Yet Another Valve Stem Seal Question (1 Viewer)

[stoshzack]

Hi All -

I did review the other posts on the form regarding this prior to install.

I went to replace my valve stem seals today on my 1970 FJ40 (i.e. F155). Got to the first one, and I have two questions.

First, the oem seal is the umbrella type. It is hard as a rock. I am assuming that when originally installed, it was a pliable rubber. Is that correct?

Second, I ordered the newer style seals from Rock Auto (with the spring around top). I read in another thread that the seal should "slide" on over the stem base. They do not really "slide". I have to tap them down with a socket to seat and it is a pretty tight fit. It took a little persuasion (i.e. prying) to get it back off (thankfully they came back off). Is this pretty normal? I might just go with the 2F OEM seal route if people have success with that. I don't want to do this again any time soon.

Thanks for any help

 

[45Dougal]

I've never done them on the 40, but they are usually rock hard after many years of high temperatures.
New ones should be a snug fit - if they're too easy to fit then they leak.
Oil the stems lightly to ease assembly, but the valves should be able to open and close once assembled - how tight is tight?