Turbo oil path?

schuy1 · 29th March 2014, 09:04 PM

Ok, wise thing not to damage it. Is it corroded in you think? If you can see it maybe the hot water treatment to see if it moves, eg opens? from the rave description of the oil flow in the housing when the thermo is shut,eg cold state, it seals the turbo feed port, in which case the turbo line gets fed from the oil cooler housing until the thermo opens. Given that description the oil cooler feed needs investigating too

It could be that in cold state when the oil is needed from the cooler that line is blocked. In which case each time at start up minor damage is done to turbo bearings until warm up. The minor damage would of course be cumulative over time, eventually being terminal. The time span would not be long as bearing do not like no oil!
which may explain your scenario?
Cheers Scott

**Alex 110** · 31st March 2014, 07:38 AM

From what you've said, & from reading RAVE, this thermostat seems superfluous, & neither I nor my mechanic can see any problem with removing the internals & giving the turbo full oil flow from cold. Are we missing something?

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schuy1 · 31st March 2014, 09:11 AM

I think you could do that? The main problem I think would be unrestricted flow to the oill cooler matrix and a resulting extended warm up period for the motor. It will have little bearing on the motor running cooler as that is determined by other factors. How the sensors process the altered info is any1s guess

. Before doing that I would check the cooler housing port for the turbo, That may be easy fix as opposed to possibly introducing other gremlins with a thermostat removal? But that is me, Maybe some1 else can read it otherwise?
But it seems certain oil delivery or lack of is the reasons for your turbo malaise!
Cheers Scott

**Alex 110** · 2nd April 2014, 07:44 PM

After checking the oil flow I put it all back together & started it up. No worries at idle but huge clouds of white-ish smoke when the revs climbed.
My mechanic (from the description) tentatively diagnosed a blown head gasket.
2000 model with 208k on the clock & AFAIK the head has never been removed so plastc dowels could be an issue.

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schuy1 · 2nd April 2014, 10:24 PM

damn hey? Did you find anything amiss in the cooler or the filter housing? Co9uld be a head gasket.. Has it ever been hot? That seems to be more the trigger than K's driven.
And remember, the dowels are only designed to locate for assembly, not long term.
Cheers Scott

**Alex 110** · 3rd April 2014, 05:32 AM

Didn't take the cooler off, but nothing obviously amiss with either it or the filter housing (carefully checked passages with cable ties).
Not sure about overheating as I don't always trust the temperature gauge - while driving along I've seen it drop from the normal midrange to nearly cold temporarily before rising again. There seems to be no reason for this & it's not accompanied by any other symptoms or the low coolant alarm going off.

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schuy1 · 3rd April 2014, 07:03 AM

Oki, strange with the temp gauge, could be a earthing/ connection fault or a dodgy sender. Mine sits 1/2 way and never moves up or down once it warms up, yet the nanacom shows it ranging from 82 up to 102 , depending on the day and what Im doing, hills , towing, etc.So the factory gauge is a show pony only

in regards to monitoring. Yet the deefers is up and down like a public seat, hills it goes up, down the other side its back to 1/4 again so good.
So we are now further advanced in the faults regarding the turbo, have you looked at the bearings at all? Did they show signs of oil starvation?
Cheers Scott

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