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AVI168A Alternator Rotor — Rebuilder Technical Specification
Technical specification TS-AVI168A-R | Audience: alternator rebuilders, fleet electricians and parts distributors. This rotor is the rotating magnetic core of Prestolite-type high-output alternators.
- Overview
- Recommended Products
1. Document Purpose
This specification covers the AVI168A rotor as an OEM replacement for Prestolite high-output alternators on heavy-duty buses, commercial vehicles and industrial equipment. As the rotating magnetic field core, the rotor determines charging efficiency, voltage stability and system durability — so rebuilders should verify the five blocks below before fitting.
2. Product Identification
Model |
AVI168A (OEM equivalent) |
Brand |
Prestolite (OEM equivalent) |
Place of origin |
China |
Certification |
SGS / TS16949 / ISO 9001 |
Voltage system |
12V / 24V dual compatible |
Warranty |
13 months |
Fig. 1 — AVI168A rotor assembly: claw poles, copper winding, slip rings, cooling fan and shaft (with Woodruff key)
3. Electrical Specification
Parameter |
Value |
Verification |
Field coil resistance |
2.8 – 3.2 Ω @ 20 °C |
Tolerance ±3% |
Max field current |
5.5 A continuous |
Matched to Prestolite regulators |
Insulation class |
Class H (180 °C) |
Epoxy encapsulation |
Dielectric test |
1500 VAC, 5 s |
100% tested |
Slip ring contact |
< 0.1 Ω resistance |
Silver-coated copper alloy |
Output support |
150–200 A alternator output |
With compatible stator |
4. Materials & Construction
Fig. 2 — Rotor winding detail: oxygen-free copper coils, Class H encapsulation
Fig. 3 — Winding and pole geometry: consistent turn count and insulation build
5. Mechanical & Thermal Data
Weight |
2.85 kg (approx.) |
Outer diameter |
112 mm |
Shaft diameter |
17 mm (standard) |
Balance grade |
ISO 1940 G2.5 |
Max operating speed |
12,000 RPM continuous |
Max operating temp |
200 °C (peak) |
Bench validation |
500+ hours full load, ambient up to 120 °C |
Residual unbalance |
< 0.5 g·mm |
Fig. 4 — Complete AVI168A alternator (application reference): the rotor fits inside this stator package
6. Compatibility Matrix
Alternator family |
Models |
Typical vehicles |
Prestolite |
8SC3110VC, 8RL3023C, 8LHA3037V |
Yuchai 6CT, Cummins 6CT |
Leece-Neville |
4850 series |
Volvo D12 |
Bus OEM fitments |
— |
Daewoo BS106, King Long XMQ6127, Higer KLQ6119 |
Direct replacement — includes pre-installed slip rings and fan. No soldering or rewinding: unbolt the old rotor, fit this unit, and re-gap.
Fig. 5 — Same production family (AVI 147D rotor shown): identical winding, balancing and test line
7. Acceptance & Warranty
Test |
Standard |
Winding resistance |
Tolerance ±3% |
Dielectric strength |
1500 VAC for 5 seconds |
Dynamic balance |
Residual unbalance < 0.5 g·mm |
Thermal cycle |
5 cycles, -40 °C to 180 °C |
Field failure rate < 0.2% over 2 years versus an industry average of 3–5%. Backed by a 13-month warranty with free technical support. Monthly production capacity 5,000+ rotors; 3,000+ units in stock, 5–7 day delivery.
8. Buyer FAQ
Q1. Which alternators does the AVI168A rotor fit?
It directly replaces the OEM Prestolite AVI168A rotor in alternators including Prestolite 8SC3110VC, 8RL3023C, 8LHA3037V, Leece-Neville 4850 series, and bus alternators on Yuchai, Cummins, Volvo and Daewoo platforms.
Q2. Do I need to rewind or modify anything?
No. The rotor ships with pre-installed slip rings and fan — unbolt the old rotor and install this unit. No soldering or rewinding.
Q3. What copper does the winding use?
99.98% oxygen-free copper, precision-wound and Class H encapsulated — test certificate available on request.
Q4. How is balance verified?
Every rotor is dynamically balanced to ISO 1940 G2.5 with residual unbalance below 0.5 g·mm, verified at 12,000 RPM.
Q5. What warranty do you offer?
13 months with free technical support; field failure rate below 0.2% over 2 years.
Q6. What is the lead time?
5–7 days after payment confirmation for stock models; 3,000+ units held for global dispatch.
Contact Our Export Team
Hunan Weili Auto Parts Appliance Co., Ltd. — founded in 2007, ISO 9001 & IATF 16949 certified manufacturer of bus & truck AC parts, electric fans, blowers, lighting and alternator components.
WhatsApp / WeChat: +86-18670382782 | Landline: +86-0731-82034997 / 82034998
E-Mail: [email protected] | Websites: www.weilipart.com | www.weiliautomotive.com | www.cooliparts.com
Send us your OEM part number, vehicle model or drawing — we will reply within 24 hours with a quotation and technical data sheet.
