-zakladam tuto temu, mozno to niekoho zaujme, nakolko ide zima a coraz viac sa tu riesia problemy so zahrievanim motora
-pre neanglictinarov alebo slabych anglictinarov posluzi prekladac: http://translate.google.sk/
-pridavam link, navod na vymenu: http://www.youtube.com/watch?v=ZhtfKliAkiU
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The issue with the EGR 'stat in the M47/57, when the low temperature element starts working, it is only supposed to just keep the EGR cooler from overheating as I understand it, and it would be a small flow, until there is much more heat and the temperature is at full range. But if it is failing, or completely failed, the flow is far too much ahead of getting up to temperature. The flow doesn't/can't go through the main thermostat opening, it flows into the warming coolant (chilling it) preventing heat/fast heat up. In effect bypassing any low temperature regulation. When the main 'stat opens and the bypass heating closes, normal cooling can take place, the flow is drawn back through the engine via the pump, now cooling correctly.

We just don't have enough heat to get up to main thermstat temperatures, in some instances. Let alone get to the point where the second element in the EGR 'stat would normally open after the main 'stat is already drawing water the correct way.

It is this anomally, which in my understanding, is why some EGR 'stats can completely solve a coolant temperature issue. But if the main 'stat is opening low as well, it can't be identified, as it is masked by a faulty EGR 'stat.

Hence why some replacement EGR 'stats will then only improve the temperature, up to the main 'stat range, and then requires a main 'stat to get the full working temperature.

In the CAD illustration I put together, it is element '1' that is the common failure, leaves the first stage valve open at low temperatures. I believe it over cooks (prematurely), as it is rated at 70-degrees, but has a normal flow over it, once hot, of over 90 degrees, when the second element '2' extends and fully opens the mushroom head at the end of the 'stat.

Indeed N47 is completely different. The EGR cooler has constant coolant flow (6 & 7), the cooler housing (1) has the cooling element in the top 3/4 section or so, the bottom 1/4 is a bypass channel for the EGR gasses controlled by the vacuum valve (5)

postup vymeny: http://www.youtube.com/watch?v=ZhtfKliAkiU