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Shanrock316 Shanrock316 is offline
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Car: 2009 335i 6m coupe
Default Oil in coolant after resealing filter housing - 12-15-2019, 06:53 PM

Hello all,

2009 335i.

Do the oil filter housings or oil coolers fail on the N54s?

Just resealed the oil filter housing and cooler. After it got fully warmed up it started putting oil in the coolant again, quickly.

Iím glad to open it back up , but curious if it could be something other than a pinched rubber seal. Iím certain it was clean and put back on square.
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Bbelstad Bbelstad is offline
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Car: 08 E60 535i
Default 12-15-2019, 08:09 PM

Head gasket leaking? Not sure where else it would be mixing other than cylinder head and/or the oil cooler. Since your positive the oil filter housing is seated and sealed good, I'd think head gasket but I'm not that familiar with the engine just yet.

Did you replace both gaskets in the cooler? The oil gasket as well as the thermostat/coolant one?


Brandon
Hayden, Idaho.

* 08' 535I. * JB4 W/ Bluetooth Connect & custom tune. * Billy Boat 535I 3.5" *****-back exhaust W/ resonator delete. * BMS DCI. * NGK 2 step colder plugs @ .020" (And I mean .020" on money!). * New Eldor coils. * BMS BOV adapter and BMS Vac side OCC. * BMS Chargepipe. * TIAL BOV W/ Hard 1/4" Vacuum line W/stock spring. * XHP Stage 2 * C-@-T TUBES.





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Shanrock316 Shanrock316 is offline
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Default 12-16-2019, 04:57 AM

Yep, resealed the housing to the head and the oil cooler to housing. Is head gasket failure an issue with these engines? No sign of coolant in oil.

Actually it was a ton of stuff like intake service, oil change, water pump, thermostat, brakes and various coolant lines. Also replaces a wheel that was looking rough.
Seeing oil come out of the overflow after all this is a bit troubling
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codesx codesx is offline
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Car: 2008 335i Vert (E93, N54)
Default 12-16-2019, 10:26 AM

I got oil in my coolant reservoir after doing mine.
Turned out I let oil spill into the coolant section when I removed the OFH.
The recirculator pulled the oil and put it in the coolant reservoir, where it it floated.
Stupid me, I disconnected a lower rad hose, allowing the oil to run from the reservoir into the coolant pump, and thus through whole system - while I should have shopvac'ed the oil/coolant out, then removed and washed the reservoir (which I had to do later, along with a professional coolant flush).

This is to say... it may not actually be leaking any more. Maybe it's oil introduced during the job... take it out, clean things up and see. (I did a full removal again, all for naught)


--

2008 335i Convertible, E93, N54, A/T (200,000+ km)
Wheels: 322 | Tires: R.275/35r18, F.245/40r18
TUNE: JB4/Trebila | 24 PSI | 100% Meth via dual BM5 | 94 Octane
BMS: JB4, Map 6 | WMI | 5" FMIC | OCC | DCI | Cowel Filters
TMAP: 3.5 barr
xHP Stage 3 (v2.0)
VRSF CP | HKS BOV
RB PCV Valve
NGK 5992 Plugs @ .020

Maintenance:
2018 - A/T Replaced | Plugs | Ign Coils | Walnut Blasting
2019 - Index 12 Injectors | VCG | OFHG & O-rings | Alternator w/ Clutch Pulley | Water Pump & TStat
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Shanrock316 Shanrock316 is offline
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Default 12-16-2019, 11:05 AM

Unfortunately the case with mine is oil still going into coolant and fast. It’s pushing oil out of the overflow with engine running. Started after 20 mins of driving.

This morning I removed the oil filter cap and can watch the oil level change in the area the filter goes when I squeeze the upper radiator hose.

I’m thinking either the new, according to ESC tuning better than BMW seal has failed or the housing has a crack in it.

Going to open it up again tonight.
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codesx codesx is offline
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Default 12-16-2019, 01:29 PM

Sucks.
My oil pushed when I squeezed the radiator hose too.

When you open, have coolant hose off OFH assembly to prevent oil from getting in. (Doesn't matter much at this point, as it needs cleansing)

As oil has more pressure, it's less likely for a breach to get coolant in the oil. Check for this though.

