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Old 12-23-2014, 05:35 AM   #1
cleanthez
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Default Remove those Banjo bolt filters!

Warning: Story and pictures.

I just wanted to share with you guys a lesson I learned the hard way today. To start this off, I have a bone stock 08 WRX(Aside from a downpipe and AP2). The car started to develop a misfire on the number four cylinder that was later diagnosed as a burnt valve.

The silly exhaust valve culprit:
http://imgur.com/mJkbB5d.jpg

Full valvetrain rebuild later, and we have a fresh running engine. She felt good and strong and no leaks were present. Fresh synthetic oil and filter and I thought I was off scott free. Boy was I wrong.

A week of back and forth to work driving and the check engine light came on. This time for the bank 1 cam positioning advanced. I cleared the code and went on. The code came back after another day with the second bank tagging along. She was also running rough and would stall. I got to investigating the code, and discovered it had to do with the variable valve timing and the oil control. Removed both oil control valves and gave them a good clean. They were not dirty, but your mind wants to believe that some little piece of invisible sediment was causing all this hubbub.

After getting them back in, I decided to check the oil. Not enough oil pressure would cause those control valves not to move right? Checking the dipstick is a simple task that is often overlooked, especially when it's not showing a single drop on the ground.

What was this? The oil wasn't even showing on the stick? This cannot be....

So, I topped it off as my mind went racing. No oil on the ground means it's either out the tailpipe or into the coolant. The coolant was good and green, so of course it had to be burning it. Once topped up and started, the rough running went away, only to be replaced by a gradual bit of white smoke out the tailpipe. I shined my flashlight into the smoke and it also had a blue hue to it. Turbo is fried! I know it....

So, I am going nuts...is it oil...is it coolant.... I drain the oil and its gone milky...

Oh crap! Blown head gasket? I just put this thing back together with new head gaskets. The turbo can't be mixing these two can it? I've seen blown turbos before and its always been straight oil. So i'm dreading it all as I am pulling this turbo off. I get the downpipe off and its all caked in oil and coolant on the inside. I pull of the turbo and set it on the ground....

Yup, it was that bad.

Cold side:
http://imgur.com/cTFPPSJ.jpg

Where is the nut? I found it inside the intake pipe just chillin.

Hot side:
http://imgur.com/o0nLVwz.jpg

This thing is toast....completely wasted.
So I get to thinking about reasons. I did some research on failure with these things and that banjo filter kept coming up. After taking off the banjo I could get to(The one leading directly to the turbo)...it was completely clogged. I held it to the light and not a bit of light shone through. Had to be it....

Moral of the story...remove these filters....especially after a rebuild. Hindsight is a bitch right now as I TOOK THESE BOLTS OUT when working on them and didn't notice the filter stuff(was not aware this was an issue on these scoobies).

The silver lining is that I now have a vf52 on it's way with a tune from eric as well so she will wake up with a bit more power.
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Old 12-23-2014, 07:22 AM   #2
turborex696
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Default

Yea those pesky banjo bolt filters are terrible on these cars. An engineer needs to be smacked somewhere. I pulled my turbo yesterday for up pipe reason and found it pretty clogged as well. Glad I caught it before my blouch turbo was fried. I would still be crying if that happened.
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Old 12-23-2014, 06:58 PM   #3
marcua66
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Iv seen this happen to 2 different legacy gts now. I have nightmares about mine now.
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Old 12-23-2014, 08:36 PM   #4
Dragonfueled
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There's only 2 rite?
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Old 12-23-2014, 11:34 PM   #5
2Fast4U1DAY
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3 IIRC. One for each head/avcs and one for the turbo.

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Old 12-24-2014, 02:09 AM   #6
klaas
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Quote:
Originally Posted by Dragonfueled View Post
There's only 2 rite?
I found a good page on the issue here, http://store.forcedperformance.net/m...Info_SubaruOil
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Old 12-24-2014, 06:19 AM   #7
cleanthez
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I just wanted to give everyone a heads up as I did not know about these even with all the information on them. The proof is in the pudding...and this pudding is a mix of oil and coolant.
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Old 12-24-2014, 10:50 AM   #8
Razgeiz
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My buddy lost his 20g on his 04 STi thanks to those stupid screens. His turbo looked exactly the same with the nut hanging out in the inlet

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Old 12-24-2014, 11:40 AM   #9
DGA
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8-years, 50k miles, and the turbo banjo bolt filter, in my '08 LGT, is completely clean. I'm also religious about oil changes. The thought is that they clog mainly due to lack of timely maintenance.

Track or auto cross your car? You should be changing your oil/filter a lot more than what the factory specifies. I change my motorcycles' oil after two track days, even when they are less than a week apart.

If you are still paranoid, remove the filter and get an external filter from Mike over at Infamous. http://www.infamousperformance.net/s...rbo-Oil/Detail

Running a BNR turbo will require you to get one to keep your warranty on the turbo.
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Old 12-24-2014, 09:21 PM   #10
montanasuby
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I removed those screens when I did my rebuild.
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Old 12-31-2014, 02:19 AM   #11
ScoobyBro
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Are these banjo bolt filters an issue on 2011+ WRX's as well? I just bought one with 50k miles and am wondering whether it would be good to check this...
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Old 01-02-2015, 08:31 PM   #12
RexKwonDo
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Read through this thread and the info that FP put out...I know they recommend removing the filter(s) when using their aftermarket turbos, but would removing them on a stock turbo be overkill, or allow too much oil to pass? I intend on checking them at the least, but debating on completely removing them. Thoughts?
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Old 01-13-2015, 05:19 PM   #13
64rarebird
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My 2005 Forester xt turbo just packed it in suspect this stupid filter but havent had a chance to look yet
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Old 01-13-2015, 06:40 PM   #14
Max Capacity
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Remove both the filters. We have been telling people to do that on the LegacyGT forum for years on 05-06's

It does seem the 07-09 LGT's don't have the same issue.

