Member Since: 02 Jul 2020
Location: Stawell
Posts: 18
disco 4 engine
hello everyone i have a discovery4 3.0 that has broken a crank, its damaged some of the big end bearings
so what i want to know is can i just replace the crank and the bearings or are there are other things i should be checking. Any help would be appreciated. Thanks
27th Jun 2021 1:05 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 5052
Block is scrap unfortunately.
The energy released warps the block causing misalignment which cannot be reversed.
You're best option is either a new block from LR, or a donor from a write off if you can find one.yµ (idµ - eAµ) ψ=mψ
27th Jun 2021 3:12 pm
aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2463
Even if the block isnt twisted the engine is line bored fitting caps from another engine wont match.Andrew
D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE
27th Jun 2021 4:34 pm
galwaygreen
Member Since: 30 Oct 2011
Location: plymouth
Posts: 6525
whats the age/mileage ?
27th Jun 2021 10:48 pm
donny d
Member Since: 02 Jul 2020
Location: Stawell
Posts: 18
2011 270.000 kms
28th Jun 2021 12:17 am
donny d
Member Since: 02 Jul 2020
Location: Stawell
Posts: 18
so in essence what you are saying is once the the crank breaks, that's it throw the engine away?
28th Jun 2021 12:16 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 5052
The block yes, pretty much.
If you did decide to repair it LR will not sell you a crank, con rods, bearings etc, So you will have to use aftermarket components. Then after all that there is the question of how long it will last if it runs properly at all.
You could try a PM to Oval Auto's, or to Disco Mikey and seek their opinions. Both are acknowledged authorities on that engine with more experience than me, but my opinion is only what I have experienced myself.
It's a dreadful position to find yourself in, but best of luck whatever route you choose. yµ (idµ - eAµ) ψ=mψ
28th Jun 2021 12:27 pm
aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2463
Unfortunately yes especially as in your case the caps are damaged.
I have not seen one yet that was repairable after a snapped crank.Andrew
D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE
28th Jun 2021 12:27 pm
Breg90
Member Since: 04 Feb 2017
Location: Falkirk
Posts: 360
You say it has damaged big end bearings- shells only or has it damaged the bores in the block and caps? If the latter it’s total scrap. If just the shells it ‘may’ be recoverable, but I doubt in a commercial manner, ie it would need to be a diy job to assess. Key issue is alignment of the main bearing bores - main bearing total clearance is 0.002 to 0.004 mm - the slightest distortion between the bearings will mean the crank will not turn - block scrap. So I’d suggest you need the block trueness checked with a coordinate measuring machine (CMM). £££££.
Then you will need a crank - three options I can see:
1/. Buy a Chinese crank off eBay - bad idea!
2/. Buy one of the ‘genuine’ cranks off eBay - provenance????
3/. Buy a crank for a Ford F-150 king ranch 2020 model. This has a version of the lion 3.0 engine. Having spent a bit of time looking at this engine I suspect it’s the same crank. But who knows. You can find the crank listed for $585 on Ford parts suppliers in the states.
Then you need bearings (main and big end). Ford (engine manufacturer) have 3 grades (thicknesses) of bearings for each location. Apparently from reading the codes on the block and crank you can determine what should be fitted…. I can’t de-code this after much effort. So you will need to order one of each size. Trial fit in each location to determine what is needed, then do a final order to get the full compliment of bearings. I’ve only found the bearings for sale in the USA.
Don’t think it’s worth the grief if the cranks gone in my view.Series one 1949 - in bits, chassis is strapped to the ceiling in my garage (beside the canoe)
LR 90 - In bits
Disco 3 - currently in bits
28th Jun 2021 5:20 pm
galwaygreen
Member Since: 30 Oct 2011
Location: plymouth
Posts: 6525
short block from LR think its £6500///plus labour to reconstruct
Is OP in Oz? Does that shift options more towards getting a Ford F150 engine?.
Dean
====================================
2011 D4 XS - OBD port protection, RLD spare wheel protector, All LED interiors lights, Timed Climate enabled, iiD tool paired.
2011 D4 Landmark - Stolen from same dealer before I paid for it
2011 D4 GS - Stolen whilst at dealer ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms
29th Jun 2021 6:00 am
Breg90
Member Since: 04 Feb 2017
Location: Falkirk
Posts: 360
Try these:
The big question is will they fit a disco 4?
AdrianSeries one 1949 - in bits, chassis is strapped to the ceiling in my garage (beside the canoe)
LR 90 - In bits
Disco 3 - currently in bits
29th Jun 2021 11:04 am
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 5052
It would be a great experiment if you were to take the plunge there Adrian.
A TDV6 owners "Go fund me" perhaps yµ (idµ - eAµ) ψ=mψ
29th Jun 2021 11:41 am
Breg90
Member Since: 04 Feb 2017
Location: Falkirk
Posts: 360
Think the pistons are different as the us version has a compression ratio of 16.5?:1, d5 twin turbo is 17.5?:1Series one 1949 - in bits, chassis is strapped to the ceiling in my garage (beside the canoe)
LR 90 - In bits
Disco 3 - currently in bits
Last edited by Breg90 on 29th Jun 2021 12:11 pm. Edited 1 time in total
29th Jun 2021 11:56 am
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 5052
Is the block casting identical, or do you know?
If it was, I think most peeps could live with 16.5 cr so long as the FI system was happy with it too!yµ (idµ - eAµ) ψ=mψ
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