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Diversion 600 valves

Discussion in 'XJ Technical Chat' started by Huw, Nov 3, 2023.

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  1. Huw

    Huw New Member

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    I've just done my valve clearances due to a ticking sound especially when cold. Replaced 6 shims and all clearances seem to be within spec now but it's still ticking. Could it be a valve seat issue? If so how difficult/costly is it to repair?

    Looking at the service manual it seems like it would be a bit more involved than I really want to get
     
    Huw, Nov 3, 2023
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  2. bensalf

    bensalf Well-Known Member

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    what year is your diversion ?, does it have an automatic cam chain tensioner, or a manual one ?
    have you adjusted the chain tension?
    stu
     
    bensalf, Nov 3, 2023
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  3. bensalf

    bensalf Well-Known Member

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    how many miles on the clock has the engine done?
    unlikely to be a valve seat issue, unless one "or more" of the valves was tight with no clearance, or extremely high milage
    valve seat work involves removing head and either re-cutting or re-seating with new seats, quite involved
    stu
     
    bensalf, Nov 3, 2023
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  4. Huw

    Huw New Member

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    2003, automatic cam chain tensioner I think. 16000 miles on the clock
    6 valves around .02mm under spec, the other 2 were okay
    ticking seems to be at 1 tick per 2 rpm (at least at idle, it's harder to hear at higher revs)
     
    Huw, Nov 3, 2023
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  5. bensalf

    bensalf Well-Known Member

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    check your exhaust studs are tight at the joint to the cylinder head, that can cause the ticking sound
     
    bensalf, Nov 4, 2023
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  6. Huw

    Huw New Member

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    it was the exhaust bolts! I sprayed a little WD-40 to try avoid snapping them, which inadvertently showed me which pipe was loose
    1 round of tightening made it better, fired the engine up and spotted the oil smoking off the exhaust on cylinder 4, tightened that up some more and it's completely fixed
    thank you stu!
     
    Huw, Nov 4, 2023
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  7. bensalf

    bensalf Well-Known Member

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    great, thanks for letting us all know :)
     
    bensalf, Nov 4, 2023
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