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interesting rocker/cam wear pattern

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    #1

    interesting rocker/cam wear pattern

    So, I was doing my spark plug tube seals along with a valve adjustment and valve cover reseal, and when I took the rocker carriers off the head I noticed this interesting wear pattern on the intake rockers for cylinder 4 (closest to the distributor). It seems to be not making full flat contact on the cam.

    The car's already back together and I never noticed any issues with assembly or even that it was out of adjustment more than the other valves, and the wear on the cam wasn't bad. but is there something else to be adjusted to make it wear flatter?

    Obviously it's been like this from the factory, and has lasted 125k miles without any issues- i'd guess now that it's "worn in" there's no point to fucking with it. But I'm just curious if anyone's seen this before in factory engines.

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    #2
    when was the last time the head was worked on?

    there are two possible scenarios I would initially guess it may be,
    1. the rocker has worn a groove into the rod that it pivots on. wouldnt be noticable from the top really, might need to pull the rocker assembly off and inspect closer.
    2. less likely, but maybe the valve is bent and the pressure on the lifter is offset?


    - 1993 Accord LX - White sedan (sold)
    - 1993 Accord EX - White sedan (wrecked)
    - 1991 Accord EX - White sedan (sold)
    - 1990 Accord EX - Grey sedan (sold)
    - 1993 Accord EX - White sedan (sold)
    - 1992 Accord EX - White coupe (sold)
    - 1993 Accord EX - Grey coupe (stolen)
    - 1993 Accord SE - Gold coupe (sold)
    Current cars:
    - 2005 Subaru Legacy GT Wagon - Daily driver
    - 2004 Chevrolet Express AWD - Camper conversion

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      #3
      Originally posted by cp[mike] View Post
      when was the last time the head was worked on?

      there are two possible scenarios I would initially guess it may be,
      1. the rocker has worn a groove into the rod that it pivots on. wouldnt be noticable from the top really, might need to pull the rocker assembly off and inspect closer.
      2. less likely, but maybe the valve is bent and the pressure on the lifter is offset?
      As far as I know, the only kind of head work ever done to this engine was a valve cover reseal. A valve cover reseal that, mind you, definitely didn't involve removing the cam carriers to get the spark plug tube orings based off how hard the old orings were, so i don't think it's any assembly error. The car only has 125k miles.

      You can also still see the factory fly cut milling on the rocker face where it hasn't worn, so it makes me think it's been this way from the factory. Casting error on the rocker?

      At any rate i may have the valve cover off again this coming weekend, I think my rtv job in one of the gasket corners wasn't smeared right and it may be seeping again. So i can look at it then. Thanks for the things to think about!

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