I’ve been at this for 50 yrs
Hard to diagnose from video on my phone but my money is on a lifter or failed cam lobe.
Not discounting a crook drive plate but you should be able to isolate the noise to the bell housing area if that be the case.
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I’ve been at this for 50 yrs
Hard to diagnose from video on my phone but my money is on a lifter or failed cam lobe.
Not discounting a crook drive plate but you should be able to isolate the noise to the bell housing area if that be the case.
That can be a partially collapsed lifter but I am more inclined to say you've done a big end and the piston may even be hitting the head, I am assuming it increases as you rev it up.
All guesswork until you start tearing it down.
Start with just getting the rocker covers off at least for an eyeball of the valvetrain.
I've had an exhaust manifold gasket blow that sounded like that, but not on a Landy. Pulling plugs one at a time is the quickest, easiest diagnosis too. If i'm wrong, you will know in 5 minutes. It's also the least scary option!
Mike
havent made a comment for years. This particular one is a familiar sound, down low, motor drives well, idles fine. Didn't see the cab, but is it an auto? if it is then;
FWIW my money is on the flex plate, Ive had two go in a short period of time, the sound I can liken to the bottom end bearing knock, obvious when sitting in the drivers seat, where it sort of sounds like a hammer being belted on the lowest portion of your motor. But yet no problems with your motor. Ive still got the broken ones in the shed.
No reflection on expertise but I did get two very experienced mechanics look at it when it happened the first time and they both came up with big end knock with possibly a harmonic balancer problem as well( each way bets).
Best of luck.
John
The bit of hose trick worked for me too...that allowed me to diagnose blown exhaust manifold gasket when for all the world it sounded like worn tappet. Anyway the hose to the ear trick would be the cheapest and best way to start closer diagnostics mate. Cheers
Another bit of info that has me thinking its a flex plate , is that the engine for ages had a very slight tick in it ... very slight ...
This louder tick literally started after a fuel stop in the middle of a 800klm run we made on that week end ... The engine was fine , we stopped , turned her off , then restated and bingo , the misses said , what is that noise ? Go figure ..
You guys throwing you time in to give your thoughts are an inspiration and give a bloke hope I can tell you !! I am going to start trouble shooting over the week end and I am still leaning towards the flex plate having ch-it its self :- ) ... not a good thing but better than my mechanic that just wanted to rip the engine out after not even lifting a spanner to her to check anything ... :- (
thanks to everyone :- )
Does definitely sound like a big end gone. If it was cam related you would have a misfire, even if it was slight you would tell.Quote:
Originally Posted by Discodance
If you can narrow it down to one bank or cylinder, take the plug out and wind that cylinder just over tdc and stop turning so the piston is on its downward stroke. See if you can move the piston down in the cylinder through the spark plug hole using some round bar or something, just round the end off so it doesn’t mark the piston crown. If it’s a big end you’ll get a bit of movement and hear the clearance too.
I have owned 8 Land Rover/RR/P76 V8s. They are prone to cam lobe wear if idled in traffic a lot and lifters just sieze sometimes especially if the oil gets a bit thick or dirty.Quote:
Originally Posted by Discodance
Big end noise is normally more of a clonk than a tap and happens twice each crank revolution whereas the cam lobe is operating at half engine speed. Also bigend noise gets louder under load and gets worse a lot quicker than a noisy lifter/ lobe. If it is not a lifter, I would suspect the flex plate. have a listen with a tube on the tourque converter (bell) housing while someone alternates between DRIVE and REVERSE at idle and see if the noise changes.
Good luck for a happy diagnosis.
5380
An A30 you said? You could turn that over like a suitcase to make your life easier.[bigrolf]Quote:
Originally Posted by Chris D
Hey mate, I had a rrs 3.0 tdv6 which spun the mains. I am not familiar with your motor so my info may not be relevant or useful at all. When mine went down hill I was looking everywhere for advice including a local land rover specialist but in the end I had to research and troubleshoot myself. Your noise doesn't sound similar to my spun bearings, from your description of coming on suddenly at a rest stop also doesn't sound like a bearing. Aside from the bearings I actually had a very similar notable metallic ticking noise as you do from my lh bank, it ended up being a stretched cam chain allowing the chain tensioner to over extend causing the loud metallic ticking, may be useless to you though as I'm not sure if your petrol v8 even has ohc. Later on unfortunately i started to hear what sounded like a soft exhaust leak. The specialist agreed and used their gas detectors but no leak. It quickly went down hill and became louder and more of a deep metallic knock, accompanied by noticeable vibration and missing. Lucky for me spun bearings. If yours doesn't get worse with no vibration or oil pressure changes, it might not be your bearings. Unfortunately what I learnt during my short lived delve into LD ownership is I was better off researching, troubleshooting and sorting it myself. Might be nothing but is that a crack heading inwards from the head bolt inboard from what looks like the dip stick tube? Probably not but just looks suspect from that point of view. Hope you get it sorted and its an easy fix. Cheers.