Flying Finn

I think to accomodate tolerances in cam housings but I'm not sure. You'll get the part numbers on old lifters, Bob surely knows.

I got the lifters for exhaust side but I haven't changed them yet. I just ordered the "standard" size and am hoping they are the right size, with my luck...

cowtown

From reading the shop manual, it seems that standard size is used in all cars until a rebuild. And I never was able to find part numbers on lifters, old or new. It appears you've got to measure them if you suspect a rebuild was done and you may have the non-standard size.

Take a look at this from the shop manual:

pcar964

Finn, are your lifters making any noise currently, or are you just doing it ahead of time?

Edward

Hmmm, different lengths and measuring for lash? Interesting. When I did mine many, many moons ago, I had no options as to length, nor did they stock anything else than "993 lifters." From what I can infer from the manual page, the diff lengths are to accomodate head work performed (as per first line). A stock valve train (I would think) would fall within a spec range that hydraulic tappets can accomodate since they, by design, extend themselves to provide zero lash.

As for pumping the adjuster, yes, I had done that on motorcycles years ago: it bleeds them of air and primes them for faster response once the engine is fired up. But when I did my 993 hydraulic adjusters, I remember them not being compressable ...maybe that's my failing memory. Not to mention that some here are advocating "soaking" them ...sorry if I misunderstand, but taking a bath in 15w oil is a far cry from pressurizing them. We need a knowledgable 993 wrench here to answer this definitively so as to avoid spreading mis-information ....Steve W., you listening??

Edward

whidbey

I found this hope it helps.
https://rennlist.com/forums/993-forum/199508-valve-noise.html

Flying Finn

I have one right bank exhaust lifter that has made noise couple of times after a long hiatus (i.e. 1 month in summer when I was in Europe) but other than that, my engine is quiet. Knock on wood...

I bought 12 lifters just in case and will do them ahead of time, when I find time to do them , or when it/they start to make noise.

Droops83

You are correct, I should have clarified. We usually soak them in an oil bath that is heated so that the oil thins out. You can watch the air bubbles escape and when no more come out you should be good.


---Chris A.

Drifter

From a previous experience, not on a Porsche, a ticking sound that appeared to be a lifter/valve ended up being an unexpected cracked exhaust manifold.

geolab

When my car was under warranty, I complained about the ticking noise and oil dripping. So the dealer changed all the lifters, rocker arms, etc. and resealed the whole engine.
I saw them dipping the new lifters in diesel fuel for a second before inserting them, don't ask me why.
After all that, the ticking remained. They said it would vanish after 500 kilometers.
50000 kms and it is still there.
ie: even after the dealer did the job, mine is still ticking too

pjc

Had all my lifters replaced at 50,000 miles - 2,000 miles on and one started 'ticking' again on start up after leaving in garage for a couple of weeks. After driving for a short while it stops - only happens now and then but a real nuisance and now I listen for it every start up. Who said the 993 was the best 911 - can't agree ar all after the work that I've had to put in to mine but once you've spent the bucks........

PJC

pcar964

I must say noisy valves really put a damper on the enjoyment of the car. Annoys the crap out of me.

Flying Finn

Are you guys sure your ticking noise is not the normal ticking noise these engines have?

Air cooled Flat-6 engines always tick a little, same way old VW beetle engines do.
I know some of you kow that but I'm thinking maybe some of you are not used to it if you haven't had this type of engine before and think something is wrong when in fact it's just the normal "VW Beetle tick".

pcar964

I was thinking the same thing when I read the above posts.

chris walrod

Get a newer model, and you'll be tickled to see an engine make it to 50,000 miles. Better yet, work on a few 993's, then on new models and you will very quickly see differences why so many love the 993.

pcar964

+1