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Old 03-06-2019, 07:06 PM   #1
kimcheefists
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Exhaust Valve Stem Seals Leaking Oil

Hi everyone,

Like the title states, the #3 cylinder (passenger side rear) exhaust valve stem seals allowed oil to leak into my exhaust system creating a ton of smoke when the car was under load and accelerating from a stop.

At the time the problem began, mods included a JDL turbo kit, Verus AOS, and a JDL oil cooler.

I was speaking in past tense because my engine is now getting built with forged bottom end components and Supertech valve springs since the engine needed to be removed in order to fix the valve stem seal leak anyway. I’m also changing the AOS to Radium’s dual catch can.

The reason for this post is because the mechanic that’s doing the engine work stated that he believes it’s a common issue with the FA20 motors. He said that a WRX came into his shop with the same issue...

Has anyone else had this problem? This rebuild has obviously taken a hit to my wallet and a little worried that the problem will surface again in the future..Any responses are greatly appreciated!
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Old 03-07-2019, 01:23 AM   #2
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I haven't read anything on this forum about bad valve stem seals. -


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Old 03-07-2019, 05:44 AM   #3
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Exhaust Valve Stem Seals Leaking Oil

Yeah I haven’t seen anything either but wanted to throw the question out to the community anyway...

Does anyone know what usually causes valve stem seals to go bad in the first place?


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Old 03-07-2019, 11:08 AM   #4
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Usually with high mileage 5SFE had that issue. Certainly not a very common problem with toyota engines.
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Old 03-07-2019, 11:24 AM   #5
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Usually with high mileage 5SFE had that issue. Certainly not a very common problem with toyota engines.
You mean Subaru engines.
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Old 11-11-2024, 02:57 AM   #6
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Arrow I have the same issue

Quote:
Originally Posted by kimcheefists View Post
Hi everyone,

Like the title states, the #3 cylinder (passenger side rear) exhaust valve stem seals allowed oil to leak into my exhaust system creating a ton of smoke when the car was under load and accelerating from a stop.

At the time the problem began, mods included a JDL turbo kit, Verus AOS, and a JDL oil cooler.

I was speaking in past tense because my engine is now getting built with forged bottom end components and Supertech valve springs since the engine needed to be removed in order to fix the valve stem seal leak anyway. IÂ’m also changing the AOS to RadiumÂ’s dual catch can.

The reason for this post is because the mechanic thatÂ’s doing the engine work stated that he believes itÂ’s a common issue with the FA20 motors. He said that a WRX came into his shop with the same issue...

Has anyone else had this problem? This rebuild has obviously taken a hit to my wallet and a little worried that the problem will surface again in the future..Any responses are greatly appreciated!



I am having the same issue where my cyl 3 plug gets fouled by a lot of carbon build up. I am boosted. Burns oil when under load.
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Old 11-11-2024, 04:41 PM   #7
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I'd look at rings before valve stem seals on this engine. Especially boosted.
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Old 11-11-2024, 07:19 PM   #8
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Exhaust valve stem seals leak under vacuum. Need a leak down done.
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Old 11-12-2024, 10:16 AM   #9
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Exactly. Boost would be pushing back into the head under load.
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Old 11-12-2024, 11:51 AM   #10
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I'll bet the #3 piston ring land is cracked....and it's not a spring issue....
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Old 11-13-2024, 03:46 PM   #11
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I wouldn’t rule out something simple like a bad PCV yet, but fouling number 3 all the time is not promising.

Comp test
Leak down test.

Everything else until then is just guessing.
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Old 11-16-2024, 10:49 AM   #12
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Outfront Motorsports suggested including new valve guides when I was shopping for a built short block. They stated the guides are often troublesome eventually.
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