N52 oil cooler gaskets

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peter2704

Member
So nex job oil/water filter gaskets , mt question is I expect some coolant spillage during the fix , after it’s done do I just top up or do I have to bleed the coolant system if so how do I do this
Cheers
 
Ignition on, foot on accelerator for 10 seconds. Pump will start, runs for about 10 seconds. Leave cap off till you see steady stream from the small dia. pipe.
 
flybobbie said:
Ignition on, foot on accelerator for 10 seconds. Pump will start, runs for about 10 seconds. Leave cap off till you see steady stream from the small dia. pipe.
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Just to confirm, unless E89 is different, the bleed process runs for nigh on 12 minutes on an E85, not 10 seconds.
However, if you are only doing the oil cooler gaskets you'll hardly lose enough coolant to notice (again based on E85 experience)
 
peter2704 said:
So nex job oil/water filter gaskets , mt question is I expect some coolant spillage during the fix , after it’s done do I just top up or do I have to bleed the coolant system if so how do I do this
Cheers
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While you're there you may well get contamination, either from your work, or from the gasket failing.

I think I did a coolant drain and bleed twice. First with a coolant flush, i.e. detergent to remove any oil, then once again with plain tap water.

Worth an oil change as well for the same reason. Not hard work, and not expensive to do it to a high standard.

BMW coolant usually works out best value as you can mix it with tap water and buy smaller concentrated bottles.
 
Scooba_Steve said:
While you're there you may well get contamination, either from your work, or from the gasket failing.
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Good call, I had the oil cooler gasket replaced a few years ago and it had definitely contaminated the coolant - in fact both oil and coolant are likely to be contaminated if the oil cooler gasket was on the way out before being replaced.

A few years later a gas test on my coolant was positive, but it took 8 minutes to react whereas it would usually react in a shorter period of time. We concluded it was a hangover from the oil cooler gasket change.

Cheers!
Andy
 
I think gaskets are ok I’m replacing as a precaution, I feel confident of doing the job just the coolant loss concerns me but if it’s minimal and the header replaced the loss then all good
 
So gaskets changed more messy than technical
The O ring in the top hose came out and too big to go back in , have trimmed a glue for the time being, seems to be holding till I get a new one ,now how to bleed. Any one know ?
 
peter2704 said:
now how to bleed. Any one know ?
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Should be as described in the second post. Ideally, connect to a power supply. If you PM me your VIN I can check the specific instructions for your type, but in general:

BMW TIS said:
After the cooling system has been filled with the vacuum filling unit, another bleeding procedure must be performed for vehicles with an electric coolant pump: Note:
Do not open the sealing cap of the coolant expansion tank during the bleeding procedure.

Switch on the low-beam headlights to perform the bleeding procedure. If the low-beam headlights are not switched on, the ignition (Terminal 15) will switch off automatically after a certain period of time and interrupt the bleeding procedure.

  1. Connect battery charger.
  2. Switch the ignition on.
  3. Switch on low-beam headlight.
  4. Set heating to maximum temperature. Take back blower to smallest stage.
  5. Driving experience switch must not be set to ECO PRO!
  6. Press accelerator pedal for 10 seconds to floor. Engine must not be started.
  7. The bleeding procedure was started by pressing the accelerator pedal and takes approx. 12 min. (the electrical coolant pump was activated and switches off automatically after approx. 12 min).
  8. Then adjust filling level in coolant expansion tank to maximum.
  9. Check cooling system for leaks.
  10. If the cooling system bleeding has to be performed again, deactivate DME completely (remove ignition key for approx. 3 minutes). Then repeat from point 3.
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On my car i think pump only runs for 10-20 seconds and stops.
Certainly on a full replace of coolant i had to go back in car several times to restart.
 
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