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Old 06-02-2012, 01:09 AM   #1
Cammed n Slammed
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Default Oil leak near timing belt cover only under throttle.

Hi guys, I've been doing alot of research due to the fact that my 04 sti has an oil leak near the timing belt cover. Yes, I know that this has been covered a million times, BUT my situation might be unique.
My sti has a brand new oem block and the heads were sent to subaru to be inspected. The rest of the motor has 75k on it along with the body. After the motor was put back together there was the infamous leak near the timing belt cover that runs along the block. Cam seals obvious culprit. Took it to a reputable shop that we've been taking performance vehicles to for years, they replaced the cam seals and put in a new timing belt (even though the one on there only has <900 miles along with the rest of the motor).
Check the car out on the lift in the shop and it seemed to be running dry. No issues. So I drove it home and on a short road trip and when I was done, the leak was back. However, now the leak is only present when on the throttle, and it dumps quite a bit of oil, there's quite a bit under the car after driving. When we had it up on jack stands and let it idle for 10 mins no leaks. Then we got it up to about 2k and just held it for a 30 seconds and probably 15 drips came out. Checked oil levels and lost maybe 1/4 of a quart of oil on the 3 hour roadtrip, maybe less.
This situation seems unique to the other cam seal leaks that i've been reading up on. If anyone can chime in I'd appreciate it. I've read something about the need for some fuji seal near the cam seals, not actually on them. A buddy of mine works for subaru and I'm gonna take it there tomorrow morn and he said he'll throw it up on the lift and see if we cant see whats goin on in there. The shop is reimbursing me $400 because clearly they can't fix the issue or can't do it correctly. I know subaru will charge more but Hopefully my buddy can diagnose it in house and maybe do the labor on the side.

Any advice/ideas/experience/suggestions much appreciated. Thanks fellas
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Old 06-02-2012, 10:40 AM   #2
APM Tuned
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So, you ran the motor with the covers off and couldn't find exactly where it's leaking from?

-Mark
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Old 06-02-2012, 11:14 AM   #3
jonthesloth
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Thank you for being thorough in your description.

Now, Is the oil dripping from the cam seals? A guy on the forums just replaced his cam seals and it was still leaking, turns out he forgot to put the spring back in.

Not sure if a PCV valve would cause this, but did you check this as well since you have an 04?
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Old 06-03-2012, 09:45 PM   #4
Cammed n Slammed
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Quote:
Originally Posted by APM Racing View Post
So, you ran the motor with the covers off and couldn't find exactly where it's leaking from?

-Mark
Well I took the car to subaru and my friend immediately said cam seals. So apparently the other shop either didn't do it right, or didn't do it at all. My friend had to order the cam seals so I'm currently waiting for those to come in before we start the work on our next day off. We are going to get the timing belt cover off and hopefully he will be able to diagnose whats going on in there.

Also, wasn't aware of the spring with the cam seals. I'll have to mention that to the mech who's going to be working with me. Would still appreciate any advice before we get into this. He seems quite competant as he's been a tech at subaru for 4 years. I'm just personally nervous as I can't drive the car at all right know for fear of losing a ****load of oil in the process.
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Old 06-03-2012, 09:50 PM   #5
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btw new oem oil pump was put in with the new block less than 1000 mi ago also.
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Old 06-03-2012, 09:58 PM   #6
jaredperry
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Do you by chance have any images of the leak to help better understand?
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Old 06-05-2012, 10:01 PM   #7
Cammed n Slammed
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Ok. We replaced the cam seal with a fresh one today and it is literally PISSING oil under throttle. Please help me guys. I am at a loss for what to do. When we had the cam seal off we noticed that there is a nick on the cam which is located near where the seal would go. The Subaru mech who came over today and worked on my car could not put his finger on exactly what would cause this but feels like its probably the nick causing the leak.



Please help guys. I cannot drive my car at all and I'm seriously stressin
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Old 06-05-2012, 10:36 PM   #8
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are you greasing the seal before installing? what are you using to install the seals?
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Old 06-05-2012, 11:48 PM   #9
Cammed n Slammed
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yes seals have been lubricated properly both times, the one we removed today (less than a week old) wasn't burnt at all. And by "install" do you mean how did we put them in? We just used a socket and lighly tapped it with a small hammer.
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Old 06-06-2012, 12:14 AM   #10
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Did the seals looked like they were getting pushed out?
Was the PCV valve replaced?
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Old 06-06-2012, 12:25 AM   #11
Cammed n Slammed
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I guess my question is could that little gouge in the cam be causing a major oil leak as the mechanic suspects? I have read about another guy who changed his cam seals a few times to no avail. Turns out he nicked his cams and sanded them down with really fine sandpaper and hasn't had any leak since. But I'm not sure the severity of his nick or the severity of the leak.
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Old 06-06-2012, 12:26 AM   #12
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I'll ask about the Pcv valve I'm not sure.
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Old 02-13-2015, 07:05 PM   #13
optiks
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Hey old thread I know. Did you solve this. Im having the exact same problem as youre describing with my fresh rebuild.

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