Voila ce que j'ai trouvé qui va dans ce sens, je vais essayer d'en trouver plus :
KV6 launched in 800 and as we know replaced the absolutely excellent Honda C27A.
95% of early units failed at low mileages (less than 30K) with water in the oil, oil in the water, or failed compression containment - HGF.
Underlying cause found to be cylinder liner movement.
Some revisions made in 800, but as you say, typical that duff engines still fitted. In fact, some customers shelled out for new engines out of warranty to be fitted with the same flawed stuff leaving them immobile 15 months later!!
Anyway, the engine was substantially redisigned for 75:
BMW invested in a new line to build the engines at the rate required, getting rid of the low volume "trolley" assembly methods used for 800 applications.
Castings and other production processes were improved to much better tolerances
Some of the changes:
Engine sported completely new engine management, Siemens 2000 as opposed to MEMS and ALL SENSORS WERE NEW.
New "Denso" (high quality gear as we know from our 827 days :biggrin:) coils, and other ancillaries such as alternator and starter motor.
New PAS pump
Different exhaust valves
Different oil cooler
Castings substantially revised and tolerances improved as above, but NB: new shape heads and revised cylinder block.
New water pump
New sump
New oil pump, oil filter housing and filter
New Air assisted fuel injectors
New cam dampers
Return less fuel system,
New heavily revised VIS system.
etc, etc.
It is a good engine now and although there are a few failures here and there, it is a lot better than what it was.
One thing worth noting though is that one of the only issues with the engine now seems to be a poor VIS.
There have been a few cases of the internal valves sticking and some parts can, after time fall off into . . . . . .
The problem with this is that there is nothing to tell the driver there is a problem as the engine management light does not come on. Dealers diagnostic equipment also occasionally fails to pick up a problem!!
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Mais aussi :
It has been said that the 2.5 as it was before the Rover 75 was introduced was a bit weak but BMW worked with Rover to overcome the weaknesses and make it almost bomb-proof. If that is so, and since you received your new engine after the launch of the 75, I would have thought yours would be OK for a long while yet.
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Sujet: [VENTE] - MG ZS 180 phase 1 (Lu 20146 fois)