I just did my second valve adjustment (12,500 miles since the last; 125k mi total) and pretty much all of them were still adjusted correctly. I did tweak a couple, but there's no guarantee that I didn't mess it up a little the first time.

What are others' experiences? Do you need to actually make adjustments frequently?

TIA!

 

On my first adjustment I found almost all of them but a few had a smaller clearance than .004 and only 1 was loose and the rest were right on. I'm curious to see what my next adjustment will look like. I'm not sure how long it had been between adjustments when I did it since I had just bought the car and there wasn't any proof of adjustments in the paperwork I received from the PO.

 

I find that the valves haven't moved much. I've gotten to where I can rattle the rocker and hear if its too tight or too loose. Majority of the time, the valves haven't changed.

 

Exactly what my very, experienced mechanic said to me a couple months back after adjusting my valves (@ 15K interval).
That was good for me to hear, as I'm hoping the stars align next time and I can attempt to do it myself.

 

mine were loose but I don't think it was ever done in the 20K after the rebuild, at least no record of it.

 

If 80 % of the use is track, would the same results be had as above?

Track car interval--same as factory interval?

 

I don't think that mine had been done in over 20k when I bought the car and I didn't find any that were out. Every 12k could be unnecessarily excessive.

 

Obviously not on my 993, but on my other vehicles, I record my as-found valve clearances before making any necessary adjustments.

Over time, my records will indicate if I can extend my valve adjustment intervals. That saves me time and concern.

Loose valves aren't an issue; tight ones are.

 

Thanks for the responses so far; given what I found and what others are reporting I think that my next adjustment interval will be larger than 12.5k.

Which is good; it's kind of a pain to do.