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ss396si 04-23-2013 12:00 PM

454 umbrella valve seals
 
1 Attachment(s)
This is my first build. I have a 454 w/781 heads and dual valve springs .im having a problem installing valve seals. Now I slide on the umbrella valve seal( comp cam 504-16) for the intake valve. It fits on nice and tight but the base of the seal does not reach the base of the retainer. Where the spring sit. Is this normal?

68NovaSS 04-23-2013 03:23 PM

I don't see the seal in your picture, what am I missing?

ss396si 04-23-2013 03:26 PM

Quote:

Originally Posted by 68NovaSS (Post 1669635)
I don't see the seal in your picture, what am I missing?

I didnt take a pic of it with a new seal. The seal looked to short like it wasnt reaching the seat. Would the umbrella seal be fine over the valve stem?

oldbogie 04-23-2013 04:23 PM

2 Attachment(s)
Quote:

Originally Posted by ss396si (Post 1669575)
This is my first build. I have a 454 w/781 heads and dual valve springs .im having a problem installing valve seals. Now I slide on the umbrella valve seal( comp cam 504-16) for the intake valve. It fits on nice and tight but the base of the seal does not reach the base of the retainer. Where the spring sit. Is this normal?

Umbrella seals are not so much a seal as a shield that rides on the valve stem to deflect oil away from the stem and upper guide. It is not intended to cover nor attach to the upper guide. See first attached picture.

Items that actually make a seal between the stem and guide require the guide OD be machined to a specific diameter, they then slide down that machined surface and are friction retained by a metal clamping device. The stem fits through the seal which wipes the stem but does not ride with it.
See second attached picture.

Bogie

ss396si 04-23-2013 04:40 PM

Quote:

Originally Posted by oldbogie (Post 1669655)
Umbrella seals are not so much a seal as a shield that rides on the valve stem to deflect oil away from the stem and upper guide. It is not intended to cover nor attach to the upper guide. See first attached picture.

Items that actually make a seal between the stem and guide require the guide OD be machined to a specific diameter, they then slide down that machined surface and are friction retained by a metal clamping device. The stem fits through the seal which wipes the stem but does not ride with it.
See second attached picture.

Bogie

Thank you, all I have to do is slide the seal on the valve stem down to it stops at the upper guide.


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