Welcome to the North American Subaru Impreza Owners Club Sunday July 21, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Built Motor Discussion

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 10-21-2023, 11:07 AM   #1
Mauled
Scooby Newbie
 
Member#: 500169
Join Date: Apr 2019
Default Oil leak between block and head

I'm trying to identify what could of caused this to happen, my car started leaking oil out between the block and the head. It's the driver side head and it was leaking oil out of the top front corner of the head, near where the oil is sent into the head through the block. As soon as I started the car up it would leak and run all the way down the front of the engine behind the timing cover and pool oil on the bottom.

I replaced the head gaskets last year, not because it overheated (it didnt), but just because I put arp head studs on. The heads were decked before I put them back on. The only thing I didn't do when cleaning the gasket surface on the block was take the dowel pins out, I wonder if this would be a good idea. The leak is right near where one of the dowel pins is.

Ill post up pictures later today of what the head gasket looked like upon removal. I'm just wondering if anyone else has seen this and how common it is for a head gasket to leak oil only. I'm in the process of putting it back together now and just wondering if there's anything I can do differently that will help. I don't have any shops near me to do this so I'm forced to fix it myself. Thanks.
* Registered users of the site do not see these ads.
Mauled is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 10-24-2023, 09:04 AM   #2
danger1138
Scooby Specialist
 
Member#: 279525
Join Date: Apr 2011
Chapter/Region: Tri-State
Location: QUEENS NY
Vehicle:
06 Fxt

Default

What vehicle (model and tear) is in question? Possibly AVCS banjo bolts loose??
danger1138 is offline   Reply With Quote
Old 10-24-2023, 11:44 PM   #3
spoolinsti05
Scooby Guru
 
Member#: 108051
Join Date: Feb 2006
Chapter/Region: AKIC
Location: Oneonta, NY
Vehicle:
2005 WRX STi
WRB

Default

You sure it isn't a cam seal? You sealing the avcs cam covers properly? You installing the cam seals with the caps? Or after installing the caps?

Check receiving holes for derby and check cam caps for any burrs. Clean everything thoroughly. With lint free clothes.

Sent from my moto g 5G (2022) using Tapatalk
spoolinsti05 is offline   Reply With Quote
Old 11-17-2023, 12:11 PM   #4
Mauled
Scooby Newbie
 
Member#: 500169
Join Date: Apr 2019
Default

No it was definetly coming out between the block and the head. Not the cam caps or the valve covers. Right where the oil port is on the block/head. I put uv dye in the oil to test it and confirmed it. When I pulled the heads off it looks like the machine shop resurfaced the heads with sandpaper, the finish was way to rough. This time around I told him I want a 50ra finish.

I have a couple questions, how much material can I take off the heads before having to run a thicker head gasket? Last time it was resurfaced I just ran the stock thickness and it was fine. I'm wondering if I can do the same, and if I will run into any problems with timing?
Mauled is offline   Reply With Quote
Old 11-17-2023, 09:17 PM   #5
Elbert Bass
Scooby Specialist
 
Member#: 283429
Join Date: May 2011
Chapter/Region: South East
Location: Down yonder.
Vehicle:
2016 Fuji Sunfire 03
Silver

Default

Quote:
Originally Posted by Mauled View Post
No it was definetly coming out between the block and the head. Not the cam caps or the valve covers. Right where the oil port is on the block/head. I put uv dye in the oil to test it and confirmed it. When I pulled the heads off it looks like the machine shop resurfaced the heads with sandpaper, the finish was way to rough. This time around I told him I want a 50ra finish.

I have a couple questions, how much material can I take off the heads before having to run a thicker head gasket? Last time it was resurfaced I just ran the stock thickness and it was fine. I'm wondering if I can do the same, and if I will run into any problems with timing?
There is a head height specification in FSM - if you would care to share what model/year/engine you are working on someone may look up the correct information for your application and share.
Elbert Bass is offline   Reply With Quote
Old 11-18-2023, 05:50 PM   #6
Mauled
Scooby Newbie
 
Member#: 500169
Join Date: Apr 2019
Default

It's an ej207 version 8 motor. With about .005 removed off the heads. I used the stock head gasket last time after the resurface and was fine, so now an extra .003. Should be fine right?

Hoping I don't have an issue with timing as well.
Mauled is offline   Reply With Quote
Old 11-18-2023, 10:46 PM   #7
spoolinsti05
Scooby Guru
 
Member#: 108051
Join Date: Feb 2006
Chapter/Region: AKIC
Location: Oneonta, NY
Vehicle:
2005 WRX STi
WRB

Default

.008 is the maximum of I recall. So you'll need thicker gaskets. Or timing won't be right.

Sent from my moto g 5G (2022) using Tapatalk
spoolinsti05 is offline   Reply With Quote
Old 11-20-2023, 01:13 PM   #8
rtv900
Scooby Guru
 
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:
2016 STI

Default

Quote:
Originally Posted by Mauled View Post
It's an ej207 version 8 motor. With about .005 removed off the heads. I used the stock head gasket last time after the resurface and was fine, so now an extra .003. Should be fine right?

Hoping I don't have an issue with timing as well.
how's a gasket issue going to affect timing?
rtv900 is offline   Reply With Quote
Old 11-20-2023, 03:35 PM   #9
Jedi03
Scooby Specialist
 
Member#: 491095
Join Date: Sep 2018
Chapter/Region: SWIC
Location: New Mexico
Vehicle:
2009 STi Blue
Blue

Default

when the distance is reduced the number of teeth between the pulleys is less, https://www.flatironstuning.com/blog...nent-up-grades
Jedi03 is offline   Reply With Quote
Old 11-20-2023, 10:56 PM   #10
tunermt
Scooby Newbie
 
Member#: 158767
Join Date: Sep 2007
Location: az, mt, seoul, bangkok
Default

Quote:
Originally Posted by Mauled View Post
It's an ej207 version 8 motor. With about .005 removed off the heads. I used the stock head gasket last time after the resurface and was fine, so now an extra .003. Should be fine right?

Hoping I don't have an issue with timing as well.
will be close, try to machine them flat and check how much you had to take off. If it's well past spec likely better off getting a fresh set of heads to use in the new build.
OEM subi mls head gaskets are great, some aftermarket thicker gaskets can be less then ideal but may sneak you by in this case.

Good luck hope you have her back together and boosting soon
tunermt is offline   Reply With Quote
Old 11-27-2023, 01:25 PM   #11
Mauled
Scooby Newbie
 
Member#: 500169
Join Date: Apr 2019
Default

I bolted the heads on with the stock head gaskets. Total taken off the heads are somewhere around .005.
Mauled 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 06:23 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.