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Do I Need a New Camshaft?

Discussion in 'XJ Technical Chat' started by Joiner, Jul 28, 2013.

  1. Joiner

    Joiner Member

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    8 of my 20 valves are showing 0 clearance, and some of my cam lobes are looking like this:
    [​IMG]
    Is this too much wear or can I still use this camshaft?
     
    Joiner, Jul 28, 2013
    #1
  2. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Are you talking about the "polished" areas?

    Just looks polished to me, I don't see excessive wear.

    If you're truly worried about it, roll the cam so you can get a digital caliper on it and measure the lobe from its butt to its tip; that spec is published in the service manual.

    The valves are showing zero clearance because they've pounded themselves into the head. Good catch.
     
    bigfitz52, Jul 28, 2013
    #2
  3. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    I think what he's trying to show is the 'blue-ing' of the lobe tips. However, as long as they are not scored or scratched, I'd work at getting the valves back into spec, and then you should be good-to-go.

    Like Fitz said, if you're really concerned with measurement, check the size of the lobe. I'm sure you'll be fine.

    Dave F
     
    hogfiddles, Jul 28, 2013
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  4. Joiner

    Joiner Member

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    Just had me worried, all of the valves showing 0 clearance have that polished look and the others didn't. While I know how to build engines I haven't done it as much as I'd like. The engines we tore apart in high school and college didn't have much wear. Thank you.
     
    Joiner, Jul 28, 2013
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