mondial clutch slave cylinder

The are all the same
The diameter of the piston should be 20.6 mm or 13/16"

This is the same cylinder in either a Fiat or a Bosch box
FIAT 46835408 or BOSCH 0986486573

It's also listed on my Part Cross reference list
Part cross reference | My Ferrari Mondial 3.2 (mymondial32.nl)

 

Do you need to replace the complete cilinder ? Did you look if the seal is bad or the inner cilinder is pitted ? You can replace the seal with the cilinder in place. Just working from the underside...

 

What Guido mentioned is certainly less expensive and I would go for that way if your cylinder has 2 seals on the piston. However, most old original ones have only 1 seal. When you have 2 seals it take significantly more time that the start to leak.

When the seals are bad you often need to hone your cylinder a bit as well else your seals start to leak again very shortly if the surface is rough. The took is also not expensive and still cheaper then a whole new cylinder.

Guido has new seals that have a perfect fit!

 

I replaced the whole thing on mine, price sure went up since then

Centric 136.02001 Premium Clutch Master Cyl https://www.amazon.com/dp/B000C022M2/ref=cm_sw_r_apan_glt_fabc_VVRDEWWYQMMB0P53JHV5?_encoding=UTF8&psc=1

 

Seals I have is only for the single seal slave cilinder. For the master are 2 seals needed, also available.

 

I was planning to use the slave cylinder seals from Guido/MvT earlier this year for my '88 3.2, but unfortunately needed the parts quicker. I ended up going with a Superformance slave cylinder that was here in 2 days for $100 US. I cross-referenced the part when it arrived and it's actually the same as the Lancia Integrale slave cylinder that Deltaworks UK sells for $33 (without shipping) - https://deltaworks.uk/products/clutch-slave-cylinder-integrale-and-evo .

2cam

 

Great find, just ordered a spare.

 

I added it to the Cross reference list

 

Did you measure the diameter of the piston ?..

 

I'm afraid the diameter is not correct. The diameter of this one is 25,4mm and it should be 20,6 mm
It is actually the one I have on my Alfa 156 I see, which I know is 25,4mm

 

That I was afraid of...not good for the correct working on our car.

 

So does that mean the Superformance one is not correct? The same Magneti Marelli part?

 

I'm not sure what the actual inner diameter of either the Superformance or Deltaworks slave cylinders is. However, the part that I ordered (and installed in my car) from Superformance is part number 107867/A. When it arrived, it was in Superformance packaging but had a part number stamped on the outside of the slave cylinder. When I did a Google search for the part number, the Deltaworks Integrale slave cylinder was a match. Am I 100% certain that it's the same ID? No, but looking at the pics of the Magnetti Morelli slave cylinder on the Deltaworks site (and also on eBay where they have them listed), it has the same part number stamped on it and looks EXACTLY the same as the part from Superformance. I did need to reuse the boot and pushrod/linkage from my old slave cylinder on the new one, but it works perfectly. The clutch actuation feels as good as it did previously.

For the price, it's probably worth picking up one of the Deltaworks slave cylinders to compare.

2cam

 

You're welcome!

Yes, they look the same and have the same dimension from the outside, but like Guido said the diameter of the piston is importand. It will work, in the beginning, but when your diameter is bigger the push is smaller. That means it looks over time that your clutch is worn (slipping), but infact it is not. If you were to install the correct one your clutch will not slip anymore as it has a greater push.

I'm very curious what the diameter is of the one you ordered.

Well I think it is the correct diameter SF has as Bell Bloke also installed it and I am very sure he measured it, but the only way to know is to measure it.

 

Just replaced the seal in mine not too long ago. Be sure to hone it out. AW P/N in the picture
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what is the size of that hone?

 

Or, you put the seal in the slave in reverse (with the lip opening to the wrong side)...or that seal is shot again,
or, look if you have a leak on the right side of your pedals....then the seal with lip in the master is shot,
or, the donut seal on the master is'nt closing the 4 little holes on the piston.

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Get one of these. You'll thank me later...
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I don't want to sound dumb here, but there are several threads about replacing the Mondial master and slave cylinders, and people often reply that these commonly available Fiat (or Alfa, or Bosch) parts will work instead, and then other people come back to say "they may LOOK the same on the outside, but the diameter of the cylinder and piston are smaller on the Ferrari, so if you put the Alfa slave in, the clutch rod won't move as much."
Is it BOTH the master and the slave that are the problem? In other words, do both the Alfa master and the Alfa slave have a bigger diameter than the corresponding Ferrari units? If so, can't you just replace both of them? If the master cylinder has a bigger diameter, then each push of the pedal will move more hydraulic fluid through the line, but the bigger diameter of the slave cylinder will compensate. So if both the slave and the master are replaced at the same time, then shouldn't the clutch rod move the same amount as it does with Ferrari parts?

 

I have the alfa slave installed
The dia is bigger but works fine with the original master
The alfa slave is better quality, lasts a lot longer
Never had to replace the master, the original one is still in there 36 yrs old

 

Hey, when mine failed, just honed the cylinder with a 1500 sand paper, and installed a chinese Nissan-compatible aluminium piston with double seal, and the problem is gone for less than 5 usd....