![]() | Home > Maintenance & Mods (L405) > SDV6 preemptive crank and bearing change? |
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D3Jon Member Since: 15 Aug 2020 Location: Lincolnshire Posts: 502 ![]() ![]() |
I honestly don't think that'd be required. It might even introduce a problem that wasn't there to start with! |
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D3Jon Member Since: 15 Aug 2020 Location: Lincolnshire Posts: 502 ![]() ![]() |
Oil dilution... forgot to mention that. Make sure this vehicle hasn't been doing lot and lots of short runs! You don't want a Chelsea Nannies car that's been sat in traffic for hundreds of hours, clogging the DPF and having multiple failed DPF regens, leading to more diesel than oil in the sump.
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Danwilderspin Member Since: 15 Jun 2016 Location: Cambridgeshire Posts: 2223 ![]() ![]() ![]() |
Good advise - tbh there seem to be more and more sdv8 failures as they get older and as you say the sdv6 and tdv6 sold many more units - the failure rate seems abut the same if you talk percentages Current stable:
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Gremlin500 Member Since: 11 Mar 2022 Location: Newcastle, UK Posts: 1635 ![]() ![]() ![]() |
Just to add a bit of balance, oil dilution can be a bit of a red herring, and often mentioned by unqualified “armchair experts”, almost like we are all potentially driving round with 50/50 oil/diesel mix in our engines, -nothing could be further from the truth, and therefore I suspect has nothing to do with snapped cranks whatsoever, given the vehicle is serviced sympathetically:
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GraemeS Member Since: 06 Mar 2015 Location: Wagga area Posts: 2604 ![]() ![]() |
I have some personal experience after my sons 3.0 D4 had a main bearing failure that lead to the seizing of a big-end bearing, then replacing the bearings of a running engine that had travelled 120K kms with trimetal bearings to get rid of the original sputter bearings prior to fitting. Sputter bearings are OK where conditions are perfect but they don't provide the leeway that good trimetal bearings do in less than perfect conditions. The D4 was mine from new for a number of years, it doesn't have a DPF and oil changes have always been very frequent.
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Kot Member Since: 10 Mar 2021 Location: broadland Posts: 1293 ![]() ![]() |
Get a Petrol |
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D3Jon Member Since: 15 Aug 2020 Location: Lincolnshire Posts: 502 ![]() ![]() |
Hmm, that comment sounds firmly at me.... given I'm the only person to have mentioned oil dilution within this thread. I'm hardly unqualified, nor an armchair expert. I have almost five decades of experience working on cars and race cars, and numerous qualifications in engineering & motor vehicle technology. Additionally, my reference to more diesel than oil in the sump, was obviously a quip. Perhaps I should have added a smiley face for clarity. 1992 RR Classic 3.9 efi Vogue 2014 Disco 4 HSE =================== Both my fatties now gone... Previous: 2011 L322 4.4 TDV8 Vogue SE /// 2002 L322 4.4 V8 HSE /// 2009 Discovery 3 2.7 TDV6 XS /// 2004 Defender 90 TD5 /// 1993 110 V8 Snatch Landrover /// 2005 Discovery 3 2.7 TDV6 SE (Aus) /// 1990 110 Isuzu 3.9 County (Aus) /// 1976 Series III Trayback (Aus) |
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Gremlin500 Member Since: 11 Mar 2022 Location: Newcastle, UK Posts: 1635 ![]() ![]() ![]() |
Hi Jon, sorry but my intentions were purely general, nothing personal at all, just to say oil dilution is an oft-exaggerated cause at times. Oil pressure hardly ever gets mentioned, for example. Given frequent oil/filter changes, it’s a very good idea to fit a new oil pump each time the belt service is done every 5/6 years or 50K miles with these engines. It’s more likely a result of several combining factors which ends in any one catastrophic failure, rather than a single cause, IMHO. “If it ain’t broke, don’t fix it” -where’s the fun in that? |
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D3Jon Member Since: 15 Aug 2020 Location: Lincolnshire Posts: 502 ![]() ![]() |
OK, thanks Gremlin. |
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Danwilderspin Member Since: 15 Jun 2016 Location: Cambridgeshire Posts: 2223 ![]() ![]() ![]() |
You mention main bearings - what about big end bearings? Current stable: 2006 BMW M6 2007 4.2 V8 S/C FF Gone: 2002 4.4 V8 FF |
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GraemeS Member Since: 06 Mar 2015 Location: Wagga area Posts: 2604 ![]() ![]() |
The big-end bearings in the replacement engine didn't show any abnormal wear but were replaced anyway with trimetal bearings. |
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Gremlin500 Member Since: 11 Mar 2022 Location: Newcastle, UK Posts: 1635 ![]() ![]() ![]() |
Some nice lively discussion here, folks!
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GraemeS Member Since: 06 Mar 2015 Location: Wagga area Posts: 2604 ![]() ![]() |
Sputter bearings don't have a wear layer as such and therefore never show in oil analysis until the sputter coating has failed leaving the soft aluminium/tin layer as the bearing material which is very quickly destroyed as it isn't a wear layer. Hence there won't be any indication of a pending bearing failure until the bearing is severely compromised. The idea of replacing the sputter bearings with trimetal bearings is to prevent the sudden demise of a bearing.
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Philip Member Since: 05 Jan 2010 Location: UK Posts: 2607 ![]() ![]() |
Has anyone had the Ranger/Amarok version apart yet? |
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