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2008 Forester Cross Sport AUTO
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Discussion Starter #1
I have had the valve seals redone recently & it is running better.

However, over the last couple of weeks I have been using quite a bit of oil.

This is a new one.

Also, when I use the fun pedal and you look in the mirror you'd think i was driving a Diesil with the black stuff that comes out of it's bottom.

I had it booked in today for a compression test.


On the Passenger side it was mid 8's & on the Drivers side (nearest the blower) 9's. So that's good news.

They looked under the blower & noticed it was wet, & a bit of oil coming out of the bottom of the turbo.

They are going to whip the blower out next week & have a good look at it.

I understand what they say in that, until they take it apart, they don't know what it could be.

A possibility they say, could be a leaking oil seal, hence the slight loss of boost & the use of oil.

Any theories?

Thanks.

regards




Alan MaC
 
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A blown turbo would use oil and give you lots of smoke, you will also have oil in the intercooler, quite a bit of it too, maybe worth checking yourself.
What turbo have you got Alan?
 

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99 UK S-turbo
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Black smoke is overfueling, blue is oil....

If the underside of the turbo is wet with oil its probably the drain tube isn't on right or has split.

Assume the compression pressures are bar, not sure what Subaru's (Forester should be higher than Impreza due to the softer cam timing) usually are but that looks poor, my old XR4x4 (9.2:1 CR) was healthy at 185psi - 12 and a bit bar.

Simon
 

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2008 Forester Cross Sport AUTO
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Discussion Starter #6
Cheers for the replies.

I hope it's just a split tube.

Regards



Alan MaC
 

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2008 Forester Cross Sport AUTO
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Discussion Starter #8
Cheers Don,


I knew you would have something on this. :biggrin:

As I said it was high 8's on the Passenger side (both)

& 9's on the Drivers side (Both)

The Garage thought that was fine.

What do you think?

I have booked it in next Friday for them to take the Blower to bits & inspect.

Cheers

Regards


AM
 

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99 UK S-turbo
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Well Dons data suggests you compressions are a little low, but I would alsways try a different tester before doing anything else!

Its also worth getting them done 'wet' (small amount of oil into chamber) as that will give you an idea of leakage past the rings.

Simon
 

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2008 Forester Cross Sport AUTO
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4,439 Posts
Discussion Starter #11
It was the Seals & Clips that had perished, done today at the Garage.

Boost is better & no more black smoke, I had a couple of other things looked at today.

Thanks everyone for your replies.

regards


Alan MaC
 

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1997 S/TB
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Sorry to be a pedant, but the first sentence in this thread is you saying "I have had the valve seals redone recently & it is running better." and then it turns out that they were the problem? I'm a bit confused, but glad it's sorted!
 

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2008 Forester Cross Sport AUTO
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4,439 Posts
Discussion Starter #15
The Valve Seals were the Piston Valves.

The Black Smoke was down to the Seals in the Turbo leaking, 2 new Brass Washers, Banjo Joint Clip & new Pipe fitted.

Sorry I probably could have made it a bit clearer.

Regards


AM
 

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MY14 Audi SQ5 8AT
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That's not a particularly good advertisement for the VF41, three years old, and needs new seals.. it's not like you are wringing the nuts out of it either..
 

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2008 Forester Cross Sport AUTO
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Discussion Starter #17
I know, however, it's running sweet as a nut again.:biggrin:


Regards


AM
 

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Seals all sound external not internal? maybe due to some poor work during the swap from original fitment at Alan's car?

Simon
 
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