SKF Dual Component Seal Fail!
or
Why Marzocchi’ Sealing is about High Quality & Sustainability!!🤙
This is what SKF is calling ‘Dual Component’ seal. And it is a single seal system means one seal ring seals the inner oil/air from the outside AND from the dust + water from the outer environment.
As you know I have analysed all Marzocchi seals, from the very early beginning with 24mm seals starting with StarFork all the way up 26, 28, 30, 32, 35, 38 and 40mm Seal kits. I did this by buying dozens of seal kits from all brands, I compared materials, flexibility, cutted seals to understand the inside metal sceletons & sealing lips and I put them on stanhions to view and test sealing and friction.
So the question is : What is the Probem with this Dual Component single Seal made by SKF?
1st : Single Seal System??
_ALL_ seal kits developed by Marzocchi have separated outer dust wipers & inner oil seals. Fact.
=> And do you know why????
Because Marzocchi knows as it best from moto forks what is best in sealing.
If you check in detail you will see this seals have different geometries for different tasks they have been made for. E.g. the inner Oil Seal has to hold back Oil and needs to hold Air Pressure up to ~15bar during vertical stanchions moving. So obviously it is for sure a very difficult and risky decission to drop a 2nd seal and make both main important tasks in sealing into one seal ring only!!??
Nowadays stupid money making Fork Company’s without deep understanding of technics + simple physics try to maximize their fkg $$$$$ earns in making parts cheaper.
E.g. they reduced the seal kits into only _one_ seal!?
This will lower the production costs of lowers and the seal costs. Muha.
But most of this forks have a huge problems in quality of sealing. Fact.
You can read & view a lot of this cases @ Instagramm where superdupper Bike Mechanics in real life showing the bad forks results by showing the use of such seals.
2nd : Dual Lip System Missing in SKF Seal??
I don’t understand why-the-fuck SKF also dropped the ‘Double Lip System’ for the outer wiper!? This brand SKF new seal with it’s huge marketing efforts & blinkyblinky coloured thing is a big fail at all.
Check this photo and I can tell you from talking about in this and other postings and I know this from talks with many bike mechanics & suspension centers.
The problem is : Yes, the single lip system reduces a little friction, BUT it does not seal a ‘normal’ Suspension Fork in normal conditions like simple rain!!
I know about when I analysed the 35mm Seal SKF had created for Tenneco for Shiver DC / 66 / 888 and others. Yes : friction was o.k., but seal was such weak with the outer single lip that the sealing all over was bad as mud get’s under the out dust seal and following damages the oil seal. Wtf and what a huge nonsens!!!
What’s up now?
For the user this means they have to lower the service intervall times and if you read the manuals for modern forks you will find out that some fork brand are telling you to exchange seals (or minium clean sealing areas) in <= 50h only!!!! 50h??? WTK??!??
=> I had weeks where I rode 50h, so I have to do a service every week??? Hell, NO!!
I can ride my bikes a hole season and more with only _one_ seal kit for sure and I’m doing this since I own by 1st XC600 from 1994!
To sum this up : You understand in case of quality of sealing and of course sustainability why we all can be very, very happy to ride such rock-solid older Marzocchi Forks and I’m realy proud & happy to support all this 500-1000 different Marzocchi Forks which new seals in all sizes (1989-2018)!
(btw: Marzocchi is the only brand which get’s support for ‘older’ forks with a complete series of new seal sizes and you know the creator and seller is surely notFOX!)🤣🤙
left side : Marzocchi original SHIVER Repair Kit 850717
right side : My SHIVER Repair-Kit in the current status
WHAT DO YOU THINK ABOUT? ANY IMPORTANT PARTS MISSING? SOMETHING WRONG?
You might know about my Marzocchi Seals projects I’m doing for many years. The simple aim is to have Marzocchi 100% compatible Seals for all our Marzocchi’s. 35mm Seals have been done, 38 and 40mm are in progress now.
I did some nice Complete Kits for the Z1/Z2, including Seals, Tools and more, so my intention here is to do one Kit for MarzocchiSHIVER and MONSTER also, based on the original Repair Kits.
I thought about the parts including in this Kit and the result is on the right side. It includes :
2 Set of Seals (!)
SAG Ring
Bushings
new Bumpers
black Knobs, 2 Tools
a nice Ahead Cap with Marzocchi Logo
a full set of Screws and
some important Bits O-Rings / Security Clip
Sorry, but : No, you can’t buy it now. But soon
Sorry, but : No, I did not calculate an end price yet.
Until the Seals arrive here I will sell this Seal-Kits for a Special 🚀🚀 Price to all Pre-Sellers!!!
This is about a 100% full compatible Seal-Kit comparable to Marzocchi Art.-No. 850716/P.
It has been done by a seal specialist in Asia which produces seals products worldwide for well known automotive companies. Seals are 100% comparable with latest Marzocchi Developement Status and some minor optimizing changes.
Seal Kit includes := 2 Outer Dust Seals (classic : with edge) + 2 Inner Oil Seals + 1 Travel Check O-Ring for one Stanchion to see the compression distance (travel).
Also tools and DYI Kits will be available!
Oil and Dust seal compatibility (35mm) :
528034/B Oil seal
533167 Dust seal
850716 Oil & Dust Seal Kit – also named ‘Shiver Seals Kit’
850716/C Oil & Dust Seal Kit
»» 850716/P Oil & Dust Seal Kit ««
8507014/P Oil and Dust Seal Kit – comes with and without ‘2009’, Seal Colour is black
8507014/P Oil and Dust Seal Kit – SKF green (1 Lip on the Dust Seal only!!) (*)
8507035/P, Oil and Dust Seal Kit, replaces 850716/P, 850716, 8507014/P, red
8501402, replace: 850716/P , 8507035/P
(*) 8507014/P : green SKF Seals material is known to be good. Here is the BUT : It is the meaning of many Bike Shops and my own, that the green dust seals 8507014 are not they good as the 850716 ones from Marzocchi. For some reasons SK# dropped the 2nd inner lip which is used to protect the incomming of outer dust. I think they did it for gliding and friction purposes and for sure for some marketing hypes. YES, the green SK# has less friction, BUT it does not protect that much against outer mud any more!! 🙄⛑🔧🙏 As this (the 2nd lip) is some of the most important features in ALL older seals types – which has been copied by various other brands and seals types – and as I have seen such green forks with lots of mud inside I decided to go the Marzocchi style including the 2nd lip!!🦾
Another Custom Retro Rebuild-Kit for Marzocchi XC100 sold to Luis in Mexico. 🎈🛠🔧
The kit also includes screws and my Air Cap Puller Tool to handle the Air Cap without damages. 🙏🦾
Marzocchi XC100 is a fork from 1991/92, very rare. As most of the Marzocchi’s around that years it has 51mm travel and Oil- / Air Suspension. The sliders are anodized. You can adjust by Oil-Level, Oil-Type and Air-Pressure, you can find a Manual in my Marzocchi Manuals Repository.
A very tricky detail is the second security ring under the Oil-Seal – it’s the only Marzocchi Fork which has this unique Feature making people going mad during disassembling 🙄😉⚒
The 2nd picture shows a nice XC100, it is not the one from Luis, but hopefully his XC100 will look like the same way that good! 💎🎏
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