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Thread: engine knocking noise??

  1. #31
    Senior Member Jim_S-V6_2004's Avatar
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    In that case only a Jaguar independent specialist will know about how to set bucket and shim tappet adjustments bud.

    In this case Mikky implies that it's a new loud noise that wasn't there before.

  2. #32
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    I think I'm going to learn a valuable lesson here, I really should of done way more research into these cars.
    I'm debating whether or not to just sell it on as spares or repairs.
    Hate to say that but it's not looking good.
    At least I would have a clearer view of what to look out for and inspect if I looked for another.
    I'm thinking the 3.0 V6 from around 2003 onwards would of been the way to go.
    I'm actually looking at a few online now.
    It's going to be a painful lesson but I can justify spending God knows how much money on something that may or may not ever be right.
    So stuck as to what to do right now.
    It's completely my fault for going in with my heart and not my head but I suppose we have all done it at some point in our lives regarding cars.

  3. #33
    Senior Member Jim_S-V6_2004's Avatar
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    Mikky...

    You actually have a very nice car, well worth keeping if the body is rust-free.

    I was misled because the noise came after the oil change and my mind slipped to the Diesel which has hydraulic tappets.

    My apologies.

    Put your car model in your signature so we can see it in your posts.

    As Engineer reminds us all other S Type engines do indeed have bucket and shim adjustment on their cam followers. This was a special feature of Jaguar engines from the 60s. Rarely is any adjustment needed.

    The only revision I would make is the potential miles you can expect - up to 300k miles is typical from V8s, more if you treat it well and change the oil regularly.

    So...

    Yours does have the bucket and shim adjustment and that is easy to check and set up but needs a mechie who's done it before. They measure the gap with a feeler guage, compare with the tolerance gap, if any adjustment is needed they remove the cam followers (they open the valves) and add or remove shims to/from the correct buckets of the cam followers.

    It won't be so expensive, just labour, but personally I would need to check what is the cause because bucket and shim don't slip.

    So don't despair, hang in and find out from a Jaguar indie what the actual cause is.

    It could be a loose spark plug, the alternator or timing chain or tensioners, or split rubbers on the crankshaft pulley, all straightforward to fix. Even if it's a loose spark plug and gets spat out, it can be helicoiled without removing the cylinder head.

    But get it checked asap.

    Most will diagnose by hearing and not charge.

    It's unlikely the tappets although possible.

    And I doubt that it's catastrophic now.

    Is there a Jag independent specialist near you?

    That is the first place to go for a diagnosis.

    .
    Last edited by Jim_S-V6_2004; 15-03-19 at 11:50.

  4. #34
    Senior Member S-Type Owner's Avatar
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    Gents: Per the factory technical service manual, the two possible causes for the OP's noise are excessive valve clearances or a broken value spring; neither of which is the end of the world if attended to promptly. The engine is indeed a DAMB [Direct Acting Mechanical Bucket[ design similar to the Jaguar designed heads on the V6.
    2003 S-Type 3.0, Zircon with the "Premium Package"...

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  6. #35
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    Quote Originally Posted by S-Type Owner View Post
    Gents: Per the factory technical service manual, the two possible causes for the OP's noise are excessive valve clearances or a broken value spring; neither of which is the end of the world if attended to promptly. The engine is indeed a DAMB [Direct Acting Mechanical Bucket[ design similar to the Jaguar designed heads on the V6.
    do you know roughly what i would be looking at to get those bits done at all?
    thanks.

  7. #36
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    hi jim yes i believe there is a specialist about 20 mins away from me i am going to book it in with them.

  8. #37
    Senior Member S-Type Owner's Avatar
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    Quote Originally Posted by mikky99 View Post
    do you know roughly what i would be looking at to get those bits done at all?
    thanks.
    Once again, I am in the States, so I have no idea what the local cost would be; also, the cost of repairs depends on the scope of the work to be done...
    2003 S-Type 3.0, Zircon with the "Premium Package"...

  9. #38
    Senior Member Jim_S-V6_2004's Avatar
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    Typical hourly Jaguar main dealer labour is £125 +20% VAT.

    Independents vary between £65 and £85 (+20% VAT) per hour.

    Nice Indies charge fewer hours for long jobs.

    All will give you an estimate once they have an idea of the cause, with no obligation to do the work by them.

    .

  10. #39
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    ok brilliant thanks, my brother in law had a listen earlier with a scredriver to the ear and said the noise is definately coming fron the front part of the drivers side bank just in front of where the first coil goes.
    but im going to ring that jag place in the morning and get her booked in.

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  12. #40
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    Very much sounds like the tensioner has let go. And you will need to lift the cam cover to check that. It's really not the end of the world, there are two things that can go wrong, the solenoid that drives the variable cam unit and the tensioner can fail.

    Or, if you are really unlucky the variable cam unit can lost all of it's oil, but you would have had to have murdered a flock of Robins to be that badly afflicted. Only ever seen that once, on a 3 litre unit. That had run out of oil completely...

    What Jom said about over filling with not being able to do any damage is correct up to a point, but there are stories out there about people filling engines to the filler cap brim, not knowing any better.. That will definitely do damage as there's this minor thing where you cannot compress oil...
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