit of wok to transfer case, concentricity of wok, fit of plunger to wok, concentricity of bearing mount area of plunger to sliding area. We might see a thou at each in good conditions, which in the worst case when they add makes 7 thou. For old, worn or slightly distorted parts (but not visibly so) it could be a lot more, maybe approaching 1mm.

That makes the thrust bearing shuffle about against the clutch fingers at all times that the engine is rotating, which will cause wear.

Note that on pre-verto clutches there is only contact during the relatively short time that the pedal is pressed.

This may be one reason why so many people swear by pre-verto clutches. They are far more tolerant of misalignment.

I suspect that someone will devise a means of correcting thrust bearing alignment if the problem becomes more common. Possibly a device that centres itself on the crankshaft taper and locates the wok centrally while new dowel holes are drilled at both sides of the transfer case might be the way forward?

Now I can't prove that lack of concentricity of the thrust bearing is the cause of excessive wear in this case. I will leave it to you all to have a think about it, and maybe contemplate things like how accurately your wok fitted last time it was off. Was it tight or loose on its registration lip?

[nicklouse]

interestesting read. My first Verto and on top of that it is a cable operated one.

Just need to find somewhere that can balance a new Assy.

I really would have thought that the supplier cook have had it balanced as I will be ordering a short motor and head at the same time.

Of to see a engine shop early doors to ask. Who knows they may even get the whole job.

[Magneto]

Why does the thrust bearing ride on the pressure plate, don't Verto's use a return spring on the clutch arm like Pre-Verto's?

[Dusky]

Nope.
In fact there is a Spring in the slave cylinder that slightly pushes the arm at all Times.

[Spider]

I suspect that someone will devise a means of correcting thrust bearing alignment if the problem becomes more common.

 

There is a tool for this and sorry, but I just took this as part of normal assembly to align it all with the tool.

 

How do others do it?  Just bang the clutch cover on?  Gosh, I hope not,,,,,,

[mini13]

erm,

 

i've never seen a verto where the thrust bearing acts against the fingers. thats what the top hat is for which self aligns (ish)

 

also the release bearing is semi located on the plunger so it should centralize the first time it is used.

[Dusky]

Thé tool ... :)
http://www.minispare...|Back to search

[tiger99]

Can't access the link right now. But to avoid confusion, the top hat is indeed an extra layer which I forgot, and it will be shuffling against either the fingers or the thrust bearing, or maybe both. And the centering required is of the clutch plunger with mounted thrust bearing with respect to the crankshaft.

I will try to access the link from a real PC when I get home, to see what the tool really does.

Oh, and it will not self centre. There is no mechanical incentive for it to do so. What self-centre on all cars is the clutch friction plate first time you press the pedal. It usually needs a centering tool to get it about right to allow the engine and gearbox to be mated.

[nicklouse]

it is a tool for centering the cover on the crank.

 

Pre Verto.  allowing the cover to be drilled and doweled.