Servicing Bafang 8fun BBS02 • Removing motor shaft / Inspecting o'ring

Описание: Watch this video to understand the damage I am talking here:    • Bafang 8FUN - Noisy Motor Tear Down  

BrunoPOWEEER is everywhere:
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Complete tutorial playlist:    • Servicing Bafang BBS02 BBS01  
1. (intro) If you can cook, you can fix your eBike
2. Tools required: no need to buy "special Bafang tools"
3. Removing crank arms (avoid problems)
4. Removing mid-drive from your bicycle
5. Removing chainring ("sprocket" or "front gear")
6. Removing & Inspecting inside plastic protection
7. Opening bottom bracket
8. Inspecting bearings, axle & freewheel
9. Removing controller disconnecting sensors and 3-phase wires
10. Removing the waterproof silicone from wires
11. Losing motor wires to access internal gears
12. Opening the internal gear housing
13. Removing and inspecting nylon & pinion gear
14. Putting parts together + grease on internal gears
15. Waterproofing electric wires & sensors
16. (time-lapse) From parts to complete BBS02 in 32 seconds!

Optional:
17. Disconnecting the PAS sensor
18. Installing $2 temperature sensor
19. Removing the motor from BBS frame
20. Removing motor shaft / Inspecting o'ring
21. Measuring the motor shaft with micrometer
22. Motor shaft noise or missing o'ring? = Loctite 641 procedure
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My extremely overpowered & modified BBSHD setup:

Motor:
•Bafang BBSHD 1000w 48v (1455watts peak)
•Custom controller settings with 100% throttle enabled at PAS-0 and no speed limit (unloaded wheel spinning at 102kmh with 46T)
•46 tooth chainring (74.1km/h top speed on flat)
•189 RPM at 58.8v (factory settings 160 RPM maximum)
•4.8kg motor

Battery:
•Homemade 14s 5p 58.8v 14.5Ah battery pack capacity
•1,5 hours safe fast charge (6A 350w charger set at 59v)
•3.65kg battery pack transported inside my backpack connected to the bike with XT90-S high discharge anti-spark connector.
•70x NCR18650PF Panasonic High Current cells
•Waterproof "bare cells" pack style for better cooling
•No BMS for 100% charge (4.2v per cell) = 100% performance!!
•Range (with BBS02 motor): +/-26km in the city / 36km continuous full throttle with only few stops

Dashboard:
•V3 Cycle Analyst with with 1.00m ohms shunt
•Bafang C961 display
•2x 15 watts LED headlights (two modes: normal or high bean)
•Waterproof red LED voltmeter to monitor battery sag and performance during the ride.

Throttle / Brake Sensor:
•Left thumb throttle (connected to the BBSHD controller) adapted to road bike handlebar, set up between the brake lever and the bar (almost invisible) mounted on a copper T-joint (used for plumbing, same thickness as the handlebar) the long bit cut in half riveted to the bar with the other bit sticking out enough to mount the throttle.
•Magnetic cut-off sensor in line connected to my mechanical rear brakes

Bicycle:
•9kg Trek Road Bike
•Easton (rear) Shimano (front) performance 700c racing wheels with aerodynamic flat spokes
•Mechanical brakes