N54 overhaul question

dbond · 06-21-2015, 12:47 PM

I dropped the engine and taking the head off for head gasket leak. A lot of stuff is coming off: injectors, head cover, intake manifold, head, turbos.
What should I replace /update while I have the engine out and the head off?

Here is what I have on my “replace” list so far:

1. head gasket
2. head bolts
3. valve seals
4. injector o-rings
5. valve cover seal
6. oil filter housing gasket

Should I replace any seals in turbos? Any lines/houses require update? Keep in mind there are no oil leaks aside from the head gasket and turbos are healthy. It's May 2009 production N54 with 100k miles that apparently has some early production N54 problems fixed.

smitty513 · 06-21-2015, 03:55 PM

check your turbo oil supply/drain lines for clogging and collapsing and replace all the o-rings and seals on them and coolant lines. Oil pan gasket, carbon blast intake valves, might wanna check your cams for bearing ledge wear

gabylonfive · 06-21-2015, 11:57 PM

Since it's out, might as well do the PCV valve and hose too.

ucdbiendog · 06-22-2015, 07:25 PM

you going to post pics? this sounds awesome!

what about the front/rear main seals? coolant pump/tstat/hoses?

Indo Rider · 06-22-2015, 08:01 PM

Please share details/pics on head gasket failure. You don't hear about that much..

QuebecDIY · 10-30-2018, 06:15 PM

In order to make you really have an oil leak (oil in coolant is not necessarily head gasket leak on N54). I suggest you make a compression test.
If pressure holds, then you probably want to:
- change the seal at oil filter housing (between oil filter housing and engine head)
- and the one in front of the oil filter housing between the flange for the hose going to the oil cooler

MysticRob · 10-30-2018, 06:27 PM

Quote:

Originally Posted by QuebecDIY

In order to make you really have an oil leak (oil in coolant is not necessarily head gasket leak on N54). I suggest you make a compression test.
If pressure holds, then you probably want to:
- change the seal at oil filter housing (between oil filter housing and engine head)
- and the one in front of the oil filter housing between the flange for the hose going to the oil cooler

3 years too late there.

JonEQuest · 11-07-2018, 11:10 PM

Anybody know where to get the rings for less than $700 a set?

06-21-2015, 12:47 PM	#1
dbond Private First Class 53 Rep 199 Posts Drives: bmw Join Date: Nov 2012 Location: Phila iTrader: (3)	N54 overhaul question I dropped the engine and taking the head off for head gasket leak. A lot of stuff is coming off: injectors, head cover, intake manifold, head, turbos. What should I replace /update while I have the engine out and the head off? Here is what I have on my “replace” list so far: 1. head gasket 2. head bolts 3. valve seals 4. injector o-rings 5. valve cover seal 6. oil filter housing gasket Should I replace any seals in turbos? Any lines/houses require update? Keep in mind there are no oil leaks aside from the head gasket and turbos are healthy. It's May 2009 production N54 with 100k miles that apparently has some early production N54 problems fixed.
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06-21-2015, 03:55 PM	#2
smitty513 Private 20 Rep 72 Posts Drives: 07 E92 335i Join Date: Feb 2015 Location: ohio iTrader: (0)	check your turbo oil supply/drain lines for clogging and collapsing and replace all the o-rings and seals on them and coolant lines. Oil pan gasket, carbon blast intake valves, might wanna check your cams for bearing ledge wear
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06-21-2015, 11:57 PM	#3
gabylonfive First Lieutenant 52 Rep 335 Posts Drives: 04 M3, 05 Elise Join Date: Oct 2013 Location: Bay Area, CA iTrader: (3)	Since it's out, might as well do the PCV valve and hose too.
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06-22-2015, 07:25 PM	#4
ucdbiendog Captain 91 Rep 610 Posts Drives: 2008 335xi E90 Join Date: Mar 2008 Location: Reno, NV iTrader: (0)	you going to post pics? this sounds awesome! what about the front/rear main seals? coolant pump/tstat/hoses?
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06-22-2015, 08:01 PM	#5
Indo Rider Captain 625 Rep 785 Posts Drives: 135 Join Date: Apr 2012 Location: United States iTrader: (0)	Please share details/pics on head gasket failure. You don't hear about that much..
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10-30-2018, 06:15 PM	#6
QuebecDIY Private 55 Rep 59 Posts Drives: 135i 2008 Coupe Join Date: Oct 2018 Location: Montreal iTrader: (0)	In order to make you really have an oil leak (oil in coolant is not necessarily head gasket leak on N54). I suggest you make a compression test. If pressure holds, then you probably want to: - change the seal at oil filter housing (between oil filter housing and engine head) - and the one in front of the oil filter housing between the flange for the hose going to the oil cooler
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11-07-2018, 11:10 PM	#8
JonEQuest Captain 251 Rep 634 Posts Drives: 2008 335i Convertible 2007 335 Join Date: Jul 2018 Location: USA iTrader: (0)	Anybody know where to get the rings for less than $700 a set?
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