G400CDI spotted for sale
Not for me - because I can't cope with the steering wheel being by the pavement but might appeal to someone on here.
https://www.derrickwells.com/cars-for-sale/mercedes-benz-g-wagen-400/
Most of the G400 CDi have intergalactic mileages, showing that they can be reliable and reasonably economic. It's a complicated engine, but compared to, say, its V6 replacement, OM642, it's still well laid-out and not too difficult to work on.
When it works well, it's a fabulous engine.
(For a 2001 vehicle, ensure that its engine control unit has either been repaired or replaced due to faulty capacitors, and that there are no rattles from the timing chain, as from 2002 there were improved chain guides. But other than that, these engine have no real issues and with twin, variable-guide-vane turbos, they really go.)
Does the Om642 have any issues.? Engine is used some Jeeps, seem very good value!
My two penneth:
On paper, it seems like a good replacement for the V8, OM628, with almost as much power. When it works, it's a great engine, but I think the OM642 is perhaps an engine built a little too economically. To keep it compact, It has one large turbo in the middle of the Vee, and this makes servicing and maintenance a little difficult. It also has reported sludging issues, and as it uses 1st generation piezo injectors, there have been issues there as well. If you find as used one, hopefully, the issues will have been sorted.
MB has now moved away from V6, back to inline engines. These will be the new standard. The straight-6 permits packaging of turbos, DPF and Cats alongside the engine, where they should be.
Check out the OM 656 (and M256) :
https://www.daimler.com/innovation/diesel/om656-2.html
OM642
Servicing
Injectors:
http://forums.mercedesclub.org.uk/index.php?threads/w463-with-om642-v6-diesel-2008.154930/
Sludging:
http://www.gwoa.co.uk/content/new-recall-g350-bluetec-more-engine-cooling-problems
G400 drivers love their cars as the engine stands out.
Here is my take on Gs and diesel: it has never been the love affair it should have been. There have always been great expectations for the next engine generation. Whilst the next generation tended to be an improvement over the previous one, it never lived up to expectations. G drivers are a demanding species and the requirement for reliability on the one side and performance and fuel economy on the other have been a stretch. Having said all this, I have been driving a G350 Bluetec for more than six years now, the engine moves the 2.6 tons without effort, matches the character of the car well and there have been no reliability issues. The long-term fuel consumption is 23.6 mpg, the car being driven without fuel economy in mind. What else can you ask for?
.
...Here is my take on Gs and diesel: it has never been the love affair it should have been. ...
That's very true!
I think ALL the CDi engines, including the OM628 of the G400 have some issues because they are so complicated.
With the newer generations, like for example, the OM 642, over the the OM628, there are significant technology advances to reduce emissions and reduce fuel consumption and at the same time increase power and performance. In that respect, the OM642 is probably the better engine.
However, with more complex technology, there is always more chance of something going wrong, and as you say this may be a little at odds with the concept of a reliable off-roader.
I guess the last truly reliable standard W463 diesels were the OM603. But with those you may not have had the performance that one expects today.
... and the moment Mercedes added a turbocharger to the 603 the trouble started; the 350TD was the first "great expectations" engine with cylinder head and cooling issues.
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