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Info: How to Clean AOS

A suggested procedure for cleaning the air/oil separator is outlines below:

Remove air/oil separator in accordance with the Service Manual.

Flush the air/oil separator with mineral spirits to remove oil.

Utilizing compressed air, remove mineral spirits from air/oil separator.

Place entire air/oil separator in container of Berryman’s Chem-Dip making sure unit is submerged, and all air pockets have been removed from internal surfaces of the air/oil separator.

Soak air/oil separator overnight for best results.

Remove the air/oil separator from the Berryman’s container and rinse with water.
Utilizing compressed air, remove any water from both inside and outside of the
air/oil separator.
Reinstall the air/oil separator
Check for oil leaks and verify proper operation.



Berryman's Container is just the bucket of Chem-Dip "Carb and Parts Cleaner"
The AOS WILL cause buildup on the bottom of it after age. This would help function and proper usage of the AOS.



Just thought I'd share with you guys, since a lot of people say use water....then Seafoam. This is much more effective. Buy some ChemDip and stick it in over night. Flush and it makes the oil easier to get out.
Old 03-21-2013, 01:55 AM
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Nice. Thanks for the information on cleaning.

Here is a link that may help new owners understand why the AOS may need to be cleaned:

Oil filler/separator is on a 944 - Rennlist Discussion Forums

J_AZ
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Old 03-21-2013, 04:43 AM
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The top "cap" can also be removed, revealing a now brittle o-ring.
It would also be easier to clean it this way.

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Old 03-21-2013, 07:41 AM
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Very timely.

Many thanks

Greg
Old 03-21-2013, 10:39 PM
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What size is the o-ring or is it available from the part side???
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Old 03-21-2013, 10:53 PM
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The o-ring is not available for purchase. Size is about 80mm OD, and 2.5 mm thickness. The old one can be used to find something that will work.
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Old 03-23-2013, 03:44 AM
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968 oil separator cap

Does anyone know how to remove the cap to the AOS on a 968?
Old 07-25-2013, 08:29 PM
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For anyone that is interested - the o-ring for the cover is an AS568A-151 size. It is available in hi-temp silicone from McMaster-Carr, p/n 9396K172. A pack of 10 costs $8.09.

I bought a pack and have 9 more left. Rather than trying to sell them, I would like to pay them forward to other 944 owners. If you would like one, send me a pm, I'll give you my address, then just send me a SSAE and I'll send you one until I run out.
Old 06-03-2014, 07:58 PM
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The question I have is why bother cleaning the AOS?
Old 06-03-2014, 08:02 PM
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perhaps to help oil drain better at the bottom?

but there's really nothing at all inside of it. it is just a can with a few holes in it..
Old 06-03-2014, 08:26 PM
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Silicone Viton or Nitrile for o-rings

I was curious about the different o-ring materials since there are so many & found Chemical Compatibility Guide. Comparing Silicone and "Motor oils" returns "Good" but common Nitrile (NBR) or Viton (FKM) both come back as excellent. I'm no chemist, just passing along what I find. I thought silicone would be better, maybe not? Am I missing something? Just trying to learn something new.
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Last edited by 88Silver924S; 06-03-2014 at 11:07 PM..
Old 06-03-2014, 11:02 PM
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Porsche Crest Smoke at Start up

Can this cleaning procedure be used on 2001 986 boxster as well?

Last edited by wayne986; 06-04-2014 at 04:47 AM.. Reason: anybody can reply
Old 06-04-2014, 04:43 AM
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BUmping this up for the records and future searches...

McMaster-Carr pn# 9396K172 (as mentioned above) is a perfect fit for the 944 AOS. (Unit shown is an S2 AOS)
See attached photo! (You only need one but I wanted to show fitment on both sides)

Old 04-11-2015, 07:59 AM
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I've found this website to be really useful. https://trp.co.uk/ffkm/

Plenty of information about O-rings and you can receive a quote off them by calling them up.
Old 09-25-2018, 01:50 AM
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Quote:
Originally Posted by Jrboulder View Post
The question I have is why bother cleaning the AOS?
The idea of an oil and air separator is to extract the oil from the air before it's sent back to the intake manifold and put it someplace where it won't cause a problem,like the crankcase. If it's goobered up or if the seals fail it'll most likely end up in the intake system. Just a small amount in there will put a frown on your face.It's a mess to clean and needs to be on the same service cycle as the timing/balance shaft belts. Cleaning and changing two seals at a nominal cost and while you're there the dipstick seal. When you start sucking oil,you'll know it!

Old 10-03-2018, 12:12 PM
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^^ a little smoky, but your valves have never run quieter/smoother 8-)
Old 10-03-2018, 12:49 PM
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