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How to drain oil from Denso 7SB16C

kgvickers on Mon August 04, 2008 2:52 PM User is offline

Year: 1997
Make: BMW
Model: 528i
Engine Size: 2.8L
Refrigerant Type: 134a

What's the proper way to drain the oil from a Denso 7SB16C?



TRB on Mon August 04, 2008 4:13 PM User is offlineView users profile

Don't think it has a drain plug. Turning the hub allowing it to pump out the ports would be the best option. Letting it drain for a while works also. But you will never get all of a certain oil out of a compressor.


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kgvickers on Mon August 04, 2008 5:57 PM User is offline

Thanks, I thought that was the case. I installed a new Denso copy during the wee hours of Saturday morning ~4am. I was told by the vendor to drain the assembly oil but I could not get a drop of anything out. Of course I couldn't simply call him at that time.

I installed it anyway and, per his instructions, added about 6 ounces of DEC PAG 46 (after flushing everything to bare metal, BTW). It seems to be cooling just fine and the spousal unit is very happy.

Matt L on Mon August 04, 2008 8:29 PM User is offline

I'm fairly sure that my '96 M-B has a 7SB16C, and it does have a drain port right next to the electrical connector for the clutch.

kgvickers on Mon August 04, 2008 11:05 PM User is offline

ARRRRRRGGGGG!!!! I looked and I think you are right! That does look like it would work as a drain plug!

What do I need to do now? Do I need to evacuate, flush, refill with oil, recharge? Or will it be ok as it is?

kgvickers on Tue August 05, 2008 11:42 AM User is offline

Follow Up:

I called my vendor and he said that their policy is to drain the factory oil from every new compressor prior to selling it, but he always advises customers to drain the oil just in case one got missed.

Since I could not get any oil out, apparently I got one that had been emptied already.

So all is well.

(breathing a big sigh of relief)

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