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Old 9th September 2010, 22:20   #1
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Default Diesel thermostat definative answer

Regarding my enquiries with the UK technical manager into whether BMW ever used a hotter thermostat in the M47R engine, this is the reply I have received. This comes from the BMW development engineers in Germany.

The M47R, as we called the engine, was different to the engine for the
320D. For the Rover ( 75) and Land Rover ( Freelander) application we
used the first common rail injection system.
I went back into my documentation and have spoken to the "older"
colleagues in the development about the "cold" running engine.
We have never used different Thermostat during the life span of the
entire M47 engine ( D and R), so we do not have different thermostats to
choose from. We have introduced different thermostats for the late M57
Anyway, we are sure, you cannot change the behavior of the engine with a different thermostat. At the time when we introduced the direct
injection diesel engine we had problems to get the engine to proper
working temperature, because it was so efficient.

We remember that we had big problems to get enough heat for the
passenger compartment heating, therefore we had additional heating.
Basically it would not help to get a different thermostat, because the
engine will not deliver more heat and therefore the operation
temperature of the thermostat does not matter.

I assume the cars are mostly driven in cities and will not get too much
load on the engines. There is no other way to get the engine to hotter temperatures as to put load on them ( faster driving or uphill driving !).
Sorry for this disappointing news , but if they want to play with
thermostats, then I would recommend that they will take one out of the
car and go to a spare part depot and have a look if they can find
another one from a different car, which will fit. At that time, the
supplier used mostly the same design for different car manufacturer.

BMW Group UK

So thats it boys back to the drawing board
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