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Join Date: May 2007
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Pic 1 is the bypass indeed.

Old 02-09-2012, 11:08 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #21 (permalink)
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ok - thanx again

Now you see my own knowledge reveiled as well......
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79 930 blue/blue & 74 914 silver w/chrome & black
X 97 993 C2S - red/cashmere
X 78 911 Speedster - silver/black
-and prev. 20 other porsches
Old 02-09-2012, 11:28 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #22 (permalink)
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Here are some Pelican links that will help you learn about those components:

Changing 930 dump-gaskets, pictures galore

How to bypass decel valve?
Old 02-09-2012, 12:29 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #23 (permalink)
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Thanx - I'm all over it - the turbo world is new to me - but I have had several CiS 911's so it is about time to dig into it

Next project will be a 72 targa - which I haven't found yet..... and 3,2 SS with trombone/efi
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eivind hornnes
79 930 blue/blue & 74 914 silver w/chrome & black
X 97 993 C2S - red/cashmere
X 78 911 Speedster - silver/black
-and prev. 20 other porsches
Old 02-10-2012, 04:43 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #24 (permalink)
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For future searchers, page 21-4 of shop manual says max end play of turbine is .35mm total, and radial play is measured by pressing turbine wheel towards side of housing and measuring gap on the opposite side with feelers, then repeat measurement on the other opposite side.. Difference of both measurements is the radial play. Max play is .65mm

As this is the stock manual for 1986 930, it would be for the k26. Whether other kkk variants are the same is something you would need to determine with a later manual or different source.
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Old 02-11-2012, 07:02 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #25 (permalink)
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Quote:
Originally Posted by mark houghton View Post
Just to add to Jim's comments, some small amount of lateral play is normal given the already lose tolerances in the journal bearings. Be sure that - when checking for play - you're "wiggling" the compressor end of the turbo shaft and not the exhaust end.

Someplace, I've got filed information on the runnout specs, etc. For those without a good dial gauge to measure the deflection, there is a quick method of sliding a .010 feeler gauge between the compressor blades and the housing while deflecting the shaft to it's maximum amount.

Ah! Found it:::

On new turbos the end play seems to be well under .005 and often hard to detect with your hands. If its exceeding .005 the ring seals will take a beating and are more likely to pass oil.
Lateral play, roughly .010 to .015 measured radially at the nut or at the extension of the turbine.
When the radial play is around .025 but more importantly if the feeler gauge measurement between the wheels and the housings gets down to .005 its time to have the unit overhauled prior to having the wheels rub which will ruin the balance and potentially damage the wheels.
Cool, was just looking for this info . What was the world like before the internet?

As a side question, anyone know how much oil pressure is lost through the turbo as it wears out?

Tons of threads about folks with low oil pressure, but Ive never seen anyone mention the turbo as a possible source of pressure loss...why is that?

Old 12-29-2019, 04:34 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #26 (permalink)
 
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