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Thread: Noisy 3.5

  1. 20th July 2014, 12:46 PM #1
    xstriple
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    Noisy 3.5

    Ok, so Ive been chasing this noise around my engine for months, throwing time/money at it to no avail.
    New cam/bearings/(now) lifters/rockers and shafts.
    Still there.
    Is there any chance worn injectors could be the culprit? It runs lpg, quite well and the cam is one above standard so timing has been an issue. When it runs on petrol the noise is more pronounced and it is a little rough.
    Cold startup sounds fine then say, 3 minutes in it starts tap/rattling.
    Any help would be appreciated,,,, before it becomes a parts pig or garden ornament.
    Cheers.
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  2. 20th July 2014, 12:56 PM #2
    PhilipA
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    On some 3.5s and 3.9s the cam moves backwards and forwards and knocks against the timing case, as they are only held by the timing chain and the slope on the lobes.
    Injectors make a bit of noise but you should be able to isolate the noise with a stethoscope if it is injectors.
    Could be a loose sleeve. Oh the horror.
    Regards Philip A
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  3. 20th July 2014, 01:02 PM #3
    xstriple
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    Maybe I should ask be asking Bee but do you know if, when running on gas, the injectors shut down or the fuel just gets stopped?
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  4. 20th July 2014, 02:16 PM #4
    PhilipA
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    Usually turned off or you would have 2 lots of fuel.
    That is why they say to run on petrol every week.
    I sold a set of 14CUX injectors to a bloke in melbourne where all his injectors were seized, you could see it in the photos. This was from not exercising the injectors .
    Regard sPhilip A
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  5. 20th July 2014, 02:29 PM #5
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    bee utey
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    The trouble with internet diagnoses is that they're one dimensional. You, the owner, have to move around the engine, tilt your head, crawl under, use a stethoscope (bit of heater hose) to identify the area of origin of a noise. You can use a timing light as a guide to speed, a noise that is in synch with the light is likely cam/timing/lifter related, a noise that happens twice as often is likely the crankshaft. Noises related to cylinders firing can be identified better by shorting out each spark plug in turn.
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  6. 20th July 2014, 09:08 PM #6
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    djam1
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    Slipped liner?
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  7. 22nd July 2014, 04:28 PM #7
    xstriple
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    Where would I find evidence of liner slippage?
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  8. 24th July 2014, 04:08 PM #8
    xstriple
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    Wouldn't there be water in the oil or oil in the water?
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  9. 24th July 2014, 08:03 PM #9
    PhilipA
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    Slipped liners are pretty unusual in 3.5s . they are a 3.9, 4.0 and 4.6 specialty.
    Regards Philip A
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  10. 24th July 2014, 08:35 PM #10
    gazby
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    Smile It happens.

    Lots of years ago I had a slipped liner in a '77 Range Rover classic, and my mate had a slipped liner in his '86 Range Rover Vogue, both stock 3.5 V8's.
    And the engine machine shop that did our repairs said that the Rover V8 engines at that time were a regular fix for them.
    Unusual though it may be, it can happen to any alloy block with shrunk in liners that have no more positive means of lateral location in standard form, it would have helped if Rover would have pressed or dropped the liners all the way down to the bore shoulder at the bottom of the block, then decked off the liners flush with the block deck, this would have removed any potential scope for movement or slippage.
    And no you will not get coolant in the oil or vice versa, the engine is not a "wet sleeve" type but dry sleeve in alloy block, the movement just makes a racket, like a little cobbler hammering tacks, as the sleeve moves up and down.
    To fix properly you need a counterbored block deck and shouldered sleeves, some expensive/extensive machine shop work. Gaz
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