Welcome to the North American Subaru Impreza Owners Club Thursday June 4, 2020
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
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. 
Thread Tools Display Modes
Old 05-22-2020, 09:37 PM   #26
Scooby Newbie
Member#: 514784
Join Date: May 2020
Location: So cal high desert

I just pulled the thermostat. I tested it in boiling water alongside the new OEM one. It seems to be functioning just fine can I see no evidence of a leak or anyting.

So I just had a friend deliver an engine lift to my house. I've been researching Subaru engines for quite a while now. as mad as I am that I have to tear apart this car that I just bought I am slightly excited about it.

I'm fairly sure did I know all the parts that I need to order but if anybody feels like making a list and throwing it up here I'd appreciate that. Most of my research has been for a non-turbo sohc Subaru.
This is what I plan to order:
Subaru OEM updated head gaskets
2 exhaust manifold gaskets
Intake manifold gaskets
Valve cover gaskets with spark plug seals (not necessary but since the engines out I'm going to do it anyways)
OEM head bolts
OEM coolant temperature sensor
Turbo outlet gasket
maybe a timing kit mine is brand new so I might just use it again.

That is a list that I come up with off the top of my head. is there anything else you guys can think of or any resources you recommend to read up on this job? I did just order a digital copy of the service manual.

Also if there's any specific tools that will make my life easier please recommend them. I'm an amputee and I only have one hand so the easier the better! I will probably end up making another thread just to get more info on all these questions and any questions that come up as I go, but I figured I'd start here.

Once again thank you all for your input and all the help. I'd be lost without all the internet people!
* Registered users of the site do not see these ads.
Moosemanty is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 05-22-2020, 10:13 PM   #27
Scooby Guru
Member#: 70710
Join Date: Sep 2004
Chapter/Region: Tri-State
Location: Quakertown/AREA1320 391whp
2002 04STi Swaped RS
w/PPGS & 02 Wagon w/PPGs


With 117k the HG were up for a change anyway. Be sure to take good pics of both sides of the HGs Block & heads when you take them out. That’s really the only visual we will get for a bad HG and even then it can be hard to see if it’s slight.

Hope you have an engine stand too

You will need exhaust gaskets for both sides of the turbo and the up pipe to manifold. Grimspeed sells a kit with all of them including manifold gaskets. Timing components should be reusable with only 20k on them. I’d be surprised if you don’t need to replace the valve cover gaskets as they expand after getting oil on them and don’t like going back into place. You might want to flush the coolant system before pulling the engine with a coolant flush like Preston/Cleaner. It’s amazing what junk gets in there and then it’s done and you won’t have to drop the coolant a 2nd time.

Last edited by dangerousatom; 05-22-2020 at 10:21 PM.
dangerousatom is offline   Reply With Quote
Old 05-27-2020, 09:43 PM   #28
Scooby Specialist
Member#: 279525
Join Date: Apr 2011
Chapter/Region: Tri-State
Location: QUEENS NY
06 Fxt


Aren't there levels to this? As in just because you have a hg issue doesn't necessarily mean you will 100% be blowing out white smoke from your exhaust.

I think what matters is the degree of damage to said head gasket.

I have had two (2) Subarus with head gasket woes. 2 different symptoms on each.

04 wrx: coolant overflow bottle would get full after every drive. Cooling system was being over pressurized and pushing coolant unto overflow bottle (plastic bottle near radiator)

04 leagcy (N/A): this one had an external coolant leak. I could run my finger near rear driver side of short block (where block and heads meet) and feel coolant leaking from there.

danger1138 is offline   Reply With Quote
Old Yesterday, 01:05 PM   #29
Scooby Newbie
Member#: 464859
Join Date: Mar 2017

My previous 2007 XT did similar. On the highway if I pushed it hard the temp gauge would creep up and if I let off it would go back down. It stopped doing that with a new radiator.
scubaboo is offline   Reply With Quote
Old Today, 11:55 AM   #30
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
Chapter/Region: SCIC
Location: Orange County CA
2004 WRX wagon


Originally Posted by Moosemanty View Post
Thanks for the write up!

If it were a head gasket wouldn't I see it smoking? I mean if it drains the overflow in a 5-minute drive that's a lot of coolant. I would think that would make some pretty obvious smoke out of the exhaust, wouldn't it?
subarus dont really work that way. What happens to them is they leak exhuast air into the cooling system. get a block tester and make sure that its not the head gasket
subaru_gc8 is offline   Reply With Quote

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 09:55 PM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2020 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.