When my vf40 went at 142,000 miles, tthe filter was removed about a 1000 miles before because of the P0011 ans P0021 CEL. The turbo began to whine under boost, I kept my ear on it, one morning it whistled, I took the car the 1/2 mile back to the house and shut it off, ordered a vf52.

The blades had just begun to kiss the housing. The engine was fine. I got lucky.
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Old 01-14-2015, 04:01 PM   #15
misfitsfreak81
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Quote:
Originally Posted by DGA View Post
8-years, 50k miles, and the turbo banjo bolt filter, in my '08 LGT, is completely clean. I'm also religious about oil changes. The thought is that they clog mainly due to lack of timely maintenance.

Track or auto cross your car? You should be changing your oil/filter a lot more than what the factory specifies. I change my motorcycles' oil after two track days, even when they are less than a week apart.

If you are still paranoid, remove the filter and get an external filter from Mike over at Infamous. http://www.infamousperformance.net/s...rbo-Oil/Detail

Running a BNR turbo will require you to get one to keep your warranty on the turbo.

The #1 reason these clog is due to poor maintenance by current or previous owners. Obviously there are also just freak occurrences, but it's normally from lack of timely oil and filter changes.


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Old 01-14-2015, 09:03 PM   #16
pearl08
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Do you guys replace the three or just the one at the turbo?
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Old 01-14-2015, 10:49 PM   #17
kaczmarz
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325/347, 380XT, 8 cm2

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Wouldn't banjo bolt screen clogging be a reason for high pressure bypass valve in oil filters?
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Old 01-22-2015, 12:06 PM   #18
Subiedown
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I got the dreaded p0011 code on monday this week. Drove it about 3 miles with the cel on in order to have it checked at autozone. While I was driving it, the only thing I noticed different about the car was a tiny bit of turbo squeel for a fraction of a second on deceleration. Wasnt down on power or anything. Did some research and decided to change the oil and see if it reset the cel. It didnt so I removed the banjo filter from bank 1. I have an 08 wrx, so I had to remove the inlet to get to it. The screen wasnt caked, but it was clogged with a thin film of fine carbon. I removed the filter and installed the bolt without it. Then I decided to see what kind of play I have on the cold side of the turbo. There is more than I am comfortable with but Im not sure how much is too much. There is a thin film of oil in the turbo and in the tmic. Not sure if any of this is normal. The car has 68k. REMOVE THOSE BANJO FILTERS now so you dont have to deal with this!!!!
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Old 01-22-2015, 12:09 PM   #19
Subiedown
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Quote:
Originally Posted by pearl08 View Post
Do you guys replace the three or just the one at the turbo?
Is there one on the turbo on the 08's? I took out the one 5" in front of the turbo. I know of the one behind the timing cover on the drivers side, but I dont have the p0021 code and its a pita to get to. Is there another one?
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Old 01-22-2015, 12:41 PM   #20
tazswing
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I took mine out ages ago. But I do think that very good attention to the oil on these cars is crucial. Ever really looked at how little oil these cars carry vs. other manufacturers? And then start running the car hard.


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Old 01-22-2015, 01:07 PM   #21
Subiedown
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The silver lining is that I now have a vf52 on it's way with a tune from eric as well so she will wake up with a bit more power.[/quote]


Does he have 2?☺️⬆️

I'm am afraid if I put it back together with this turbo it will fail and ruin my engine. Does anybody know how much play the TD04 should have?


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Old 01-22-2015, 03:18 PM   #22
05flat4
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is there a how to remove these thread out there?
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Old 01-22-2015, 08:49 PM   #23
teds-rex
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Peaty has a great thread i referred to for the AVCS ones (just removed an hour ago).
http://www.scoobymods.com/showthread...ough-5782.html

As he points out, the AVCS ones like to drop into the body... both sides were like this on mine.

Quote:
Originally Posted by 05flat4 View Post
is there a how to remove these thread out there?
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Old 01-22-2015, 08:54 PM   #24
teds-rex
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Quote:
Originally Posted by RexKwonDo View Post
Read through this thread and the info that FP put out...I know they recommend removing the filter(s) when using their aftermarket turbos, but would removing them on a stock turbo be overkill, or allow too much oil to pass? I intend on checking them at the least, but debating on completely removing them. Thoughts?
So I thought that just the AVCS filters should be removed... and this was my plan. Stopped at Subaru dealer on the way home for 6 of the washers (2ea for the 2x AVCS and the turbo) and also planned to buy a new banjo with filter for the turbo (just in case mine was really junked up). Well out they come with a banjo with NO filter. I talked to him for a few minutes and he double checked... thats the part they are selling (at least at my local dealer) with NO filter for the turbo either. He also asked the parts manager and he noted that for replacements they have stopped using the filters for the same reason. Saw the TSB for the AVCS ones, but nothing "official" about removing the filter on the turbo one...

Needless to say i removed all 3 filters, just in case.
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Old 01-22-2015, 08:58 PM   #25
teds-rex
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One additional note... PLEASE... PLEASE if you have your downpipe/uppipe out do the turbo one at the same time. It looks SO painful to do, but when the up/dp are out, it was VERY EASY!
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