I teardown and do an autopsy of a mistery BMW N42 engine. What I find inside is suprising and I try to figure out how it happened.
Mistery solved: https://www.youtube.com/watch?v=N7p4dGJHQZU
N42/N46 Fix oil consumption (valve stem seals replacement):
https://youtu.be/BMk7dwtj_i0
Buy Valve Spring Compressor Tool Kit for BMW N42/N46/N40/N45/N43: https://bimmerzen.com/store
N42/N46 Safe Valvetronic Removal:
https://youtu.be/Fn85Y-X9fAM
N42/N46 VANOS:
https://youtu.be/v_X96Oiu09o
https://youtu.be/yWBm5QGYJuE
N42/N46 Intake:
https://youtu.be/y6Sthgunm-g
https://youtu.be/uB77ykvf5iI
N43 Rebuild playlist:
https://www.youtube.com/playlist?list=PLcvaV8_M2DkZruvUXRvVDJQoxoqi7RXGh
0:00 Intro
2:16 Quick check for spun bearings - turning the crankshaft
3:04 Check oil filter for metal particles
4:48 Remove valve cover
5:26 Check valvetronic eccentric shaft and intermediate levers
7:06 Check slide rail and timing chain
7:40 Check the timing with timing VANOS locking tools
9:48 Removing VANOS adjusters
11:29 Remove valvetronic assembly
14:43 Inspecting valvetronic damage, bearing journals and camshafts
18:36 VANOS adjusters damaged, can they be reused?
19:20 Check cylinder head
20:23 Oil pan metal particles
22:24 Oil pickup strainer mesh
22:45 Broken oil pump chain guides and stuck tensioner
23:08 Remove the oil pump and balancing shafts unit
24:48 Signs of conrod bearing damage and color change
26:13 Inspecting con rod bearings
29:30 Inspecting broken oil pump chain guides, tensioner stuck
30:14 Removing the timing chain and slide rail
30:51 Remove the central hub bolt using a special holder tool
31:48 Remove the intake
35:18 Remove cylinder head
37:21 Inspect cylinder walls for scoring
40:05 Cylinder bolt hole contamination
40:24 Remove pistons and crankshaft
42:43 Inspect main crankshaft bearing damage
44:51 Inspect crankshaft bearing journals and oil drill holes
45:51 Inspect pistons and con rods
48:41 Oil pump damage inspection
49:46 How to dissasemble N42/N46 oil pump gear
50:07 Inspect oil filter housing check valve
51:05 Inspect VANOS oil check valves
51:53 Inspect cylinder head and valves
52:33 How did this get here?
54:30 What happened to this engine? Just a theory...
56:37 Timing issues, broken chain rail guides
1:02:30 What can be salvaged - what parts are reusable?
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BimmerZen assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. BimmerZen recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of BimmerZen , no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not BimmerZen.