What I noticed the second time removing my OFH assay was that the pooled oil didnt have coolant, that's when I realized it was trapped between the recirculate hose and the tank... until I removed a lower radiator hose and it dropped into the pump *hand to my own face*

I cleaned the surfaces (carefully) with flat razor and grooves with mini slotted screw driver. Then polished. I pre-oiled surfaces both times I did it, even though I heard one suggest against it. (To me, it's like putting motor oil on the oil filter gasket... you do it for best initial sealing)


--

2008 335i Convertible, E93, N54, A/T (200,000+ km)
Wheels: 322 | Tires: R.275/35r18, F.245/40r18
TUNE: JB4/Trebila | 24 PSI | 100% Meth via dual BM5 | 94 Octane
BMS: JB4, Map 6 | WMI | 5" FMIC | OCC | DCI | Cowel Filters
TMAP: 3.5 barr
xHP Stage 3 (v2.0)
VRSF CP | HKS BOV
RB PCV Valve
NGK 5992 Plugs @ .020

Maintenance:
2018 - A/T Replaced | Plugs | Ign Coils | Walnut Blasting
2019 - Index 12 Injectors | VCG | OFHG & O-rings | Alternator w/ Clutch Pulley | Water Pump & TStat
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Shanrock316 Shanrock316 is offline
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Default 12-16-2019, 05:06 PM

Housing cracked. Pics too big and not learning to resize. The much beefier seal split the groove it seats in in the OFH.

Found the broken piece in the oil cooler spring. Looks like the only piece, thank you lord.

Wonder if they have had other complaints....
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Bbelstad Bbelstad is offline
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Car: 08 E60 535i
Default 12-16-2019, 08:20 PM

Quote:
Originally Posted by Shanrock316
Housing cracked. Pics too big and not learning to resize. The much beefier seal split the groove it seats in in the OFH.

Found the broken piece in the oil cooler spring. Looks like the only piece, thank you lord.

Wonder if they have had other complaints....
OH MY!! I haven't heard of that happening before. Maybe more common than I'd think?? Have you got a hold of ECS tuning? Maybe they know about any oversize gaskets causing such issues. Maybe even help the repair bill.....


Brandon
Hayden, Idaho.

* 08' 535I. * JB4 W/ Bluetooth Connect & custom tune. * Billy Boat 535I 3.5" *****-back exhaust W/ resonator delete. * BMS DCI. * NGK 2 step colder plugs @ .020" (And I mean .020" on money!). * New Eldor coils. * BMS BOV adapter and BMS Vac side OCC. * BMS Chargepipe. * TIAL BOV W/ Hard 1/4" Vacuum line W/stock spring. * XHP Stage 2 * C-@-T TUBES.





[/SIGPIC]
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zach1328 zach1328 is offline
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Default 12-16-2019, 10:49 PM

Cracked OFH on the N54 is not uncommon. The N54 is getting old and these engines are at the point in their lives where, in my opinion, gaskets should not be replaced by themselves.

If the OFHG is leaking - replace the entire housing.
If the VCG is leaking - replace the entire valve cover.

That may not be the right approach for everyone, but most N54's are 10-13 years old and have spent a lot of their lives tuned and pushed around.


2007 335i - JB4 + MHD Pump BEF, DCI, VRSF **, MMP stock location inlets/outlets, XHP Stage 3, TC Kline SA, M3 F/R control arms
2008 535i
N54
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Shanrock316 Shanrock316 is offline
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Default 12-17-2019, 04:53 AM

And now for the cleaning of the cooling system. I pushed 20 or so gallons of hot water and degreaser through the system last night with a shop vac hooked to the heater
hose and then the radiator. Sooo much oil.
It’s cleaner but far from clean.
Not sure the best way once it’s all back together. Any suggestions?
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codesx codesx is offline
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Default 12-19-2019, 10:41 AM

Quote:
Originally Posted by Shanrock316
And now for the cleaning of the cooling system. I pushed 20 or so gallons of hot water and degreaser through the system last night with a shop vac hooked to the heater
hose and then the radiator. Sooo much oil.
Itís cleaner but far from clean.
Not sure the best way once itís all back together. Any suggestions?

I gave up quickly when my oil got mixed.
I paid a reputable garage to do a 'flush'.
Months later, the coolant is flawlessly clean.
There must be an additive besides a generic degreaser?
Whatever you put in, make sure it doesn't damage the pumps bearings, which are coolant maintained.


--

2008 335i Convertible, E93, N54, A/T (200,000+ km)
Wheels: 322 | Tires: R.275/35r18, F.245/40r18
TUNE: JB4/Trebila | 24 PSI | 100% Meth via dual BM5 | 94 Octane
BMS: JB4, Map 6 | WMI | 5" FMIC | OCC | DCI | Cowel Filters
TMAP: 3.5 barr
xHP Stage 3 (v2.0)
VRSF CP | HKS BOV
RB PCV Valve
NGK 5992 Plugs @ .020

Maintenance:
2018 - A/T Replaced | Plugs | Ign Coils | Walnut Blasting
2019 - Index 12 Injectors | VCG | OFHG & O-rings | Alternator w/ Clutch Pulley | Water Pump & TStat
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