Member Since: 25 Dec 2017
Location: Maribor
Posts: 11
Rebuilding a Disco 4 2012
Hi all!
As a new user on the forum, i have a newbie question. 2 weeks ago I bought a 2012 Discovery 4 with 99000 km on the clock with a seized engine. After a strip-down, the bearings on the crankshaft have failed. As a result, 3 conrods have snapped and made 2 holes in the engine block. Basically, the engine is scrap. I decided to get a replacement engine - a 2012 one with low mileage. My question is: should I change the main & conrod bearings (king brand) before mounting the engine as a precaution? What about the oil pump?
Thank you
Alex S.
15th Jan 2018 9:59 am
dgardel
Member Since: 03 Nov 2009
Location: Greater Venice
Posts: 2025
Do you know the cause? Low on oil? Oil pump fail?.....
This document will be a great help for your rebuild project:
Member Since: 25 Dec 2017
Location: Maribor
Posts: 11
Hello!
The cause is definetely oil starvation (look at pic #1 - the color of the crankshaft); I think the main bearing rotation has caused oil starvation to the con rod bearings causing them to overlap destroying the engine.
Buying the replacement engine is definetly a risk that's why I was thinking about changing all the bearings & oil pump in advance.
Thank you for the book provided, it will be of great help!
Alex S.
15th Jan 2018 3:42 pm
geoffsnook
Member Since: 13 Jun 2014
Location: south wales
Posts: 3170
I would change them as the engine is out just for piece of mind but the problem could reappear Discovery 3 se gone
Range rover sport supercharged here:)
15th Jan 2018 3:47 pm
ss9940
Member Since: 25 Dec 2017
Location: Maribor
Posts: 11
Hi!
That's exactly what I thought... There is no guarantee that the problem won't reappear but at least it won't appear soon cause of worn main bearings or failed oil pump...
Any other suggestions? Glueing the main bearings to stay in place?
Alex
15th Jan 2018 3:58 pm
MikeBob
Member Since: 19 Sep 2016
Location: Pretoria
Posts: 115
i suggest you dont replace the bearings, but do replace the oil pump. the post 2012 motors supposedly have bearings with tabs so in theory no more turned bearings
15th Jan 2018 4:20 pm
ss9940
Member Since: 25 Dec 2017
Location: Maribor
Posts: 11
Hello!
Can someone confirm this? The car is 03/2012, that means that the destroyed engine is probably 2011. The bought engine is from 2012. Maybe disassemble and look before installation?
Thanx
Alex S.
15th Jan 2018 5:13 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8225
Can't you drop the sump and check them before your fit the engine?It can when others can't,
It will when others won't,
It goes where others don't.
15th Jan 2018 6:21 pm
ss9940
Member Since: 25 Dec 2017
Location: Maribor
Posts: 11
Sure, I'll do that... Do all the bearings have tabs (main/conrod)?
Alex
15th Jan 2018 6:23 pm
urhunden
Member Since: 15 Jan 2010
Location: Stockholm
Posts: 813
Having a Disco4 3.0l MY2011 and got a MY2015 engine for replacement.
Is it a straight swop or should some of the parts from the MY2011 be put on the later engine. Like injectors, turbo or more?
Any other issues to be anle to make the swop?
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main bearings to stay in place?
