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Old 08-30-2015, 11:53 AM   #1
apollopot
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Default Importance of valve cover gasket replacement? 07 impreza

Hi,

I was just wondering if anyone had thoughts on how important it is to actually replace the valve cover gaskets? I have some oil getting on my spark plug boots, and I have 200,000 km on the car. Hoping to have the car for another 5 years or so but not sure how badly this needs to be done since it's not actually causing misfires as far as I can tell.
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Old 08-30-2015, 12:41 PM   #2
Hoon Goon
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It's fine as long as you aren't concerned about a nasty, oily, stanky mess that no one will want to touch. The situation will not improve, but sure you can drive it that way. I wouldn't.
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Old 08-30-2015, 01:16 PM   #3
g-heap
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Also, you won't notice if something else bust a (oil/coolant/whatever) leak.

It's not expensive to replace the seals, particularly if you intend to keep the car for several years. The only thorny bit is squeezing the wrench onto some of the valve cover bolts may be a pain depending on your model.
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Old 06-04-2019, 12:39 PM   #4
PaulVONR
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Default Valve Cover Gaskets on a 98 RS

Maybe someone here can point me in the right direction. I have a 1998 Impreza RS. Going to be pulling the engine to do head gaskets. When I look up getting valve cover gaskets, I need to know the engine number in able to order the correct gaskets. The main spot on the block has no numbers or anything stamped into it. The only thing I can find toward the front is the EJ25 stamp. Is there anything in the VIN that could help? Thanks!
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Old 06-04-2019, 12:43 PM   #5
Jersey Man10
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Call Subaru and give them your vin and ask for the parts.
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Old 06-04-2019, 01:01 PM   #6
yarrgh
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Try RS25.com. I'm pretty sure the 98 had the EJ25D, which has DOHC. 99+ they went with the EJ251 - SOHC. Providing the VIN to a dealer usually assures that you'll get the correct parts.
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Old 06-04-2019, 08:35 PM   #7
CosmoTheCat
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Quote:
Originally Posted by yarrgh View Post
Try RS25.com. I'm pretty sure the 98 had the EJ25D, which has DOHC. 99+ they went with the EJ251 - SOHC. Providing the VIN to a dealer usually assures that you'll get the correct parts.
Easy way to verify that is to just pop the hood and look at it.
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Old 06-14-2019, 12:47 AM   #8
DropStone
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Would a leak in the valve cover result in pressure exchange between barametrux pressure and engine internal pressure? Donít those to pressures need to be separate from each other?
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Old 06-18-2019, 10:26 PM   #9
jake14001
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Can be done by hand but one of the bolts on the passenger side of my Saabaru is stripped and the shoulder is seized in the valve cover. Iíd wait till thereís a large amount of oil in the tube before messing around with those bolts.
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Old 07-02-2019, 02:54 PM   #10
travisdonnelly0914
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not expensive, might as well replace it to keep everything clean
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Old 07-03-2019, 06:30 PM   #11
Ernest
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I did it myself. Only lasted about two years because I obviously did not do something right with the gasket. Paid a professional to do it for $400 bucks. No leaks for the last 3 years. It was a pain in the ass to do, I would pay for it again but it will be awhile.
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Old 07-29-2019, 01:24 PM   #12
jthewarrior
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Quote:
Originally Posted by DropStone View Post
Would a leak in the valve cover result in pressure exchange between barametrux pressure and engine internal pressure? Donít those to pressures need to be separate from each other?
Answer: Sort of.....Basically the intake manifold vacuums and piston blowby air are driving the crankcase pressures. The engine has a PCV system to help it deal with these sources of air or vacuum so it doesn't over- or under-pressurize, as well as cycle dirty air out of the crankcase to help with oil life.
Most crankcases are happy at Ī7kpa and in general run and just below atmospheric pressure anyway(-1 or -2 kPa). Plus a PCV system will flow a lot more air than most gasket leaks. A valve cover gasket leak is usually too small to make a large difference in crankcase pressure when your engine is running.
Even if you have a large leak, the crankcase will just push a little unmetered air out or in through the leak and live around 0 kPa, which is fine for a little while. But you'd have a ton of oil on the outside of the engine from the leak, the engine would catch on fire, you'd hit a bus full of nuns because you wouldn't be able to steer your car through the flames coming out your hood and then when you wake up in heaven, you'd have a bunch of pissed off nun's to content with.
Moral: Fix your valve cover gasket leaks before you end up getting the snot beat out of you by 20 angry nuns.
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Old 08-22-2019, 10:19 AM   #13
chopshopdwrx
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Definitely replace that in the near future. If its leaking, it'll only get worse. You will be able to drive it as long as you keep your oil levels up, but don't expect to get 5 more years out of it running like that.
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