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Old 05-16-2019, 12:20 PM   #1
SubieHunter
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Default 2006 Impreza headgasket issue?

I just bought an Ď06 Impreza non-turbo with 5spd with 128,000 miles. Since getting the car home Iíve replaced the timing belt, all pulleys and water pump (All new OEM). Filled her up with the long life coolant and Subaru conditioner. I spent quite a bit of time trying to burp the system, even raising the front, using the spill-proof funnel and running the heater on full hot.
What I notice and what concerns me are bubbles in the reservoir after driving. The bubbles do not come up after a start no matter how long I let the car idle, and they completely go away after 5 minutes of idling the car after driving. I would not be surprised if there is a HG leak, however knowing that the bubbles do not come up at all when idling, or after letting the car idle after driving for 5 minutes, I am wondering the severity of the HG leak if there is one. The car has never overheated on me, and the needle stays right above the 1/3 line on the temp gauge. Any bubbles that do come up are no bigger than 1/2 inch, and there are at most 2 every second. Any insight would be much appreciated! Glad to provide any more info. Thanks!
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Old 05-16-2019, 10:48 PM   #2
Charlie-III
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I would slightly overfill the overflow tank and keep an eye on it.
From cold to operating temp, the level in the overflow should only rise about 2" (5mm). It should drop back to a normal level after sitting a few hours/overnight.
If you see the cold level drop day by day, add some more coolant and watch again.
Air in the system will make the level rise quite a bit.
Failing HG's will make the level rise a lot.
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Old 05-19-2019, 10:07 AM   #3
SubieHunter
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Thank you for the reply. I will go ahead and check the levels to see if they rise too much, and top it off if air bubbles clear themselves out. Considering I havenít before had any overheating, I never considered that the levels would rise! I appreciate the insight
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Old 05-21-2019, 07:41 PM   #4
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and you should be able to see oil residue underneath on the bottom of the engine where the heads and block come together. This doesn't mean the HG is leaking badly - but search online - Same EJ253 was used across the Subaru line - for what may be considered 'bad'.

Also, the Phase 2 ('99+) 2.5's were external leakers more than the internal leaks that afflicted the Phase 1. Those would leave a nasty oily residue in the overflow tank.
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Old 05-23-2019, 07:19 PM   #5
J Bone Capone
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Default Cylinder head casting options

This may have already been answered so if anyone has a link that would be great.

I have a 2006 Impreza with an EJ253. Nothing special, all factory. I have the head gasket leak problem. I am going to replace the heads myself with refurbished heads. However, I have looked every that I can see on the heads for a casting number and can't find it. I have it boiled down to probably being a v25 or b25 cast. My question is if they are interchangeable? I can find v25 heads everywhere but b25 are more difficult to come by (at a decent price anyway). Any help is much appreciated.
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Old 05-23-2019, 07:25 PM   #6
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Quote:
Originally Posted by J Bone Capone View Post
I am going to replace the heads myself with refurbished heads.
Why replacing heads? That's an uncommon step. R&R the originals, new HG, new seals as needed, Tbelt, WP, etc. and drive away.
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Old 05-23-2019, 07:28 PM   #7
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Quote:
Originally Posted by wtdash View Post
Why replacing heads? That's an uncommon step. R&R the originals, new HG, new seals as needed, Tbelt, WP, etc. and drive away.
I am doing it that way so I don't have to take the heads to a machine shop. Trying to save time.
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Old 05-23-2019, 07:42 PM   #8
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Quote:
Originally Posted by J Bone Capone View Post
I am doing it that way so I don't have to take the heads to a machine shop. Trying to save time.
gotcha. ...so the heads from any '2006-2010 (or last year of the EJ), should be compatible, but I don't know part numbers.

But those v/b25 heads kinda/sorta sound like turbo heads....so I can't help.
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Old 05-23-2019, 07:50 PM   #9
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Quote:
Originally Posted by J Bone Capone View Post
I am doing it that way so I don't have to take the heads to a machine shop. Trying to save time.
Do you even need to take them to a machine shop? Has it overheated, or is it seepage? Either way, pull the heads, check them for warpage (not common) or cracks (also not common) Then clean the surfaces, prep them and reinstall. Head damage is just not common enough that I would look at buying spare heads.
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Old 05-23-2019, 07:55 PM   #10
J Bone Capone
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Quote:
Originally Posted by Hondaslayer View Post
Do you even need to take them to a machine shop? Has it overheated, or is it seepage? Either way, pull the heads, check them for warpage (not common) or cracks (also not common) Then clean the surfaces, prep them and reinstall. Head damage is just not common enough that I would look at buying spare heads.
I probably don't need to but everything that I have seen about replacing the gaskets so far has said to have the heads machined and fixed up. I decided to buy re-manufactured ones to replace the old heads so I can do the job in one day instead of waiting for them to be machined. I'm trying to get at least another 100,000+ out of it so I am being overly cautious.
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Old 05-24-2019, 12:44 AM   #11
Charlie-III
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Quote:
Originally Posted by J Bone Capone View Post
I probably don't need to but everything that I have seen about replacing the gaskets so far has said to have the heads machined and fixed up. I decided to buy re-manufactured ones to replace the old heads so I can do the job in one day instead of waiting for them to be machined. I'm trying to get at least another 100,000+ out of it so I am being overly cautious.
Turbo Subaru seem to need deck or head machining.
NA Subaru are usually flat, no machining.

Lap valves, replace valve seals......good to go.
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Old 05-24-2019, 04:19 PM   #12
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Indeed,


Thanks for adding on the valve seals/lapping. Completely forgot about those.
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