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In case anyone is interested. My 64 is using way to much oil. Did a compression and leak down test and all numbers are good. It was rebuilt by me about 8000 miles back. I decided to pull a valve spring and check the seals and mic the guides to see if I could get a set of positive stop seals to fit. No such luck. I had a set of seals in the attic that came with a overhaul gasket set from Best gaskets that I bought to get their head gaskets valley pan gasket and valve cover gaskets.. When I rebuilt the engine I used fa fel pro set of gaskets. The umbrella seal on the right is the Best seal, the one on the left is the fel pro seal. With the fel pro about 1/2 inch of the valve stem can be seen. With the Best only about 1/8th inch or less of the stem can be seen under the seal. I am going to put the Best seals on and see if this will slow or eliminate the oil consumtion I am having. With a much smaller gap for oil to drown the valve stem I am hoping this solves my problem
I'm not so sure I have this correct but I'll put it out there and hope it makes sense.
I was looking at the parts lists and the illistrated parts catalog and it looks, to me any way, that your pictures of two different parts are not pictures of valve stem seals. your parts in your picture have part number 6550 (see illustration) but the valve stem seal part number is 6571. I'm adding pictures to show the different shape and location of your 6550 cap compared to the 6571 valve stem seal. If you don't have the 6571 seal in place, that would explain the oil leak. Hope this helps.
The valve guide seal (umbrella) goes on the valve stem under part 6514. 6571 says it is a valve stem seal but I don't think it is shown in the correct location and the depiction of it is not very good. The picture of the seals I posted the diameter is between the size of a nickle and a quarter. The height is about a 1/2 inch for the one on the left and about 7/8 inch for the one on the right. These seals go over the valve stem and inside the spring. Since that part number list shows years as 57 to 59 maybe something changed after 59. I have seen that type of seal (6571) in some old engines and I have been told they were prone to breaking and not doing the job. The umbrella seal fits snuggly around the valve stem to prevent oil from running down the stem and the skirt on the umbrella prevents an excessive amount of oil from getting on the stem. I don't know, it is kind of confusing
Yes to what you said. Everything goes below the keeper which locks into 6514. I believe that the screenshot below is the napa version of your seal. It is 0.82 OD and .315 ID. Napa has another style seal that, possibly, would seal better? Anyhow, I haven't helped you at all chasing rabbits. And since I haven't helped, I thought I would strike off on another tangent... You said you were loosing a lot of oil. So, I wondered if you had blow-by which would come from worn valve guides which is where you started at in this post, but then that would allow oil in the combustion chamber as well. Enough said.
Last edited by ManFordman2; Sep 12, 2023 at 06:23 PM.
Reason: Adding more info
The second seal that you show is the positive stop style. Those are what I would have liked to use but the heads would have had to be pulled off and the guides machined down to use them. The leak down test pretty much eliminated blow by. I am convinced the oil is getting down the valve stem. When I was changing the seals I wiggled each valve stem to see how much movement there was in them and there was very little. The stems did have a ton of oil on them though which would get down the guides into the cylinders especially on acceleration. I got all the seals changed yesterday. Now it is time to put some miles on it and see if the oil consumption goes away and the spark plugs stay clean
From everything you mentioned, it certainly does seem that those umbrella seals are the culprit. Unless of course, there is a gremlin somewhere that you haven't noticed yet. Hope you got her fixed.
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