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When is an o-ring not an o-ring ?

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td5_pete
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When is an o-ring not an o-ring ?

#1 PostAuthor: td5_pete » Thu Nov 15, 2012 10:46 pm

I just removed the oil cooler, and crankcase feeds from my z1000 A1 as I want to return to the standard oil pressure switch housing.

Is there anything special about the o-rings that seal it to the case ?
I couldn't work out if they had a flat profile because they've been compressed for 30 years, or if they're meant to look like that. :D

Will any new o-ring of the right size do ?

I was going to buy a 440 piece o-ring kit so I'd always have a stock in the workshop, but I see I can pay from £6 on eBay to £50 for o-rings made from 'viton' .

As far as I can make out cheap = made from 'nitrile' and good to 120c.
Expensive = made from 'viton' and good to 200c.

What are you supposed to use in bike engines ? Can't seem to find the answer anywhere else. :roll:

Thanks for reading.
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z1bman
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#2 PostAuthor: z1bman » Thu Nov 15, 2012 11:40 pm

part no 670B2018 still available from kawasaki
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#3 PostAuthor: Ginger Bear » Fri Nov 16, 2012 7:44 am

Pete, new ones will have a round profile, as you suggest 30 years + will have left them a little flat.....
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#4 PostAuthor: jimmock » Fri Nov 16, 2012 10:02 am

Surely you wont need 440 O rings to fix the problem??
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steve bowdler
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#5 PostAuthor: steve bowdler » Fri Nov 16, 2012 11:45 am

jimmock wrote:Surely you wont need 440 O rings to fix the problem??


When I saw Jimmock had responded to this question I was afraid to open up the subject especially in work :lol:
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#6 PostAuthor: jimmock » Fri Nov 16, 2012 12:17 pm

steve bowdler wrote:
jimmock wrote:Surely you wont need 440 O rings to fix the problem??


When I saw Jimmock had responded to this question I was afraid to open up the subject especially in work :lol:


Wise move Steve,

Guys have been sacked for less!!!

As you know, I search the site constantly for engineering problems that I can offer engineering solutions to.
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#7 PostAuthor: StevieT » Fri Nov 16, 2012 8:11 pm

Viton is a flurocarbon rubber and probably 'over engineered' for any standard road going air cooled Z. It's used where maximum resistance to elevated temperatures are required. However it has a low compression set so won't exhibit the problem you describe.

I doubt Kawasaki were using them in the 70's or early 80's though!
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td5_pete
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#8 PostAuthor: td5_pete » Fri Nov 16, 2012 10:07 pm

StevieT wrote:Viton is a flurocarbon rubber and probably 'over engineered' for any standard road going air cooled Z. It's used where maximum resistance to elevated temperatures are required. However it has a low compression set so won't exhibit the problem you describe.

I doubt Kawasaki were using them in the 70's or early 80's though!


Cheers for that ! - makes a lot of sense. Always happy to save some money
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#9 PostAuthor: DogsbolloxofZ1B » Sat Nov 17, 2012 7:22 pm

Viton range of 'O' rings, for the most part, are dimensionally the same as OEM whereas rubber ones aren't. You can normally find a rubber "O" ring in a kit with same OD but its CS is not the same normally smaller in Cross sectional diameter.

My two cents, take a look at: http://www.polymax.co.uk/o-rings/rubber ... s284-viton

Mike
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KeithZ1R
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#10 PostAuthor: KeithZ1R » Sun Nov 18, 2012 1:09 am

Good info but do they work the same ?
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