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Old 03-19-2013, 10:21 AM   #1
njsubi86
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Join Date: Nov 2009
Chapter/Region: Tri-State
Location: New Jersey
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2004 WRX SRR
'01 OBW, '86 944 Turbo

Default Head removal 2002 WRX

2002 WRX stock

Quick questons:

1. Can head be removed on turbo side by just unboltng exhaust manifold nuts on head and lifting head up and off after unbolting head from block? Or does the uppipe have to be unbolted as well, and the entire exhaust manifold removed frm both heads?
o
2. I am told the heads must be machined to "reverse" the effects of possible warpage if the motor was overheated. Is putting a straight edge on the heads a reliable way to tell if they're warped? If so, and they appear straight, is it wise to reinstall them without machining them, or is it lik erolling the dice to do so?

Thanks
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Old 03-19-2013, 10:35 AM   #2
vkyle8
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As far as number 2 goes you'll need a proper straight edge and feeler guages to measure deck warpage
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Old 03-19-2013, 10:36 AM   #3
madkayaker
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04 sti, 11 forester xt

Default

1. Are you pulling the head with the engine in? It would be faster to just pull the whole engine imo.

2. A lot of people get away with block sanding the head so that they have a fresh clean surface to seal. I have done a couple of heads that way with no issues. The dealers use a sanding disk and an air tool to resurface them, and I've heard of a lot of them coming back with blown gaskets. The best way would be to take them to a machine shop and have them machined and might as well let them pressure test the valves while they're at it.

https://www.youtube.com/watch?v=5UYkfuTyugk
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Old 03-19-2013, 10:41 AM   #4
njsubi86
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'01 OBW, '86 944 Turbo

Default Head Warpage

Is there an acceptable tolerance for warpage, or does the differential between the head and the staightedge have to be less than a certain value? I will be installing stock head gaskets purchased at the Suby dealership in my local area. Also, I heard if the heads are warped beyond a certain point, they are trash anyway. I suppose the same goes for the block if it is warped beyond a certain amount. I was hoping to just be able to reinstall everything and be done with it, but I'm getting the vibe this won't be the case. I would really hate to find out the heads are leaking and have to pull the motor again and repeat the entire process to fix this car.
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Old 03-24-2013, 06:07 PM   #5
madkayaker
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All of the info you are seeking is in the service manual.

Last edited by Mulder; 03-24-2013 at 06:30 PM.
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Old 03-24-2013, 07:07 PM   #6
devilmademedoit
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Why are you pulling heads? Gaskets blown? Did it overheat? I've done head gaskets on a 2.5 legacy and my wrx legacy I left motor in wrx motor out. Way easier and less stressful with motor out. You can pull a wrx motor in under 3 hours
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Old 03-24-2013, 07:09 PM   #7
devilmademedoit
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Where in jersey are you? The machinist I used was very reasonable Heads came out beautiful
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