Spring Starter Manufacturer & Supplier in China

About Cqstart

Chongqing Starting Power Unit Co., Ltd. (Cqstart) has been a pioneer in mechanical spring starter technology since 2008. We specialize in developing hundreds of applications for diesel engines, ensuring reliable starts in the most extreme conditions.

In 2020, Cqstart moved to a new state-of-the-art facility in Chongqing Shapingba International Enterprise Port, where we launched the 5th generation spring starter production line.

Our commitment to quality is reflected in our CCSC certification (GB/T19001-2016/ISO 9001:2015) and our unique digital test bench (SKQDJ A/B), enabling real-time monitoring of instantaneous working parameters.

World Record: 50L Displacement Start

Battery-Free Black Start Solutions

ATEX & Military Grade

Our Products

Engineered for reliability and performance in extreme environments. From compact 2L starters to world-record 50L systems.

7 Series Spring Starter

For engines under 2L displacement. Compact and lightweight for small diesel units.

Displacement: <2L
Application: Small generators, pumps
Design: Pre-engage, compact

5 Series Spring Starter

Ideal for 1-4L engines. Balanced performance and size.

Displacement: 1–4L
Application: Emergency backup, mobile units
Design: Dual-bore compatible

1 Series Spring Starter

Designed for 4–7L engines. High torque mechanical start.

Displacement: 4–7L
Application: Industrial pumps, marine
Design: Robust housing, corrosion-resistant

2 Series Spring Starter

For 7–10L engines. High reliability in harsh conditions.

Displacement: 7–10L
Application: Military, ATEX
Design: Explosion-proof options

4 Series Spring Starter

Engineered for 10–13L diesel engines. High energy storage.

Displacement: 10–13L
Application: Marine generators, fire pumps
Design: Parallel releasing tech

3 Series Spring Starter

For 13–16L engines. High durability and long cycle life.

Displacement: 13–16L
Application: Emergency power, remote sites
Design: Digital test verified

6 Series Spring Starter

For 16–30L engines. High-capacity mechanical energy storage.

Displacement: 16–30L
Application: Large industrial engines
Design: Dual spring system

0 Group System Spring Starter

World-record 50L displacement start. Ultimate emergency solution.

Displacement: Up to 50L
Application: Black start, dead-ship
Design: Max energy, parallel release

W Series Spring Starter

Wide range 1–30L. Versatile and field-proven.

Displacement: 1–30L
Application: Multi-use, backup systems
Design: Modular, easy install

Manual Generation Unit (M-Gen)

Enables black start for ECU-controlled engines without batteries.

Function: Power ECU during start
Compatibility: Electronic engines
Design: Hand-crank, compact

Barring Tool

Manual engine turning tool for maintenance and alignment.

Use: Engine barring, positioning
Design: Durable, ergonomic
Compatibility: Multiple flywheel types

Air Shut-off Valve

Critical safety component for diesel engine shutdown in emergencies.

Function: Cut air supply to stop engine
Application: Fire, explosion risk
Design: Manual or automatic

Why Choose Cqstart?

Engineered for reliability, safety, and performance in the most demanding environments.

World Record Performance

Capable of starting diesel engines up to 50L displacement — the highest in the world.

ATEX & Military Certified

Designed for hazardous environments including oilfields, mines, and military operations.

Battery-Free Black Start

Our M-Gen + Spring Starter combo enables true black start for ECU-controlled engines.

Digital Test Bench Verified

SKQDJ A/B system ensures precise monitoring of all working parameters.

5th Generation Production Line

State-of-the-art manufacturing in Chongqing Shapingba International Enterprise Port.

CCSC & ISO 9001 Certified

Compliant with GB/T19001-2016 / ISO 9001:2015 quality standards.

Applications

Trusted across industries where reliability and safety are non-negotiable.

Marine

Emergency start for marine generators and lifeboats. Ensures operation during power loss at sea.

ATEX

Used in oilfields, chemical plants, and mines where explosion-proof starting is required.

Military

Enables reliable engine start in cross-country vehicles and mobile power stations.

Emergency Rescue

Ensures emergency units start even when batteries are dead or maintenance is lacking.

Pump Systems

Critical for fire pumps during power failure — ensures life and property safety.

Black Start Solutions

Complete mechanical solution for dead-ship or off-grid diesel generator restart.

Frequently Asked Questions

What is a spring starter?

A mechanical device that stores manual cranking energy as spring potential energy and releases it instantly to start a diesel engine. No batteries or electricity required.

Can it start electronic engines?

Yes, when paired with our M-Gen manual generation unit, it can power the ECU and enable black start for electronically controlled engines.

Is installation difficult?

No. The spring starter can be installed on a secondary bore of the flywheel housing or used as a spare tool. 3D installation support is available.

What is the largest engine it can start?

Our 0 Group System Spring Starter holds the world record — capable of starting diesel engines up to 50L displacement (1500kW).

Is Cqstart ISO certified?

Yes. We are certified under CCSC (GB/T19001-2016 / ISO 9001:2015) quality management standards.

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Cqstart – World Leader in
Mechanical Spring Starting

About Cqstart