ricks993

When I was disassembling the rockers and one these fell out I was not sure what it was. Having seen many other valve lifters on non – Porsche engines. I was surprised to see how small the 993 lifters are. After seeing them and considering the important job they do, I think they should be a standard part of 993 maintenance once the engine is over 100k miles.

shadow993

I think age breaks down the o-rings before then....especially on the bottom due to exhaust heat.

I had random lowers fail at 30k (14yrs), 40k (16yrs) and an upper at 46k (19yrs).

I hate the dreaded sound of tic tic tic! I'm always fearful that's it's somethings bigger.

geolab

do not forget to pressure blow the oil passage in the rocker itself, before putting a new lifter

AOW162435

They are very easy to replace and at this age the original o-rings crumble like over-cooked bacon.

I have a set of 12 stowed away for when the mood strikes me.



Andreas

IainM

Is this as easy as it sounds? Just fire up the compressor and some appropriately sized tuning and give it a blast?

Or is any care needed to limit pressure and filtering to control ingress of foreign matter?

I'm with Rick, these are important little devices

Ed Hughes

They certainly ain't cheap as a set, but I replaced mine as part of my project, when I dropped my motor for the clutch at ~75K.

nine9six

George,
Why do we do this? Just to assure a clear oil passage way?
TIA

OverBoosted28

Just assume that if the o ring has disintegrated, it's possible remnants are in the oil passages.

pp000830

Seems they let you know when they begin to fail as they get very loud at start-up once the seal fails. They seem to last 40 60k miles.

Foxman

Yup, just another "while you're in there." I did this as part of an engine refresh for the C4 last winter, and plan on doing the same for the new C2S this winter. Clutch job leads to engine drop leads to....

AOW162435

I helped a friend replace all 12 in his '95 a few months ago. The car had 105,000 miles and the lifters sounded normal. We had a long list of maintenance items, so it just made sense to tackle the lifters as well.



Andreas

Ed Hughes

That's pretty low. I think there are a lot more higher mileage engines that are still fine. I'd wonder if failures could be prone to cars that sit for extended periods, where the lifters sit stagnant.

That's why I laugh when people ask what a clutch replacement should cost. I figure $3500 in parts.

Quadcammer

Comments like this are the cause of silly rumors that get started. There are tons of 993 out there with way more miles than that on original lifters

mpruden

Agree. If this rumor was true, I'd be somewhere between my third and fourth set of lifters. Doesn't seem like this theory passes the sniff test.

geolab

just to clear the passages in the rocker, and axle, as easy as it sounds.
i figure since oil in axle, through rocker, behind lifter is not free flowing after,
any micro nano whatever goes in, stays in.
just pressure blow the passages for a clear check, and people forget to do it