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Tagged main bearings
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OvalAutos
 


Member Since: 28 Dec 2018
Location: Cradley Heath
Posts: 382

United Kingdom 
Tagged main bearings

Don't be fooled into thinking that a tagged bearing shell won't spin; they still do Sad




Two main caps. One with a tag cutout and the other a standard no tag.
 Joe  
Post #201884615th Jan 2019 4:40 pm
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galwaygreen
 


Member Since: 30 Oct 2011
Location: plymouth
Posts: 6525

United Kingdom 2016 Discovery 4 3.0 TDV6 Graphite LE Auto Loire BlueDiscovery 4

any more info
  
Post #201887415th Jan 2019 6:07 pm
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lynalldiscovery
 


Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274

United Kingdom 2006 Discovery 3 TDV6 Metropolis LE Auto Bonatti GreyDiscovery 3

Why did they spin? theres always a why.
  
Post #201892415th Jan 2019 9:03 pm
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Hardware
 


Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 12676

United Kingdom 2011 Discovery 4 3.0 SDV6 XS Auto Sumatra BlackDiscovery 4

well … the physics of it is that they spin when the friction between the moving bits and the bearing is greater than the forces keeping the bearing in place. usual suspect for this would be oil starvation.

But the interesting thing, from Ovalautos various posts is that even tabbed ones move. Notice it's "move" he uses and not "spin".

Is the implication they move sideways ? or is he saying they rotate a bit rather than spin freely ? (which might be how some would interpret "spin" )

I was also surprised to learn that in some racing engines, they are screwed in place !! I though that would not work as the screw would expand and score the crank … but would that matter ? the scored section would simply hold more oil, would it not ?
 .


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 Sad ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms 
 
Post #201893615th Jan 2019 10:17 pm
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MrBrain
 


Member Since: 12 Mar 2014
Location: bucks
Posts: 471

United Kingdom 2006 Discovery 3 4.4 V8 HSE Auto Tangiers OrangeDiscovery 3

Has anybody considered an additional electric oil pump? So that pressure is up before the engine starts? I get a vague feeling that the issue is too many short cold journeys.
  
Post #201894215th Jan 2019 10:30 pm
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Andy500
 


Member Since: 27 Aug 2018
Location: Cheshire
Posts: 228

United Kingdom 2009 Discovery 4 3.0 TDV6 GS Auto Stornoway GreyDiscovery 4

I was pondering about this the other day following Ovalautos post re the number they will see in a year. Does anybody know if there is anything common about the operating conditions that the engine has been/is under when the failure occurs I.e is it always when the engine is cold that it lets go or does it typically happen well in to a journey when the engine and fluids are all well at operating temps?
Just be interesting to know the conditions when failure occurred to see if there is any common theme?
  
Post #201894315th Jan 2019 10:34 pm
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MrBrain
 


Member Since: 12 Mar 2014
Location: bucks
Posts: 471

United Kingdom 2006 Discovery 3 4.4 V8 HSE Auto Tangiers OrangeDiscovery 3

I know of two that occurred. Both on start-up. But I bet its not that clear really.
  
Post #201894715th Jan 2019 10:41 pm
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Andy500
 


Member Since: 27 Aug 2018
Location: Cheshire
Posts: 228

United Kingdom 2009 Discovery 4 3.0 TDV6 GS Auto Stornoway GreyDiscovery 4

Do you know if they had both been stood for a while or was it like day 1 ok next day kaput!
  
Post #201894915th Jan 2019 10:46 pm
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MrBrain
 


Member Since: 12 Mar 2014
Location: bucks
Posts: 471

United Kingdom 2006 Discovery 3 4.4 V8 HSE Auto Tangiers OrangeDiscovery 3

Both on restarts during a normal day's use.
  
Post #201895415th Jan 2019 11:08 pm
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72740

Ukraine 

Mine packed up when engine was warm and had been driven a couple of hundred miles tootling around N Lofotens (sp?) that day. When it’s quitting time they just quit.
   
Post #201895515th Jan 2019 11:21 pm
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MrBrain
 


Member Since: 12 Mar 2014
Location: bucks
Posts: 471

United Kingdom 2006 Discovery 3 4.4 V8 HSE Auto Tangiers OrangeDiscovery 3

So you were driving and suddenly bang bang clatter?
  
Post #201895715th Jan 2019 11:25 pm
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Hardware
 


Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 12676

United Kingdom 2011 Discovery 4 3.0 SDV6 XS Auto Sumatra BlackDiscovery 4

Del,

one of the oddities of your case was that we don't actually know what failed … it was just it happened in a scenario that made it not financially viable to ever find out.

might have been a large twig caught in the serpentine belt for all you kow ! Rolling with laughter


( I say that because there was once a famous story of exactly that happening with a Rolls-Royce ... ended up being "taxied" to Cornwall (IIRC ) because the AA/RAC man was too frightened to risk damaging an expensive car he had no knowledge of that he had the car/owner taken home … owner was quoted as being delighted the problem wasn't serious in the end AND he'd saved a fortune on fuel ).
 .


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 Sad ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms 
 
Post #201895915th Jan 2019 11:31 pm
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72740

Ukraine 

You implying I was beating the car Fawlty Towers style? Whistle

   
Post #201896115th Jan 2019 11:34 pm
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Hardware
 


Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 12676

United Kingdom 2011 Discovery 4 3.0 SDV6 XS Auto Sumatra BlackDiscovery 4

Have you noticed SWMBO is on holiday with you? Can't carry on like on your normal roadtrips you know! Laughing
 .


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 Sad ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms 
 
Post #201896315th Jan 2019 11:46 pm
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72740

Ukraine 

Tell me about it. Big Cry Big Cry Big Cry

And I am so dead if she reads this! Shocked
   
Post #201896615th Jan 2019 11:52 pm
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