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      01-04-2019, 10:00 AM   #1
Chrisg2121
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N63B44A valve stem seals

2010 750li with 145k miles. Smokes at startup n at idle. Will be pulling heads to replace valve stem seals, timing chains n guides n anything else that may be damaged
Pulled out engine last Saturday the dynamic drive system seemed a bit intimidating to deal with at first but it came apart easily
A piece of the blow off valve on bank 1 turbo had broken off n was sitting in the intercooler
Both turbos have damaged wastegate valves which I’m sure cause a horrible rattle
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      01-04-2019, 10:07 AM   #2
Chrisg2121
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Got the driver side head removed. Big difference in the heads between the n63b44a n the n63b44b having no valvetronic to mess with will make this a bit quicker to replace the valve stem seals. Timing marks lined up before disassembly. Crankshaft pulley has an MP mark which lines up with the divet in the timing cover n flat spots face up on the camshafts
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      01-04-2019, 10:13 AM   #3
Chrisg2121
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Pulled passenger side head now have to make my parts list n get everything ordered. Turbos look like they’ve been leaking as well n like I mentioned before the wastegate has some major play. I found a repair kit for the wastegate n rebuild kits for the turbos for fairly cheap so I will be ordering those as well
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      02-18-2019, 10:06 PM   #4
Chrisg2121
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Replacing valve stem seals
Cleaned up all the intake/exhaust valves and ports
Replaced rectangrings on all 4 cams
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      02-18-2019, 10:10 PM   #5
Chrisg2121
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Removed timing cover to replace chains, guides, tensioners and gaskets
Pulled trans to replace rear main seal and rear coolant jacket cover
Replaced turbo oil drain housing
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      02-18-2019, 10:14 PM   #6
Chrisg2121
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Disassembling turbos and replacing faulty wastegate assembly
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      02-18-2019, 10:19 PM   #7
Chrisg2121
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Rebuilding the turbos replacing the seals, journal bearing, and thrust bearing
Replaced blow off valves (one of them broke apart and was sitting in the intercooler)
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Last edited by Chrisg2121; 02-21-2019 at 07:24 AM..
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      02-18-2019, 10:22 PM   #8
Chrisg2121
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Installing the cylinder heads and getting the timing set up
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      02-18-2019, 10:24 PM   #9
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Getting everything plugged in
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      03-16-2019, 05:55 PM   #10
The-Traveler
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Quote:
Originally Posted by Chrisg2121 View Post
Replacing valve stem seals
Cleaned up all the intake/exhaust valves and ports
Replaced rectangrings on all 4 cams
Amazing work! Is this motor direct injected? Why are the valves and ports so clogged?!
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