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Old 07-11-2003, 02:48 AM   #1
Scooby Specialist
Member#: 2213
Join Date: Aug 2000
Chapter/Region: NESIC
Location: Raymond, NH USA
1995 Impreza w/EJ255
Brilliant Red

Default Cleaning now that heads are off? And Valve adjust question?

Okay I have my heads off and they have been sent to be O-ringed. Now that the heads are off I see that there is alot of buidup on the pistons. How should I clean this up so that evertying is nice when I put it back together. I don't want a higher compression ratio due to deposits on the pistions.

I also have to adjust the valves when I put my cams and such back in (DOHC) and I woudn't mine some advice or pointers. I do have the Haynes manual to help me through it but any addition tips would be apprecited.
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Old 07-11-2003, 04:06 AM   #2
Scooby Guru
Member#: 6637
Join Date: May 2001
Chapter/Region: MAIC
Location: Manassas
2009 Acura MDX Sport


when I took off my heads, I bought some carb cleaner, and spray it on the pistons, let is sit for a few minutes, then scrub them down with a soft wire brush to make sure you don't scratch them..
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Old 07-11-2003, 04:46 AM   #3

Member#: 922
Join Date: Feb 2000
Chapter/Region: MWSOC
Location: Schaumburg, IL
16 WRX (white)
04 FXT (red)


Carbon buildups are normal. I think I've understood that if you use a misting spray bottle of water and spray the intake charge as it is running, you can actually cause the carbon to burn/come off.
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Old 07-12-2003, 03:31 AM   #4
Eric SS
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Member#: 1914
Join Date: Jul 2000
Chapter/Region: SWIC
Location: 2014 Q60S, 2016 Chevy SS
2000 2.5RS w/ EJ22T
swap and N20. gone. : (


I use break cleaner. That stuff gets anything off.

But honestly, you don;t need to worry about it uping your compression. Just get on it real hard a couple times and it will clear a lot of that away.
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Old 07-13-2003, 06:44 AM   #5
Unsung Boxer
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Member#: 37196
Join Date: May 2003
Location: WA state

Both Brake and Carb cleaner will work fine for the job. I prefer brake cleaner. Go ahead and spray it down best you can and wipe it off. Should get it good. I would even put a little motor oil back into each piston, just because that brake cleaner might take alot of the initial oil off of the cylinder wall.

As far as valve lash goes, I believe that you need to use an angled feeler guage. Unfortunately if you dont have one, they cost almost as much as the adjustment does itself.

I suggest bringing the heads to any repair shop and having them adjust the valve lash there. I dont think they should charge you more than an hour (about 60 bucks) to do it, since you have the heads off, and the valve covers off.

Hope that helps
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