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Chevrolet Bolt EV Traction Motor - Deep Dive

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Join us for a deep dive into the incredible Chevrolet Bolt EV Traction Motor (part of the 1ET25 Drive Unit). Watch the drive unit disassembly and learn about the internal parts.
Video Timeline:
Video introduction at

Drive Unit (DU) Specifications at

MUST SEE - Motor torque verses torque to the wheels at

Lubrication and coolant at

Drive Unit Identification and Option Codes at

See the Transmission Range Selector Actuator and shifter at

Transmission fluid fill, drain, and fluid level checking at

Transmission electric fluid pump (12V) operation at

Motor resolver and fluid temperature sensor connector at

Rear view and components at

Transmission holding fixture at

Transmission weight at

Electric Gerotor type fluid pump removal at

Removal of the Output Shafts at

Transmission Range Selector Actuator removal at

Transmission Case (Right Side Cover) removal at

Shift linkage, park pawl, and Internal Mode Switch (IMS) at

Ring gear, differential, bearings, and end-play shims at

Non-reusable aluminum gaskets at

Oil baffle and magnet at

Differential case removal at

Transmission Case Cover (Left Side Cover) removal at

Oil filter, Resolver, and fluid temperature sensor at

End view of motor rotor, stator, and lubrication/cooling channel at

Fluid filter removal and positioning at

Resolver removal at

Bearing center support removal at

Counter drive gear removal at

Lubrication channel and three-phase cable nut retainer removal at

Oil distribution channel removal at

Preparation for rotor removal at

MUST SEE - Rotor centering tool installation at

Oil sump cover removal at

Coolant sump cover removal at

Installation of Rotor puller tools at

MUST SEE - Pulling the Rotor from the Stator at

Rotor components at

Stator removal procedure at

MUST SEE - Stator unique design review at

The "Small Block Chevrolet" of electric motors at

THREE MOVING PARTS and reliability at

Video wrap-up at

Bearing Grey Coating Information Update:
Thank you to SeanBZA! "Grey coating is an insulator, to prevent circulating currents through the bearings from any slight imbalance in magnetic field in the motor. there is a single bearing that is grounded ( the shiny one) to prevent charge build up on the rotor and a flash over to the frame, but the rest have to be insulated so they do not have a shorted turn through the frame that can cause a high circulating current through the bearings that rapidly erodes them through arcing. There are current paths for this current via things like the output shafts and the selector forks, but they probably assumed that, being long thin wall section steel assemblies, this long path would both keep the current low enough not to cause any major extra wear, and also the long output shaft would be mostly self cancelling field wise as well.

A lot of larger electric motors handle this with one end having coated bearings, or they make them with ceramic bearing balls inside, or just make both sides with insulated bearing mounting frames, and provide a grounding carbon brush assembly to handle shaft grounding. Drawback of the coated bearing is that you have to ensure that there is absolutely no damage to the coating on the outside and the side facing the frame, so that there is no metal to metal path. However, depending on the exact coating applied, this coat can be both insulating and tougher than the steel of the bearing itself. grey would point to a spray on ceramic coating, probably vacuum deposited before final bearing assembly or applied as a plasma coating."

Shift Lever and Actuator system update:
The shift lever sends a request to a chassis control module (CCM) for the trans range desired. The CCM commands the shift actuator to move the mechanical linkage to the desired position. The internal mode switch (position sensor) inside the trans sends a signal verifying the current gear range selected. The systems also has a "default to park" option when a malfunction occurs which will prevent vehicle movement until the fault is repaired.

2017-2019 Chevrolet Bolt EV Drive Unit disassembly - A Youtube first!

Weber State University (WSU) - Department of Automotive Technology - Ardell Brown Technology Wing - Transmission Lab.

This is the seventh in a series of videos on the 2017-2019 Chevrolet Bolt EV

W.S.U is a leader in Hybrid and Electric Vehicle education. This topic is taught as part of our 4-year bachelor's degree program. For information joining the Weber Automotive program, visit:

This video was created and edited by Professor John D. Kelly at WSU. For a full biography, see

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