Does the S65 have a engine case breather?

Mvy · 08-01-2018, 11:02 AM

Hey Folks,
With both my valve cover gaskets going on me and an annoying oil cap and valve cover leak ever since I SCed the motor, I am getting ready to do some service on the car and was thinking about checking the case breather to see if its contributing to the leak (not allowing the additional pressure to vent fast fast enough). I did a search but didnt find much. One thread said the S65 has no breather per se, but I read other posts where it was suggested there is one.

Has anyone touched this before and know what goes into checking it for clogs? Where is it located? Can I get to it without pulling the huffer off? I suspect I am getting a bit over normal case pressure now with the SC and that is encouraging my leaks. Im sure its also cause the seals are older and need to be replaced.

Appreciate any knowledge you can lend on this topic.

Mvy · 08-03-2018, 07:58 AM

Bump. Anyone??

Mvy · 08-03-2018, 01:59 PM

Thanks m3 post. I tried the old and new oil cap . Right now im on the new oil cap with black high temp rubber weld holding it to the plastic. As long as I get it really super free of oil on the rubber and mating surface, I have minimal leakage at the cap now. But that corresponds with a more noticeable leak at the valve covers giving the vapor a place to go other than through the cap. Thats why I was thinking it would be good to check all of these items at once. Ill give the new cap a go.

Mvy · 08-03-2018, 05:47 PM

Quote:

Originally Posted by M3Post

More Info:

Much appreciated. I ordered the cap. I'm doing gaskets next month. Will keep you posted but it looks far more robust than the current one. And it has m badging which is nice!

Mkhoid · 08-03-2018, 07:27 PM

I doubled gasket mine.

Bartledoo · 08-04-2018, 10:40 AM

Sounds like a PCV issue if sealing up the oil cap is truly causing more leaks elsewhere.

Mvy · 08-06-2018, 01:43 PM

Caps already here. That was fast!

kimiraikkonen · 08-06-2018, 05:27 PM

Quote:

Originally Posted by Mvy

Hey Folks,
With both my valve cover gaskets going on me and an annoying oil cap and valve cover leak ever since I SCed the motor, I am getting ready to do some service on the car and was thinking about checking the case breather to see if its contributing to the leak (not allowing the additional pressure to vent fast fast enough). I did a search but didnt find much. One thread said the S65 has no breather per se, but I read other posts where it was suggested there is one.

Has anyone touched this before and know what goes into checking it for clogs? Where is it located? Can I get to it without pulling the huffer off? I suspect I am getting a bit over normal case pressure now with the SC and that is encouraging my leaks. Im sure its also cause the seals are older and need to be replaced.

Appreciate any knowledge you can lend on this topic.

https://www.m3post.com/forums/showth...light=pcv+kimi

Mvy · 08-07-2018, 05:20 AM

Thanks all. Im ordering the PCV replacement with seals and hose. Will install next month. See my poll on valve cover gaskets as I am trying to make a decision on that ;-)

Here are the parts to order for anyone searching this thread in the future:
PCV Valve:11617836553
PCV vent valve seal:11157838370 and 11157838369
PCV hose:11617838288
Total cost from FCP Euro $76.

Redd · 08-07-2018, 07:13 AM

I had the E46 M3 oil cap in my S65, still leaked occasionally. Changed my valve covers, same oil cap, no more leaks.

fred340 · 08-07-2018, 07:45 AM

I can had some info on your question about the pcv system.
The s65 internal "pressure" is breathing freely through the two oil separtors on the valve covers. Oil vapors go through the intake and back through the 8 throttles. If oil droplets accumulate: they drop back into the check valve behind the bloc.

I am quoting directly from the Self Study Program of the S65/e90:

"The oil separators are bolted onto the cylinder head covers. The connection between the oil separator and the intake manifold is not screwed but plugged. This reduces the risk of incorrect assembly.
As is typical for the M series, no crankcase pressure control is mounted/integrated"

shimmy23 · 08-07-2018, 07:57 AM

Quote:

Originally Posted by Redd

I had the E46 M3 oil cap in my S65, still leaked occasionally. Changed my valve covers, same oil cap, no more leaks.

Changed the valve covers and gasket?

Mvy · 08-07-2018, 08:15 AM

Quote:

Originally Posted by fred340

As is typical for the M series, no crankcase pressure control is mounted/integrated"

Then help me understand what the Non Return Valve (PCV) part x11617836553 does please. I was told it is the pressure release valve for the crank case. Do I need to replace the oil separator too part 11157848155?

fred340 · 08-07-2018, 08:43 AM

The valve you are talking about is a check valve, located in the back of the engine.
It allows oil droplets that are located in the intake plenum to be drained back into the engine.

Your engine is breathing through the two oil separators and I dont see how your separators could be block. If you had overpressure inside the block your crank seals would also be pissing oil.

