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996 TT - Turbo Scavenge Pump - Turbo smoke / external leak


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Hi everyone,

Recently been dealing with a 996 TT with excessive smoke...

After some turbo rebuilding the smoke from the tailpipe stopped but they started leaking externally. After some research turbos are not necessarily oil tight..meaning that the oil is not getting evacuated from the turbo reservoirs.

More time and research led me to checking the turbo scavenge pump
(yes they have 3, 1 on each head and one in the center for the turbos)

Attached are the photos of some carnage, basically the drive off the intermediate shaft is stripped.

I'm hoping one of the gurus will chime in on the extent of the required repairs now...

Is the drive piece replaceable or am i splitting the case?

Cheers,

D.

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  • 4 weeks later...

does anyone have a schematic / parts blow up from workshop manual for the 996 TT for the intermediate

or an actual photo of the turbo intermediate shaft end where the drive plug / screw for the scavenge pump goes?

need to verify something.

much obliged.

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  • Admin

does anyone have a schematic / parts blow up from workshop manual for the 996 TT for the intermediate

or an actual photo of the turbo intermediate shaft end where the drive plug / screw for the scavenge pump goes?

need to verify something.

much obliged.

Like this?

(click to enlarge)

post-1-0-97516900-1383253709_thumb.png

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  • Moderators

does anyone have a schematic / parts blow up from workshop manual for the 996 TT for the intermediate

or an actual photo of the turbo intermediate shaft end where the drive plug / screw for the scavenge pump goes?

need to verify something.

much obliged.

Like this?

(click to enlarge)

attachicon.gifintermediate shaft.png

Gee, that looks familiar............. :P

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hi guys, yes have been vague... my apologies

the engine in question has been well... butchered. someone has drilled the end of the intermediate shaft and heli coiled it. :censored:

i think at this point we all know what the proper way to repair this is now... new shaft. I cannot get approval for this and must do the same repair.... just better. i have my methods and after im complete i will post in detail wether its a success or not. then you can all flame me afterwards :D

right now the hole in the shaft is large enough to drop the drive plug right in. (#14 in diagram) so I trial fit the scavenge pump but it does not sit flush.

basically the thickness of the shoulder of the drive plug is in my way..... my question is.... is it possible that a non turbo shaft is installed? should there be a recess / countersink for the drive plug?

the engine has all sorts of markings from lets say possibly a machine shop or something, so its possible that someone might have had it right apart before.....

in case you are wondering, the last repair someone cut the drive plug in half and threaded it into the helicoiled shaft and also cut the scavenge pump drive by about half. not enough mechanical advantage and the drive plug got stripped thus not driving the scavenge pump any more...

(i have lots of photos this will be very interesting for all the gurus im sure when im done, ill include my PSA and soapbox rant)

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From the sounds of the way the shaft looks, I would not hesitate to replace it as it sounds like someone has done some "creative" repairs at some point in time, and may have modified or swapped parts from another engine.

That said, you may have to shorten the shaft you have to give you clearance for the end plug, and either re-Helicoil the end, or weld it up and re-machine it to the correct size; but I would have to wager that would end up costing more than sourcing a replacement.

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  • 2 months later...

Long Story Short - vehicle is back on the road for some time now and everyone is happy. yay!

No smoke and lots of power, After turbo's being overhauled and intermediate shaft was repaired a chip tune with upgraded diverter valves was done..

Basically the repair was done in the car with the engine assembled, I would have love to see a tear down with a proper part replacement but the situation did not allow...

Hopefully the pics will tell the repair tale.

Drilled out shaft, time sert, machine drive plug, replaced coolant housing / scavange pump

Cheers.

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