SOHC.co.uk Forums > Anorak's Corner

tappet cover o ring size

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Nurse Julie:
I sell them in Nitrile and a % of all my sales go to run this forum. I've sold thousands of them and we also fit them to all our own CB SOHC 4'S. Viton shears too easily for this application

exvalvesetdabbler:
Ease of compression depends on the hardness.  Shore 70 is the norm for most stuff.  When I worked  we would use SH 70 Viton on underwater housings rated to a few thousand meters water depth. A bit of fluff or debris during assembly was the biggest risk.

Regards
Dave

exvalvesetdabbler:
New o rings dropped through the letter box today.

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They seem ok to me.  Only time will tell after a good soaking in hot oil.

Screw in finger tight, then about 3/4 turn with a socket until the caps bottom out and tighten.

Regards
Dave

Nurse Julie:
Are they silicone?

exvalvesetdabbler:
Too hard for silicone.  They're sold as fkm though they could be hydrogenated nitrile as some manufacturers use green for either.

The main point of green is to differentiate from nitrile or Edpm in production environments where using a standard o ring could cause a disaster or be short lived.

Hardness is on par with shore A70.

Regards
Dave

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