08-01-2018, 11:02 AM	#1
Mvy Captain 542 Rep 977 Posts Drives: 2008 E93 M3 Join Date: Nov 2014 Location: GA Peach iTrader: (0)	Does the S65 have a engine case breather? Hey Folks, With both my valve cover gaskets going on me and an annoying oil cap and valve cover leak ever since I SCed the motor, I am getting ready to do some service on the car and was thinking about checking the case breather to see if its contributing to the leak (not allowing the additional pressure to vent fast fast enough). I did a search but didnt find much. One thread said the S65 has no breather per se, but I read other posts where it was suggested there is one. Has anyone touched this before and know what goes into checking it for clogs? Where is it located? Can I get to it without pulling the huffer off? I suspect I am getting a bit over normal case pressure now with the SC and that is encouraging my leaks. Im sure its also cause the seals are older and need to be replaced. Appreciate any knowledge you can lend on this topic. __________________ Harrop Supercharger, BPM Tune, K/W Coil over kit, Stoptek BBK, Magnaflow exhaust, ear to ear grin everytime I drive... Last edited by Mvy; 08-03-2018 at 02:08 PM..
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08-03-2018, 07:58 AM	#2
Mvy Captain 542 Rep 977 Posts Drives: 2008 E93 M3 Join Date: Nov 2014 Location: GA Peach iTrader: (0)	Bump. Anyone?? __________________ Harrop Supercharger, BPM Tune, K/W Coil over kit, Stoptek BBK, Magnaflow exhaust, ear to ear grin everytime I drive...
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08-03-2018, 01:59 PM	#3
Mvy Captain 542 Rep 977 Posts Drives: 2008 E93 M3 Join Date: Nov 2014 Location: GA Peach iTrader: (0)	Thanks m3 post. I tried the old and new oil cap . Right now im on the new oil cap with black high temp rubber weld holding it to the plastic. As long as I get it really super free of oil on the rubber and mating surface, I have minimal leakage at the cap now. But that corresponds with a more noticeable leak at the valve covers giving the vapor a place to go other than through the cap. Thats why I was thinking it would be good to check all of these items at once. Ill give the new cap a go. __________________ Harrop Supercharger, BPM Tune, K/W Coil over kit, Stoptek BBK, Magnaflow exhaust, ear to ear grin everytime I drive...
	Appreciate 0 Quote

08-03-2018, 07:27 PM	#5
Mkhoid New Member 3 Rep 21 Posts Drives: 08 m3 sedan Join Date: Jul 2018 Location: Silver spring Maryland iTrader: (0)	I doubled gasket mine.
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08-04-2018, 10:40 AM	#6
Bartledoo Driver 2692 Rep 2,714 Posts Drives: 2011 E90 M3 6MT Join Date: Aug 2015 Location: Seattle, WA iTrader: (0) Garage List 2023 Corvette Stingray [0.00] 2002 Porsche Boxster [0.00] 2011 E90 M3 [0.00] 2021 Tesla Model Y [0.00]	Sounds like a PCV issue if sealing up the oil cap is truly causing more leaks elsewhere.
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08-06-2018, 01:43 PM	#7
Mvy Captain 542 Rep 977 Posts Drives: 2008 E93 M3 Join Date: Nov 2014 Location: GA Peach iTrader: (0)	Caps already here. That was fast! __________________ Harrop Supercharger, BPM Tune, K/W Coil over kit, Stoptek BBK, Magnaflow exhaust, ear to ear grin everytime I drive...
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08-07-2018, 05:20 AM	#9
Mvy Captain 542 Rep 977 Posts Drives: 2008 E93 M3 Join Date: Nov 2014 Location: GA Peach iTrader: (0)	Thanks all. Im ordering the PCV replacement with seals and hose. Will install next month. See my poll on valve cover gaskets as I am trying to make a decision on that ;-) Here are the parts to order for anyone searching this thread in the future: PCV Valve:11617836553 PCV vent valve seal:11157838370 and 11157838369 PCV hose:11617838288 Total cost from FCP Euro $76. __________________ Harrop Supercharger, BPM Tune, K/W Coil over kit, Stoptek BBK, Magnaflow exhaust, ear to ear grin everytime I drive... Last edited by Mvy; 08-07-2018 at 05:58 AM..
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08-07-2018, 07:13 AM	#10
Redd Brigadier General 3916 Rep 4,180 Posts Drives: 2010 BMW E92 M3 Dakar Edition Join Date: Jul 2015 Location: Malaysia iTrader: (0)	I had the E46 M3 oil cap in my S65, still leaked occasionally. Changed my valve covers, same oil cap, no more leaks.
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08-07-2018, 07:45 AM	#11
fred340 Private 80 Rep 62 Posts Drives: E90 M3&328 Join Date: Mar 2013 Location: montreal, qc iTrader: (0)	I can had some info on your question about the pcv system. The s65 internal "pressure" is breathing freely through the two oil separtors on the valve covers. Oil vapors go through the intake and back through the 8 throttles. If oil droplets accumulate: they drop back into the check valve behind the bloc. I am quoting directly from the Self Study Program of the S65/e90: "The oil separators are bolted onto the cylinder head covers. The connection between the oil separator and the intake manifold is not screwed but plugged. This reduces the risk of incorrect assembly. As is typical for the M series, no crankcase pressure control is mounted/integrated"
	Appreciate 0 Quote

08-07-2018, 08:43 AM	#14
fred340 Private 80 Rep 62 Posts Drives: E90 M3&328 Join Date: Mar 2013 Location: montreal, qc iTrader: (0)	The valve you are talking about is a check valve, located in the back of the engine. It allows oil droplets that are located in the intake plenum to be drained back into the engine. Your engine is breathing through the two oil separators and I dont see how your separators could be block. If you had overpressure inside the block your crank seals would also be pissing oil.
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