I'm stuck, my little green o-ring use to seal the case halves bolts and keep them from leaking, are gone. I guess they grew legs and walked off. what ever happened they are gone and I need them. If anyone has some (7) please tell me your price shipped to Missouri. I prefer pay pal.
Also what produce should be put on them when installing?

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Stoddard has them.

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Cliff Murray

 

'55 Cabriolet Racer

'57 Speedster

'59 Sunroof

'63 Coupe Pushrod GS 2133

'67 911 S

Richard-Try McMaster Carr (M-C). Case 10mm bolt "O" rings: 2x8x12 RED (Silicon) M-C 5233T52, 50 for $9. Curt

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Vern,

If by "produce" you mean dressing or gasket sealer then the answer is absolutely not ! However you should coat each o-ring with engine oil before installation. I also in addition put a drop of oil in the o-ring seat and the bevel side of the washer just for good measure. This will insure that the o-ring will seat itself properly and not be torn if the washer turns while torqueing the ”through bolt“ nuts.
Installation of any o-ring should be done with lubrication, oil or grease depending on the application. O-rings by design seal variable interface joints in that they are able to move with the joint as it expands and contracts either by thermal influences or mechanical.

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Ace Hardware sells them but they will be black and better quality

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Tim Herman #2197
www.carreramotorsport.com

Better qaulity than Stoddard's or McMaster-Carr or either?

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Thanks Tim
I'll go there first tihing monday.
And thanks all

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Larry,

I have not bought any from Mc-C so I am comparing to the Reinz pieces which tear easier than the black ones I get at Ace Hardware.

For me Ace is the nearest experience to old-time hardware stores since they've all closed up now in my local area. Good hardware stores and junkyards (wrecking yards for you left-coasters) are my favorite places to be. My Ace has great, helpful people, huge metric selection including stainless, Ace brand Light Grey rattle can just right for fan shrouds...man I want to ge there right now...

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Tim Herman #2197
www.carreramotorsport.com

Hi Richard
The green ones should be made of Viton which is better than Buna N or Silicon rubber. to properly install these you have to have the special washers that have a champher on one side. I use O ring grease like Dow 55M for lubrication.
cheers
jacques

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Tim,

It must be nice to have such well stocked hardware store close at hand, I am envious. Here in Roanoke Rapids the situation is a little less up to date ! The old time hardware store still exists but is stuck in the early 20th century. Great if you need hardware for the house, tractor, fence, etc. but a little short on metric o-rings and such ! The Lowe’s does have some metric hardware but generally I keep a stock of such just because I am used to not being able to get it locally.
I have not been to Hickory in a long time and did not realize it had become so metropolitan.

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Tim-For your reference, Buna N is rated for temps up to 250*F; V=Viton rated-40 to +400*F, shore A-75; Red=silicon, -60 to +450*F, Shore A-70. McMaster Carr stocks the 2x8x12 "O" ring in viton, in addition to silicon, but I'd use silicon. Curt

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OK, Curt why do you like the sillcon o-rings better ?

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Thanks for the answers
Now new questions
silicon or not
grease, silicon or oil

Great discussion and great information.
Richard

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A couple of recommended lubricants for the Flourocarbon (Vitone) O-rings is Dow Corning 55 or the Parker Super O lube.
I'm with Jacques, I like to use the Dow Corning Molykote 55 as I obtain exceptional results with this product.
Using the correct O'ring grease assures a good seal and goes beyond protecting the o'ring past the initial installation as opposed to using oil. The Dow corning 55 maintains the O'rings dynamic properties and protects it from the effects of aging/oxidizing degradation. If you simply use oil to assemble your O'rings it works but, simply put, it's not the best approach.

http://www.anchorrubber.com/specialty/parker_o-lube.pdf

I know several of the members on this board know this already but just thought I'd mention it.
The trick to minimizing or preventing the case O'rings from being extruded or cut during engine case assembly is to fully seat the case halves prior to installing the O'rings with the correct nuts and beveled washers. Then one by one remove the case nuts, lightly lubricate the o'rings completly with the Dow Corning Molykote 55 and then slide on and fully seat the O-rings followed by installing the correct washers and torque away. Hope that makes sense.

There are definately several techniques and neat products out there in order to build and assure a nice dry leak free motor.

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Ralfy

I'm sure the Dow grease is the greatest thing in the world to lub o-rings, however the 0-ring must be compatible with the medium it is sealing, thus engine oil must be good on these o-rings for installation as that is what they will see throughout their life time ! Just to underscore my point let me point to the Parker o-ring lubrication article sited by Rafael Quepons wherein it states:

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