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Old 12-17-2006, 10:22 AM   #1
uturn
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Join Date: Oct 2006
Chapter/Region: E. Canada
Location: Ottawa, ON
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2000 Impreza 2.5RS
Blue Ridge Pearl

Default Spark plug o-ring replacement

So I've discovered I need to change the spark plug o-rings in my MY00 2.5RS. Will the o-rings be completely accessible/visible once the valve cover is off? I don't have a FSM for my specific year...

I've never removed the valve cover before but am familiar with tools. Any tips from the guys who've done this o-ring change before? Besides 3.6ft-lbs on the cover bolts from what I've found here.

Thanks.
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Old 12-17-2006, 10:38 AM   #2
Charge
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Is that because there's oil in the spark plug galleys?

I found a decent amount in two of mine last year(of course...one on each side) but after swapping the car's running fine and no significant oil loss between changes. I haven't done anything else about it yet.

I was thinking I'd have to do the valve cover gaskets(which I'd obviously do with the valve covers off), but perhaps the O-rings are the real culprits?
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Old 12-17-2006, 12:53 PM   #3
Hayes
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The O-rings are visible and easy to replace with the valve covers off. I also replaced the 10 rubber washer seals that hold the valve cover on in addition to new valve cover gaskets. Believe in the 3.6 ft/pounds on the shoulder bolts.
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Old 12-17-2006, 02:38 PM   #4
uturn
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Blue Ridge Pearl

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Correct, I pulled the plugs and one was completely covered in oil, except the threaded part. The socket was covered too by the time I removed it.

From what I found, its the o-rings that are the cause, and you have to replace the valve cover gasket and those 10 (14?) rubber washer seals when accessing under there.

I've got 215,000kms on my car so I can see why these might be baked.
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Old 12-17-2006, 03:07 PM   #5
williaty
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Regal Blue Pearl

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I think I may have this problem too. When I changed my plugs at 30k miles, one plug was dirty on the outer ceramic and oily on the threads. Since the electrode itself didn't appear fouled by oil, I assume the oil in the threads got laid down as I removed the plug. Do I need to do this replacement too?

Here is a picture (the bottom plug is the problem plug):

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Old 12-17-2006, 11:19 PM   #6
uturn
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Blue Ridge Pearl

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Mine was much more severly covered in oil on the ceramic part. The boot was covered and so was the socket when it came out with the plug. Everything was dripping oil. And mine was misfiring badly enough to get a blinking CEL.

You might want to research piston rings as the cause, from what I've read so far.
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Old 12-25-2006, 02:33 PM   #7
Charge
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Hmmm...mine were primarily dirty on the boot. Outside of a few seconds of rough running right after the swap(probably from oil leaking down into the cylinder), it ran fine afterwards...and had exhibited no issues prior to the plug change.

I've only got 70K on the car. Hopefully it was just a minor leak. One more thing to get fixed before auto-x season starts I guess.

Time to go looking for cost of parts.
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Old 12-26-2006, 10:31 AM   #8
kaisersouse
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FYI: when looking to replace mine I found a few places that refer to them as "spark plug bonnets"
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Old 12-28-2006, 04:32 PM   #9
Calamity Jesus
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Yeah, they're right at the top of the spark plug tubes, just yank off and replace with the new ones. Plan to check your valve lash and replace all the other gaskets (the valve cover gasket & bolt washer/gaskets) while you're in there.
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