Tiha

Guys please take a look at the pics....are these two sort of valve stem seal/caps on the valve?

BillK

That is not correct. You should not have the plastic umbrella seal on top of the seal you are holding in your hand. Only the one you are holding.

The "umbrella" seal is factory but your heads have been machined for the "positive" seal like the one you are holding in the picture. That seal is much better but is used alone.

It looks like they have the white plastic ones on the exhaust valve too. You need to remove them also.

Tiha

Really crazy because it works for years…I know some positiv valve seals donīt need machining…..

How can I identify if the heads be machined for these seals…measurements?

BillK

Not really, look at how the spring has worn the black plastic umbrella.



Just pull the seal off and measure the top of the guide where the seal is pressed on. It will probably measure .500" or .530" Possibly even .560" those are the three most popular seal sizes.

The factory guides are not machined, they are cast as part of the head and have a rough surface.

Tiha

The worn umbrella is my work Bill :-) ...so in combination with a low lift cam seems to work...hmmmm

BillK

I guess it has been working that way but I certainly could not leave it like that and sleep at night. I would never want someone else to see it and ask who the idiot was that did that ?

I would take the umbrellas off and throw them in the trash.

Tiha

The umbrellas are history !!!

If i a look the guide and the measurements ( 0,570" x 0,785" diameter ) donīt look like someone prepare the head, correct?