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 Post subject: oil reservoir on The turbo
PostPosted: Mon Feb 19, 2018 9:52 pm 
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Vehicle: 2010 Forester Diesel

Posts: 18
Location: Gold Coast
Hi all

Have any of you noticed the small oil reservoir on The bottom of the turbo?
Underneath the steel plate on the bottom.
Comes with drain plug and everything

The question is

A) is it connected to the main sump?
B) when drained will it fill via the main sump?
C) if separate, how much oil does it Take?

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Roland

2010 Frosty
2" lift, Snorkel, no EGR or DPF, 235/60/17, bashplate, sidesteps, rear wheel carrier, Aldi roofrack, tray and awning


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 Post subject: Re: oil reservoir on The turbo
PostPosted: Mon Feb 19, 2018 10:56 pm 
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I Say: Car mods are like OddBodz, you got to collect them all! -------------------------------------
Vehicle: MY05 STi swapped sled

Posts: 17786
Location: Spearwood Perth WA
It is a sump to collect engine oil from the turbo lubtication. Because the turbo is low mounted, it cannot simply gravity drain back into the main sump like a regular turbo. What Subaru done is build a sump like container below the turbo, this allows oil to drain from the CHRA. They then use an oil pump to scavemge that container amd transfer the oil back into the main sump to be re-circulated as per usual.

I havent specifically examined the diesel engines, but i believe the pump may be driven mechanically from one of the cam shaft sprockets. This is how they do it with the late model petrol turbo engines.

I have done my own low mount turbo on my 04 forester. I have a similar sump below mh turbo, but use an electric scavenge pump to circulate the oil. But i am moving to a 5 stage drysump on my next motor which will allow me to utilise a dedicated scavemge stage for the turbo if i wanted to do away with the elctric pump.

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 Post subject: Re: oil reservoir on The turbo
PostPosted: Wed Feb 21, 2018 8:48 pm 
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Vehicle: 2010 Forester Diesel

Posts: 18
Location: Gold Coast
Thanks Bram!

So maybe at the next oil change I drain that one as well.
Came across it by accident when I had to fix my blown off turbo pipe the other day

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Roland

2010 Frosty
2" lift, Snorkel, no EGR or DPF, 235/60/17, bashplate, sidesteps, rear wheel carrier, Aldi roofrack, tray and awning


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