Scerion666
Active Member
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biketeacherdave
Well-Known Member
Am.i missing something here ??? You have all ready bought a 4 year old car and your asking what you should check before using it ???.
That is something you should have done before buying it as a 4 year old D4 aint cheap.
That is something you should have done before buying it as a 4 year old D4 aint cheap.
Scerion666
Active Member
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Scerion666
Active Member
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johnlad
Well-Known Member
Be aware the engine likes to self destruct, snapping its crank for no apparent reason.
biketeacherdave
Well-Known Member
^^^^^^^^ what he said^^^^^^^
Tbh my 135k D3 doesnt use a drop between 5k oil changes.
There was a bulletin somewhere ref turbo oil return pipes holding oil and making the car smoke.
I still reckon theres a back story to the crank failures ie it been overheated sometime in the past, wrong oil used, run low on oil or something else along the same lines.
There was a recent discussion on the D3/4 forum ref tuning the D4 and people saying its great etc etc, until I dropped in about shortening the cranks life and just like that the conversation stopped dead
I still reckon theres a back story to the crank failures ie it been overheated sometime in the past, wrong oil used, run low on oil or something else along the same lines.
There was a recent discussion on the D3/4 forum ref tuning the D4 and people saying its great etc etc, until I dropped in about shortening the cranks life and just like that the conversation stopped dead
Hi
You’ve got a very good point there ref tuning and indeed the engines being chipped as see thread after thread where it’s been done
Can’t get my head round why if all cranks are manufactured from the same company with the same materials of why some fail and some don’t, doesn’t make sense, could it be the remaps thats causing the issues or as u say ref the oil
Are some using cheap oil etc
Maybe it could be that defining eureka moment to find out what’s causing them to fail
Even though I had only cover a few hundred miles in between mots I still had mine serviced, I bought everything , millers 5/30 and genuine oil filter , mahle fuel filter, ravenol front and rear diff and ravenol transfer box oil
Don’t know why but engine sounds even quieter , more than likely I’m imagining it but does seem smoother
Also same as urs mine doesn’t burn any oil
johnlad
Well-Known Member
I have wondered myself with D3/D4 how many of the failures were running a remap or other tuning.I still reckon theres a back story to the crank failures ie it been overheated sometime in the past, wrong oil used, run low on oil or something else along the same lines.
There was a recent discussion on the D3/4 forum ref tuning the D4 and people saying its great etc etc, until I dropped in about shortening the cranks life and just like that the conversation stopped dead
Although you would expect a manufacturer to over engineer a critical part like a crank.
johnlad
Well-Known Member
Can’t see it being oil quality as a lot of failures are on LR main agent serviced vehicles
I read a post that the oil spec of the engine when used in ford vehicle is 5W40 compared to LR 5W30, apparently the ford vehicles have a lot less crank failures.
Possibly thicker oil supporting the shell bearings better?
Thanks John I think I will try some 5/40 next change and see how it goes.
Maybe the main dealer serviced motors are maxed out on their miles for the oil change or more likely over their miles?
That’s interesting as I also see ref to the ford territory
Funny as I’ve just had my engine oil done and bought the millers
Did u ever see this report ref where someone had there’s tested after an engine failure
https://www.disco3.co.uk/gallery/albums/userpics/23856/D4_russian_doc.pdf
Recently had a service and bought this one for my engine , does seem quieter but thinks that’s just me
https://www.opieoils.co.uk/showproduct.aspx?VariantID=98953&SEName=millers-oils-nanodrive-ee-longlife-eco-5w-30-synthetic-engine-oil&vehicleid=916&yearfilter=2005&providerpartid=98953&genericpartid=1862&providerpartlinkid=25703&partsgroupid=2354&genericpartname=Car engine oil
Land Rover Discovery MK III [SUV] 2.7 TD 4x4 - Fitment/Product Details:
A fully synthetic high performance, low friction, fuel efficient engine oil. Part of the Millers Oils NANODRIVE Low Friction Technology range. Formulated to meet the demanding requirements of today's engines with the added benefits of reduced friction, improved fuel economy and a reduction in overall running costs.
johnlad
Well-Known Member
Just looked through that failure report, the conclusion they arrived at
was the crank is to small/short for the engine size/ output,
I wonder LR have seen the report
Think there was a court case over it , alas though haven’t seen any reports of the conclusion
Scerion666
Active Member
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Nodge68
Well-Known Member
From the broken engines I've seen, there's a problem with them. From what I saw, there was evidence of the main bearing rotating in the cap. This then starved the crank pin of oil, leading to overheating and crank failure.
5w30 is too light for any engine, this gives rise to bearing/ crank contact and wear. Eventually the bearings are so worn, that it's a rattling fit in the bearings, which will also lead to crank failure.
Swapping to 5w40 will improve journal to bearing support, and increase engine life, as well as making the engine sound quiet.
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Nodge68
Well-Known Member
There's lots of different ideas as to why the crank fails, from incorrectly hardened cranks, to crank being dropped in transit. From my own brief investigation on this, all the engines I've seen with this issue, all have had evidence of main bearing rotation in the cap.
I believe that if the crank is going to fail, it will do so before 100K miles. So in theory, if it gets to 100K unscathed, then it'll be good until the pistons fail at ~400K miles.
From the broken engines I've seen, there's a problem with them. From what I saw, there was evidence of the main bearing rotating in the cap. This then starved the crank pin of oil, leading to overheating and crank failure.
5w30 is too light for any engine, this gives rise to bearing/ crank contact and wear. Eventually the bearings are so worn, that it's a rattling fit in the bearings, which will also lead to crank failure.
Swapping to 5w40 will improve journal to bearing support, and increase engine life, as well as making the engine sound quiet.
There appears to be a trend noted in South Africa ;
http://www.disco3.co.uk/forum/conrods-pistons-tdv6-82615.html
