How to diagnose oil filter anti-drainback valve during oil+filter change?

[Jazz_89]

Hello everybody!
Half a year and a few thousand kilometers since the last oil change, the motor oil is turning dark, so it is time to replace it.

I want to test whether the anti-drainback system is working correctly, but last time I did not pay attention on how much oil was left i the oil canister.
Besides of checking the oil quantity in the canister, during the filter replacement, I want to install the center bolt and then pour oil into the canister. If it flushes back, this should indicate a drain-back issue, right? Or is the system only working when the canister cap is sealed and thus a slight pressure vacuum is achieved?

Thanks
Jazz

[shogun]

Just tell us the engine and built year that we know. Or show us the oil filter housing number + drawing on www.realoem.com

[Jazz_89]

It is a 1989 E34 535i.
The housing is shown here:
http://www.realoem.com/bmw/enUS/show...diagId=11_0480

I think the part number is 11421713345 i.e 11421720690


Thanks

[shogun]

see my website, click index fixes>>>oil systems >>>Low oil pressure fix: 735, same engine

A major problem with the Bmw E34/E32 M30 3.5l: slow oil pressure build up.

Symptoms:
• Oil pressure light abruptly began taking nine to ten seconds to go off upon cold starting.
• Dreaded"chime" for low oil pressure. When restarting after short runs the light goes out very quickly.

Diagnostic of the Canister problem from Adnan:
1. Removed pressure sensor and used a gauge to test actual pressure - normal.
2. Replaced sender with new one, no effect.
3. Changed oil filter and paid extra attention to o-ring on center bolt - no effect.
4. Let car sit a couple of days and opened canister bolt and took off cap. Canister was completely empty.
5. Cranked engine using diagnostic connector and watched oil come up immediately into canister through check valve, indicating that oil pump was primed and operational. Placed Saran Wrap over canister first.
6. Installed center bolt (without cap) and poured some oil into outer chamber. Oil drained back down the check valve (located on the floor of the canister near the lowest point).

Conclusion: the plastic-bodied check valve had failed and was allowing the canister to drain back. Consequently, when the engine was started after an overnight sit, the canister had to fill first before any pressure registered at the sender.
http://www.bmwe34.net/E34main/Trouble/OilCanister.htm

http://www.e32-schrauber.de/bmw/s-oelbehaelter.htm
http://bmwe32.masscom.net/johan/oilf..._canister.html
http://www.bimmerforums.com/forum/sh...ues-Need-Input