Tdv6 vs sdv6

[Lukeis]

Does anyone know the difference in these two engines and can explain it to a layman like myself?

the sdv6 appeals to me because it has 700nm instead of the 600nm the tdv6 but what concerns me is have they stretched the same engine to get that extra power and therefore is that possibly going to make it less reliable?

i clearly have no idea of the inner workings to this stuff so feel free to correct my logic

[101RRS]

My understanding is that in the Disco 5, they are the same engine just at a different level of tune.

[chuck]

The update 225kw 700nm is twin turboed.

[101RRS]

And so is the lower powered version.

It is only the US Ford Duramax version that is single turbo.

Garry

[IndusD4]

And so is the lower powered version.

The workshop manual disagrees - I have a TD6 and enough space under the bonnet to fit an air compressor where the SD6 has a second air intake box. I thought that was for the second turbo.
This is from the 2018 TD6 workshop manual:

164392

Ron

[101RRS]

The workshop manual disagrees - I have a TD6 and enough space under the bonnet to fit an air compressor where the SD6 has a second air intake box. I thought that was for the second turbo.
This is from the 2018 TD6 workshop manual:

164392

Ron

I certainly agree that is pretty persuasive but if you actually google Discovery 5 TDV6 it always comes up as the earlier TD6 (190kw/600nm) sequential turbo engine. If you google Discovery 5 SDV6 it always come up the later TD6 (225kw/700nm) sequential turbo engine.

Other than the US Ford Powerstroke engine, I dont see any reference to a single turbo in the 3.0 V6 diesel engines.

Though not authoritative wiki has both LR SD6 engines as sequential turbos. Ford AJD-V6/PSA DT17 - Wikipedia (https://en.wikipedia.org/wiki/Ford_AJD-V6/PSA_DT17#3.0D/TDV6/SDV6)

However what is clear is that the engines were not generally fitted to the D5 at the same time - it would seem the 190kw V6 engine was fitted to the D5 in the first years and now it has the 225kw engine is fitted to later models - not sure if there was much of a cross over period.

Garry

[IndusD4]

Hi Garry

I've always thought the 'S' in SDx was for sequential, therefore a SDV6/SD4 would be a twin turbo and a TD6/TD4 (or even TDV6 in a D4) a single turbo. At least in Australia / Europe. As for google, it is hard sometimes to find the answer which may be due market differences in these vehicles.

Ron

[101RRS]

Yes I agree but what confused matters was back with the D4 - in early D4s the TDV6 was the 2.7 (single turbo) and the SDV6 was the 3.0 sequential twin turbo. But when the 2.7 was dropped the TDV6 badge went to the low power 3.0 sequential twin turbo (155kw?) and the SDV6 stayed with the high power (180kw) diesel - hence the start of the confusion.

Now to the D5 - despite google no clarifying the issue I agree the earlier 3.0 TD6 (190kw) was single turbo. While some people may us the terms TDV6 and SDV6 with respect to the D5 - the correct term is TD6 or DTV6 (very early on) or SD6 currently (more confusion). So the TD6 can refer to the single turbo engine early on or the sequential turbo later on or the later can also be a SD6 [bighmmm].

So the OPs original question - forget TDV6 or SDV6 or TD6 or DTv6 or SD6.

The single turbo 3.0 diesel was fitted to D5s up to about late 18 early 19 (not sure of the change). This was the engine that had the oil dilution problem and can break crankshafts - is lower power and torque as you have noted.

The later twin turbo 3.0 diesel has 225kw of power and 700nm of torque - does it too break crankshafts - no idea. The US Powerstroke Engine has been out for about 2 years and has a different crank and bearings - no idea if this fixed the crank breaking issue or whether this crank has been put into the newer Land rover engines.

It seems (and I am not sure) you cannot pick and choose which 3.0 diesel you wanted in your D5 - it came with whatever year model you bought.

The confusing, and constantly changing engine naming process makes things as clear as mud - starting back with the D4.

This is doing my head in [bigsad]

[IndusD4]

Agreed, LR muddied the waters with the D4 TDV6 2012 onwards.

As for the original question, in the D5 the td6 is a single turbo 190kw/600nm engine and the sdv6 is a twin turbo 225kw/700nm engine.
Also true, you can indeed not pick your engine output other than by selecting a later model year (MY19 ->).

Ron

[Lukeis]

Clear as mud indeed. I appreciate that explanation

so, to my second question I presume the jury is still out on the most reliable of the two?

Is the oil dilution problem fixed for existing early models? Or is that still an issue for those cars which needs to be looked out for? (Understand it’s fixed for 2019 onwards).

i can’t afford a 2019 D5 unless I wait another year :(

[IndusD4]

When models 2017 and 2018 came out the cars warned to do an oil change too frequently, it mentioned oil dilution. The car has no way of knowing this, it doesn't analyse the oil. A number of forum members (here and other forums) have tested their oils yet found the actual dilution to be minimal. LR referred to it as an early service warning issue and fixed it with software updates. My 2018 had its oil changed under warranty at 3 and 6 months, software updated at 6 months then at the annual service again. The second year I had no issues with additional oil changes at all, oil was changed after 12 months at the normal service.

There's many on this forum stating there is an oil dilution issue, but if you asked the actual owners I'd be surprised if any suffered actual oil dilution to the point where it was warranted the oil be changed when the car gave these "early oil change/service" warnings. I've owned a 2007 Nissan Pathfinder where you could see the oil level on the dipstick going up - I do believe that suffered from oil dilution way more than my D5 does.

I can't comment on the crank or inlet manifolds, I haven't read of issues here and on disco5.co.uk there is one report of something going bang but no explanation as to what the issue was.

Ron

[haydent]

Reposting this from reddit, TDV6 goes pop:


Was driving my car normally when I heard ticking and a big clunk sound I immediately pulled over. Got the car towed to the dealership they said the bottom of the engine has catastrophic damage and quoted a repair of $47,000 to replace the engine
The car is 2017 model and has done 120,000 km only used for long drives over 100km trips I brought it from the dealership and have full service history

Would it be covered under Australian consumer law since cars shouldn’t just have a major engine damage at 120,000 km specially when you pay over $130,000 for a new car like that






Reddit - Dive into anything (https://www.reddit.com/r/AusLegal/comments/1fiv23r/catastrophic_engine_failure_on_land_rover/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button)

[Numb Thumbs]

Reposting this from reddit, SDV6 goes pop:



Reddit - Dive into anything (https://www.reddit.com/r/AusLegal/comments/1fiv23r/catastrophic_engine_failure_on_land_rover/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button)


Can't be an SD6 as they didn't exist until 2019...

Cheers
Numb Thumbs ;)

[haydent]

Can't be an SD6 as they didn't exist until 2019...

Cheers
Numb Thumbs ;)

my mistake, corrected :)