Welcome to the North American Subaru Impreza Owners Club Thursday June 30, 2022
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 04-25-2022, 01:29 PM   #1
mcpotus
Scooby Newbie
 
Member#: 528561
Join Date: Jan 2022
Chapter/Region: W. Canada
Vehicle:
2011 STi Hatch

Default Found metal flakes in the bottom of the oil pan. Any ideas what they could be from?

I'm in the middle of installing a new shortblock into my STI, but I removed the old oil pan from my original motor and found some very thin flakes of metal at the bottom.

My old engine seemed healthy from a bearing perspective - I'm not replacing it because it failed catastrophically, but I have no idea what this could be from. Any ideas? My main issue is whether this is indicative of some catastrophic failure where I need to treat it as a spun bearing and replace basically anything that touches oil, or if this is not a huge issue. That said I can't imagine any amount of metal at the bottom of an oil pan is great.

- the metal flakes when I first saw them. They're extremely thin pieces, fractions of a mm thin. It's definitely not thick chunks or anything like what you'd expect from a failed ringland or a bearing.



- you can see how thin and small these pieces are.

When I drained the oil initially, there was absolutely no indication of metal in what I drained. I was very specific about checking the drained oil to see if I could see any hint of anything sparkling and I didn't see anything remotely like that.

Some additional info: without any knowledge of these metal flakes being in my system, there was no indication of anything majorly wrong with my car. I was able to drive it without much issue - no smoke of any kind indicating ringlands. The reason I'm replacing the shortblock was because the heads had to get rebuilt due to a burnt valve (you can see my previous thread) and I figured I'd replace the shortblock too at the same time.

Anyway, any ideas on what this could be and suggested next steps would be much appreciated.
* Registered users of the site do not see these ads.

Last edited by mcpotus; 04-25-2022 at 04:15 PM.
mcpotus is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 04-25-2022, 02:47 PM   #2
Waddlz
Scooby Specialist
 
Member#: 395275
Join Date: Jul 2014
Chapter/Region: RMIC
Location: Fort Lupton, CO
Vehicle:
2012 STi
SWP

Default

Those almost look like the aluminum foil or whatever that goes over 5qt oil jugs. Possibly one fell into the oil when you/dealership/PO whatever added oil.
Waddlz is offline   Reply With Quote
Old 04-25-2022, 03:19 PM   #3
mcpotus
Scooby Newbie
 
Member#: 528561
Join Date: Jan 2022
Chapter/Region: W. Canada
Vehicle:
2011 STi Hatch

Default

Quote:
Originally Posted by Waddlz View Post
Those almost look like the aluminum foil or whatever that goes over 5qt oil jugs. Possibly one fell into the oil when you/dealership/PO whatever added oil.
You got me thinking so I checked the pieces I found again, and I don't think the foil from the oil jug is it. The pieces I found are very hard and I wasn't able to bend it by just putting pressure with my fingernail - the oil jug foil is basically aluminum foil and you can rip it with little effort unlike these which I can't even deform.
mcpotus is offline   Reply With Quote
Old 04-25-2022, 03:42 PM   #4
Waddlz
Scooby Specialist
 
Member#: 395275
Join Date: Jul 2014
Chapter/Region: RMIC
Location: Fort Lupton, CO
Vehicle:
2012 STi
SWP

Default

Quote:
Originally Posted by mcpotus View Post
You got me thinking so I checked the pieces I found again, and I don't think the foil from the oil jug is it. The pieces I found are very hard and I wasn't able to bend it by just putting pressure with my fingernail - the oil jug foil is basically aluminum foil and you can rip it with little effort unlike these which I can't even deform.
ah ok then.

Are they magnetic at all?
Waddlz is offline   Reply With Quote
Old 04-25-2022, 03:44 PM   #5
mcpotus
Scooby Newbie
 
Member#: 528561
Join Date: Jan 2022
Chapter/Region: W. Canada
Vehicle:
2011 STi Hatch

Default

Quote:
Originally Posted by Waddlz View Post
ah ok then.

Are they magnetic at all?
Nope, they are not. Looks like aluminum to me.
mcpotus is offline   Reply With Quote
Old 04-25-2022, 04:08 PM   #6
rtv900
Scooby Guru
 
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:
2016 STI

Default

links aren't working at all on my end
rtv900 is offline   Reply With Quote
Old 04-25-2022, 04:11 PM   #7
BlackFighter
Scooby Specialist
 
Member#: 193940
Join Date: Nov 2008
Location: Philly
Vehicle:
2004 WRX STI Black
RalliSpec Shortblock

Default

Quote:
links aren't working at all on my end
copy and paste in to browser.
BlackFighter is offline   Reply With Quote
Old 04-25-2022, 04:13 PM   #8
mcpotus
Scooby Newbie
 
Member#: 528561
Join Date: Jan 2022
Chapter/Region: W. Canada
Vehicle:
2011 STi Hatch

Default

Yeah Nasioc likes to mangle imgur links - the recommended Nasioc specific image host doesn't work either. I suppose I could put them elsewhere.

EDIT: Updated with different image host
mcpotus is offline   Reply With Quote
Old 04-25-2022, 04:27 PM   #9
benflynn
Scooby Specialist
 
Member#: 515308
Join Date: Jun 2020
Default

Take it apart and find where they came from
benflynn is offline   Reply With Quote
Old 05-12-2022, 07:45 PM   #10
12wrx1
Scooby Newbie
 
Member#: 386873
Join Date: Apr 2014
Chapter/Region: NWIC
Location: WA
Default

Could they be chunks of hardened RTV sealant that fell from the inside of the the oil pan?
12wrx1 is offline   Reply With Quote
Old 05-12-2022, 08:11 PM   #11
mcpotus
Scooby Newbie
 
Member#: 528561
Join Date: Jan 2022
Chapter/Region: W. Canada
Vehicle:
2011 STi Hatch

Default

nah they were metallic and shiny. definitely nothing like hardened RTV
mcpotus is offline   Reply With Quote
Old 05-13-2022, 01:18 AM   #12
12wrx1
Scooby Newbie
 
Member#: 386873
Join Date: Apr 2014
Chapter/Region: NWIC
Location: WA
Default

I take what I said earlier back, they would have to be off of a piston or bearing then, ringland pieces?

Last edited by 12wrx1; 05-13-2022 at 01:38 AM.
12wrx1 is offline   Reply With Quote
Old 05-21-2022, 06:04 PM   #13
2.5LBoxer2
Scooby Newbie
 
Member#: 529466
Join Date: Mar 2022
Default

might be from the turbo, check play from bearing
2.5LBoxer2 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 12:44 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2022 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.