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Great forum thread on snapped cranks
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NC500
 


Member Since: 18 Sep 2017
Location: On the NC500
Posts: 495

Scotland 2014 Discovery 4 3.0 SDV6 HSE Auto Firenze RedDiscovery 4
Great forum thread on snapped cranks

I stumbled upon this thread in a South African forum. It may already have been shared but it was the first time I’d seen it. It is excellent, if a little long!

Some sensible maintenance tips too. Anyone know how much replacing the oil pump and front harmonic balancer adds to a cambelt replacement service?

https://www.4x4community.co.za/forum/showt...k-Failures
  
Post #207973031st Aug 2019 7:10 am
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NJSS
 


Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10464

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Waitomo GreyDiscovery 4

Quote:
1. Do a proper FULL auto gearbox flush ideally every 60’000 to 80’000km. NB: We are talking here about a full flush with a proprietary autobox flushing machine (see attached pic). This will prevent TC shudder.
Check also here: http://www.4x4community.co.za/forum/...te=1&p=3188785

2. Have the front balancer checked for running true at 100’000km intervals or whenever changing the Poly-V belt. If any - even slight wobbling is observed, replace immediately.

3. Replace the oil pump at each cambelt change, this will go a long way to prevent bearing rotation.

4. If there is any misfire on the engine, get injectors checked and if one or more are faulty, replace them as a set. Do not fiddle with replacing individual injectors. This could contribute to engine vibrations.

Quote:

The major criteria is to change the oil pump at each cambelt service to ensure maximum oil delivery and pressure.

The best prevention against the turned bearings issue is 10'000km oil change intervals


I have to say that I entirely agree with the above & have replaced the oil pump when changing belts, and also change oil & filter mid-way between JLR services.
 Am I Gammon or Woke ? - I neither know nor care.

2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
none Electric or H2 fuel cell - yet.
There are 10 types of people in this world: Those who understand binary, and those who don’t. 
 
Post #207973331st Aug 2019 7:25 am
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knwatkins
 


Member Since: 19 Sep 2018
Location: Poole, Dorset
Posts: 716

United Kingdom 

I agree with the above also. Although, on point 4, waiting until a misfire may be too late! Injector spray pattern, timing, fuel quantity etc. could all contribute to imbalance and increase the risk of bearing rotation.

I'm planning on removing my injectors and getting them tested on a periodic basis. Any that are out of spec will be replaced.

On this subject, does anyone know a good test house for injectors?
 Kev

MY2014 L405 RR Vogue SE 4.4 SDV8 in Corris Grey
MY2010 L320 RRS HSE 3.0 TDV6 in Stornoway Grey 
 
Post #207975431st Aug 2019 8:55 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10337

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

What is this balancer. The belt drive wheel?
  
Post #207979831st Aug 2019 10:57 am
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robpenrose
 


Member Since: 12 Jan 2016
Location: Surrey / SW London
Posts: 2136

United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Stornoway GreyDiscovery 4

But there seems to be no guide on when these engines let go. Some are pampered, have everything done + extra and they let go at an early age. Some thrashed, not serviced properly and they see 200k miles without issue.

There just doesn’t seem to be any way to predict the issue or prevent it. Some of the ideas can’t hurt I guess, but it’s possibly just all extra money that makes no difference.
 

Current: D4 HSE
Previous: BMW Z4M Coupe
Previous: Land Rover Defender 90 CSW Td5
Previous: Land Rover Discovery Td5 ES 
 
Post #207980331st Aug 2019 11:33 am
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Hi

Hope this finds everyone well

May i ask a daft question please , could remapping ever have an effect on the engines plse

Has there ever been a percentage failure survey in relation between a mapped and non mapped engines


Also posted this report a while back that some guy had done if anyone may be interested


https://www.disco3.co.uk/gallery/albums/us...an_doc.pdf

Many thks Bow down
   
Post #207980431st Aug 2019 11:40 am
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Mr Kington
 


Member Since: 12 Dec 2011
Location: Scottish Borders
Posts: 1549

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Siberian SilverDiscovery 3

What I don’t get is why should the owners have to go to all this trouble with a known manufactured fault. It’s crazy and unfair. JLR should grow some balls and take ownership of any product where the crank goes. If they did, then I wouldn’t have just made the decision to buy something else.
 James favourite hobby is writing in the third person.  
Post #207980631st Aug 2019 11:49 am
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Peakwayfarer
 


Member Since: 25 Apr 2016
Location: Uk
Posts: 434

England 

Totally agree, if it's been properly serviced and maintained, a 3 litre diesel engine should be good for at least 500k miles.

