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Thread: removing carbon and soot build up on back of valves

  1. #1
    ethanol sniffing Backyard Mechanic adamaw11's Avatar
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    Default removing carbon and soot build up on back of valves

    After taking my intake manifold off, I found what looks like some significant build up on some of the valves, they don't all look the same.

    I think I know at least part of the reason why, to do with leaking injectors and sucking in oil vapour possibly, no oil catch can for too long.

    My question is, can I actually do anything to remove any of this build up while the valves are there in the head? by poking some sort of scraper through the ports to scrape bits off?

    I havn't been game to poke anything at all yet even to see how hard the caked material is. I imagine the valves should be held in there pretty firmly, but I need some more opinions on this.

    Should I just leave it alone if it was running ok before? and ignore the appearance of the valves until next time I take the head off?

    Or is it worth trying: scraping, compressed air, spraying with throttle body cleaner, etc.

    I couldn't get it to show clearly in the photos, but it looks like there's some flaky stuff stuck on one of the valves which *might* come off easily




    http://www.toymods.org.au/forums/showthread.php?t=83259
    '88 A.D.M aw11 '98 4age 20v blacktop
    NA: [email protected] at willowbank. On E85 with 6psi boost: [email protected] ~8psi: 13.187 @169.9kmh. >10psi: 12.9 rod fragments @ 174mm holes in block
    daily: '93 ae101 Levin coupe. Motorbike: '09 Suzuki GSR600: [email protected] at Willowbank

  2. #2
    Junior Member Backyard Mechanic jondee86's Avatar
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    Default Re: removing carbon and soot build up on back of valves

    Standard procedure for engines with direct injection that are prone to carbon buildup on the intake
    valves, is walnut blasting. The process does require a "plug" to seal the inlet port while blasting and
    this might be a problem with a port injected engine like the 4AGE that normally would not require
    blasting. You could enguire at your local Euro car specialist to see if they can help. They should have
    a walnut (ground walnut shells) blasting setup in house.

    Cheers... jondee86

  3. #3
    ethanol sniffing Backyard Mechanic adamaw11's Avatar
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    Default Re: removing carbon and soot build up on back of valves

    I tried a bit of poking and scraping with screwdriver, and was able to get a little bit off, then used compressed air to blow some of the loosened debris out.

    I'm convinced now that with enough patience and the right tools, they could be cleaned up to some extent just with access through the ports with the manifold off.

    Once I've got it running again, I think I'll take the manifold off again and spray with some throttle body cleaner and see how much more I can remove. Then refitting the mani etc and starting up should blow any extra debris out the exhaust.

  4. #4
    Junior Member Automotive Encyclopaedia
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    Default Re: removing carbon and soot build up on back of valves

    Quote Originally Posted by adamaw11 View Post
    Should I just leave it alone if it was running ok before? and ignore the appearance of the valves until next time I take the head off?
    Yes. Just drive it. Ain't broke, don't fuck with it.
    Also, to ask, about the manifold coming off?
    'I've scrapped better.' John stated when asked about the car by the guy with the silver tipped cowboy boots!

  5. #5
    ethanol sniffing Backyard Mechanic adamaw11's Avatar
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    Default Re: removing carbon and soot build up on back of valves

    Quote Originally Posted by allencr View Post
    Yes. Just drive it. Ain't broke, don't fuck with it.
    Also, to ask, about the manifold coming off?
    current project is fitting a new intake manifold, thats why I happened to see directly into the ports and start worrying about the valves.
    http://www.toymods.org.au/forums/showthread.php?t=83259
    '88 A.D.M aw11 '98 4age 20v blacktop
    NA: [email protected] at willowbank. On E85 with 6psi boost: [email protected] ~8psi: 13.187 @169.9kmh. >10psi: 12.9 rod fragments @ 174mm holes in block
    daily: '93 ae101 Levin coupe. Motorbike: '09 Suzuki GSR600: [email protected] at Willowbank

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