ITB COGNOSCENTE
Glad to see some consistency but I can't read the gauges.Originally Posted by shervin
My failed HG leak numbers showed cylinder 4 and 5 down by about 10-12 psi and at 35%+ leak on those two and 10% on all other cylinders.
Grim is right. Check the water pump!
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________________________________
Nik
91' M5 3.9L Stroker
92' M5 3.8L
95' 540i6 Supercharged
95' 540i6 4.7 Stroker
95' 550i6 M70 Conversion
Member
Right now it's 32deg in Tehran.
The car is euro version but as I remember all E34 M5 have same water pump and radiator. Hot climate versions are for E34s other than M series. They have thicker radiator and more powerful AC system including bigger condenser and compressor. The most thickness in all E34's radiator is 42mm with 54 rows of tube. mine is too.
photo_4.jpgphoto_3.jpg
I just came home and you can see the engine temp in the pictures have been taken when I was in traffic jam with AC on and AUX fan full speed .
The left digital indicator in the picture is oil temp and the right one is coolant temp (downstream of coolant circulation just before water pump incoming. temp gauge is about 3/4.!
I've stayed in traffic for just about 15 minutes.
Last edited by shervin; 08-25-2017 at 01:17 PM.
FASTEN SEAT BELTS
100C is about right for the 3\4 part of the gauge.
Could be a bad pump.
Member
All about 155 to 160psi. the picture has been taken one year ago.
Water pump is replaced too, even though it was in good condition.
Did you have overheating issue? and just because of leakage between cylinder 4 and 5???
Member
I'm not sure about that.
In bad water pump cases you'll face overheating issue while radiator outlet is not too hot. because of slow moving coolant, it stay more in head and gets very hot, on the other side it'll get cold enough in radiator because it has time enough to get cold so temp differential will be big and this is not my case.
Last edited by shervin; 08-25-2017 at 01:51 PM.
Member
Even M5 had hot climate version. According to realoem it has different pump and smaller water pump/fan pulley so it spins faster. All this seems really weird...
What are the oil temps?
Maybe something is causing ridiculously high load for the engine at idle like something is seizing? That would be my last guess that the engine is under higher load at idle.
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Member
There is nothing seems abnormal with engine running.
Dino test also proof that her output is really good (about 272 wheel HP in Tehran that is 1400m above sea level)
Capture06.JPG
Last edited by shervin; 08-25-2017 at 02:23 PM.
Member
I'd go with the smaller water pump pulley.
- - - Updated - - -
Like this one: 11511706781 (130mm)
demet
Member
Mine is 130mm already.
Maybe better to try: 11 51 1 315 202 (102mm).
http://bmwfans.info/parts-catalog/E3..._fan_coupling/
circumference difference is about 8cm.
So by a rough calculation water pump as well as mechanical fan can spin about 210 rpm more at idle (about 20% more). does it really works?
Last edited by shervin; 08-30-2017 at 12:22 AM.
Member
Good one. I wonder if that is the pulley my old e23.
demet
Member
back with a goog news.
Found a 112mm pully in scrap yard and .....
now fan speed raises to about 1310rpm while engine revs 950
at idle with ac on and ambient 32deg, temp raises more slowly.
in 92deg aux fan goes for high speed and temp raising gets much more slowly (but still goes up)
by reving engine to about 1500 it starts going down.
in first gear with very low speed, temp comes down more rapidly.
just not intetested to talk about machanical fan noise!!!
It terrifies people walking in the street when I go for more than 4000rpm (lol)
anyhow thank you all for good consultations.
cheers
Last edited by shervin; 08-30-2017 at 12:28 AM.
ITB COGNOSCENTE
If those numbers aren't recent then I'd say they don't mean much.
And yes, I did have an overheating problem in traffic.
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________________________________
Nik
91' M5 3.9L Stroker
92' M5 3.8L
95' 540i6 Supercharged
95' 540i6 4.7 Stroker
95' 550i6 M70 Conversion
Member
Hey could you send me a PM? Got ?? for you
Member
hello everyone
I've replaced the mechanical viscous with an electric fan (to get rid of fan noise) and gain some power that had been lost to rotate such a large fan.
the result was impressive (I'll never back to the viscous fan).
I've put a digital temp sensor instead of AUX fan temp sensor to monitor the coolant temperature at radiator outlet (a digital temp sensor is already installed at the head coolant output).
low fan is adjusted at 81 for low speed and 88 for high speed.
after 15 minutes of driving the engine reaches to fully operating temperature then stopped the car to do check the measures...
The radiator outlet temp goes down to about 45 degree when the low speed fan is engaged while head output is remain about 81. then head output slowly creeping to the 88 while radiator outlet is still around 45 and then high speed engaged.
after that the radiator outlet temp drops to about 35 while head outlet is still around 88!!.
some information:
The water pump is checked.
Radiator is replaced.
Thermostat works properly (checked in a bowl of water on the oven) it opens at 70 and full open at 90.
cooling system is completely drained and fully cleaned (recently done a head work and valve adjustment).
Do you think that such a large differential between head outlet and rad outlet temperature is normal at idle speed?
I'd like to note that while cruising at 90km/h, rad out let is about 70 and head outlet about 80
my question is why at idle, head temp goes up to about 88 while rad outlet is much colder? even after a long period of time
Last edited by shervin; 06-06-2022 at 05:42 AM.
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