Quote from: Max-NL on 01 April 2024, 09:04 AMIs it a manual transmission, or an automatic transmission?it's an auto 1975 280se
Quote from: Magyar on 31 March 2024, 07:18 PMHi I have a mercedes 280 s e and when I drive 110 km/h the revs are at 40000, this seems too high, why are the revs so high??Unless you have installed a turbine engine I'm guessing you meant 4000 rpm? Gear ratios are HERE. You can calculate rpm and speed. Regardless, as an order of magnitude guess, it sounds like you're in 2nd gear. Or maybe third. You'd need to do the math to be exact.
Thanks
Quote from: Randys01 on 30 March 2024, 01:02 AMAs a rule of thumb the "indicated temp" should be about 55C more than the ambient temp.hi, I was doing 110km/h for an hour straight with ambient temperature being 22 degrees c.
Now this has a bit of tolerance but no more than 10 % . So at 30 deg C it should be reading 85Deg C.
Now in heavy traffic on a hot day with a/c on she might creep up to 90s. As soon as you get moving the temp should drop back a bit.
Get yourself a thermal infrared gun and take some temperatures. Make sure what you are seeing on the gauge is largely validated by an actual temp reading.
I find the most interesting is the actual return to the water pump [bottom radiator hose] and where the temp sender unit resides. [cyl head ]
There are many reasons an engine can run hot...not just a Merc.. but they all come back to the same thing..........is every part serviceable?
Slipping drive belt..worn waterpump..crud in the radiator..timing out..mixture out..blocked fins in the radiator...dodgey thermostat...blocked radiator hose/s..system properly bled....leaks in the system...brakes dragging etc etc..
Your photo does not mention the driving circumstance ie just did a run down the Tulla freeway at 115 kph in 30 dgrees C with air on etc? then I would agree the indicated temp was pretty reasonable.!!
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