David P
03-18-2005, 04:45 PM
Hi all
First post here although the board has been a mine of information over the last year. I have done so much of the stuff talked about like capacitors in instrument console,heater matrix etc. I could not have kept this car on the road without this board and Brunos site :)
Over the last month or so I have been overhauling the cooling system on my 1991e34 525 M50. Slight overheating on idle. Replaced radiator, it had a leak,new water pump old one had plastic impellor and changed thermostat. Still overheating on idle if heating is off
Fan seems not to pass the various tests, it seems to spin free when engine is hot so new coupling bought today.
Removed fan and when installing new one I noticed the old one was fitted to the back of the fan. The bentley manual, ETK and drawings on the box the new coupling came in all show it fitted to the front of the fan. Followed instructions and when refitted the fan was so close to the engine it would not rotate without hitting cooling pipes. Refitted with coupling on the back, rotates fine but fan spins faster when engine is cold !!! and freewheels when hot. Back to the ETK and found fan should have 11 blades mine has only 9 guess the wrong fan has been fitted in the past and maybe because of different design of center hub size means the viscous clutch is to far back from the radiator to get enough heat to tighten up
Can any body confirm this. I will get a new fan anyway .Maybe others with cooling problems should check the position of the coupling on the fan ie front or back mounting
Can anybody with M50 engine confirm the number of fan blades ( No A/C )
Dave
e34 525 1991 manual (UK)
__________________
First post here although the board has been a mine of information over the last year. I have done so much of the stuff talked about like capacitors in instrument console,heater matrix etc. I could not have kept this car on the road without this board and Brunos site :)
Over the last month or so I have been overhauling the cooling system on my 1991e34 525 M50. Slight overheating on idle. Replaced radiator, it had a leak,new water pump old one had plastic impellor and changed thermostat. Still overheating on idle if heating is off
Fan seems not to pass the various tests, it seems to spin free when engine is hot so new coupling bought today.
Removed fan and when installing new one I noticed the old one was fitted to the back of the fan. The bentley manual, ETK and drawings on the box the new coupling came in all show it fitted to the front of the fan. Followed instructions and when refitted the fan was so close to the engine it would not rotate without hitting cooling pipes. Refitted with coupling on the back, rotates fine but fan spins faster when engine is cold !!! and freewheels when hot. Back to the ETK and found fan should have 11 blades mine has only 9 guess the wrong fan has been fitted in the past and maybe because of different design of center hub size means the viscous clutch is to far back from the radiator to get enough heat to tighten up
Can any body confirm this. I will get a new fan anyway .Maybe others with cooling problems should check the position of the coupling on the fan ie front or back mounting
Can anybody with M50 engine confirm the number of fan blades ( No A/C )
Dave
e34 525 1991 manual (UK)
__________________