Similar to you but fortunately I had my engine replaced by LR under manufacturers warranty. I then very quickly part exchanged and I now drive something else.
  
Post #207981031st Aug 2019 12:00 pm
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adam
 


Member Since: 20 Sep 2005
Location: Home and Happy
Posts: 6917

United Kingdom 
Re: Great forum thread on snapped cranks

NC500 wrote:
I stumbled upon this thread in a South African forum. It may already have been shared but it was the first time I’d seen it. It is excellent, if a little long!

Some sensible maintenance tips too. Anyone know how much replacing the oil pump and front harmonic balancer adds to a cambelt replacement service?

https://www.4x4community.co.za/forum/showt...k-Failures


The article author used to be on this site pretty regularly a few years ago
 Now Golf GTI PP, 7 speed DSG.
Ex D3 and D4 
 
Post #207981231st Aug 2019 12:16 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Also saw this on the Citroen web site

http://c6owners.org/plugins/forum/forum_viewtopic.php?31162.0

Some extracts from there forum



In both cases the automatic gearbox was in "Sport" modus and thus revving to its maximum in each gear. Therefore, one of the causes that I imagine, would be a failure of the revsensors or revlimiters of the engin or of the automatic gearbox



Remember the Jaguar & Land Rover installation is quite different;
- JLR use over-fueling to clean the DPF, which can lead to the engine oil getting contaminated with fuel & lack of proper lubrication.
- PSA use Eolys fluid
- Transverse mounting in PSA (front wheel drive) vs Longitudinal mounting in JLR (rear wheel drive or 4x4 with different gearbox).
   
Post #207981431st Aug 2019 12:26 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

Pete K wrote:
What is this balancer. The belt drive wheel?


Front crank pulley aka the the belt drive wheel Thumbs Up
Lots of other car maker shave problems with these coing apart, most recent one Ive heard of was BMW but know the MercsAudis used to do it as well, in their cases if you could see any rubbber bulging out then it was time to change asap.
  
Post #207984231st Aug 2019 4:01 pm
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rrhool
 


Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4398

United Kingdom 2007 Discovery 3 TDV6 SE Manual Zermatt SilverDiscovery 3

Pete K wrote:
What is this balancer. The belt drive wheel?


https://www.disco3.co.uk/forum/can-cranksh...p;start=30

rrhool wrote:
It's more likely that the problem is with the TV damper. The TV (torsional vibration) damper may not have been specified correctly, it may not have been manufactured correctly. There may be rogue failures in manufacture of the TV damper, that you can't see, which will lead to a crank failure.

I know a chap who was involved in the durability testing of the Lion engine, next time I see him I'll ask his opinion.

I'm not sure that changing the TV damper will protect you from a failure. You might be unlucky enough to fit a failed TVD, where the one you had was ok.

This is just my assumptions based on some engine knowledge, not facts. Thumbs Up


I floated this idea a couple of years ago, but didn't get any response. Thought I was barking up the wrong tree, but maybe not? Neutral
 Richard


D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.



Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone 
 
Post #207985631st Aug 2019 6:25 pm
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NC500
 


Member Since: 18 Sep 2017
Location: On the NC500
Posts: 495

Scotland 2014 Discovery 4 3.0 SDV6 HSE Auto Firenze RedDiscovery 4

As I said, if the cost is not unreasonable I would consider changing the oil pump and damper at the next service (belts). I will ask Disco Mike’s opinion and for a quotation!!
  
Post #207985731st Aug 2019 6:47 pm
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