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  1. #11
    Join Date
    May 2018
    Location
    Woking, UK
    Posts
    155

    Default Anybody replaced a valve guide?

    Iíve got my sucker on a stick and can of paste at the ready. This activity hasnít changed over time, I remember doing this years ago.


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  2. #12

    Default Re: Anybody replaced a valve guide?

    Years ago when I had to replace valves on my Honda VF400(4 valves per 100cc cylinder) I used a piece of thin pipe over the valve stem and then managed to attach it to a hand drill to speed up the operation.
    You might be able to do the same .
    2002 pure semi auto 64000 miles

  3. #13
    Join Date
    May 2018
    Location
    Woking, UK
    Posts
    155

    Default Anybody replaced a valve guide?

    there was a tool you could get from Halfords that rotated a sucker backwards and forwards when used with a drill. Never had one but maybe they still exist. Iíll probably just do it by hand the old way. Iíve even got a tin of engineers blue somewhere, if I can ever find it.


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  4. #14
    Join Date
    Sep 2016
    Location
    Burnley
    Posts
    609

    Default Re: Anybody replaced a valve guide?

    If you have re-cut seats and reground valves then it should only take 15 seconds or so to grind each in.

    Under no circumstances should you ever use a drill to do it, piles of heartbreak and woe will ensue.

  5. #15
    Join Date
    Jun 2005
    Location
    Aberdeenshire
    Posts
    2,077

    Default Re: Anybody replaced a valve guide?

    Gunson Eezi-Lap. Saves hours of manual valve lapping.

  6. #16
    Join Date
    Sep 2016
    Location
    Burnley
    Posts
    609

    Default Re: Anybody replaced a valve guide?

    Quote Originally Posted by tolsen123 View Post
    Gunson Eezi-Lap. Saves hours of manual valve lapping.
    Unless you are doing a lot of heads you are doing it wrong if it takes hours by hand.

  7. #17
    Join Date
    Jun 2005
    Location
    Aberdeenshire
    Posts
    2,077

    Default Re: Anybody replaced a valve guide?

    I am simply quoting from the manual.
    Anyway it takes more than a few seconds to lap in a valve. Shiny metal on valve seal area must be lapped until it turns grey. Takes minimum 3 minutes per valve with the Eezi-Lap powered by a good Lidl cordless drill.

  8. #18
    Join Date
    Sep 2016
    Location
    Burnley
    Posts
    609

    Default Re: Anybody replaced a valve guide?

    Quote Originally Posted by tolsen123 View Post
    I am simply quoting from the manual.
    Anyway it takes more than a few seconds to lap in a valve. Shiny metal on valve seal area must be lapped until it turns grey. Takes minimum 3 minutes per valve with the Eezi-Lap powered by a good Lidl cordless drill.
    Takes under 15 seconds with a newly cut seat and a newly faced valve if they have been cut correctly. That is assuming all the rest is in good order. I have done hundreds of them in the last 50 years on hundreds of reconditioned heads from all manner of engines.

  9. #19

    Default Re: Anybody replaced a valve guide?

    Quote Originally Posted by Mjolinor View Post
    Takes under 15 seconds with a newly cut seat and a newly faced valve if they have been cut correctly. That is assuming all the rest is in good order. I have done hundreds of them in the last 50 years on hundreds of reconditioned heads from all manner of engines.
    100% this, lapping should be a very quick operation if the valves and seats are fresh. Grinding away for hours to get badly pitted seats to seal recesses the valve and is a good indication that they should have been recut.

  10. #20
    Join Date
    Jun 2005
    Location
    Aberdeenshire
    Posts
    2,077

    Default Re: Anybody replaced a valve guide?

    Just wonder if 15 seconds is average lap time?

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