12V 1.2KW 8T Starter Motor QD114A for Air-cooled Diesel Engine 170F , 173F , 178F , 186F , 188F

Overview of the QD114A Starter Motor

This QD114A starter motor is the 12V, 1.2 kW replacement for Air-cooled Diesel Engine 170F , 173F , 178F , 186F , 188F applications. The housing, drive end and terminal positions follow the original design, so the unit bolts straight onto the bell housing and reuses the existing cabling.

Cranking load varies with temperature, battery condition and engine condition. A healthy starter has margin for all three; a worn one turns the engine just slowly enough that the control unit hesitates and the driver notices long, laboured starts.

Technical Summary

• Rated voltage: 12V
• Rated output: 1.2 kW
• Pinion: 8 teeth
• Type: reduction gear starter with pre-engaged solenoid
• Application: Air-cooled Diesel Engine 170F , 173F , 178F , 186F , 188F
• Net weight: approximately 3.55 kg
• Condition: new, direct replacement for the original unit

A 12V 1.2 kW rating is the output the motor can hold while cranking, not a peak figure. It is sized so the engine reaches starting speed on the first or second revolution, which is what makes a healthy start feel immediate.

The reduction gearset lets the motor run at high speed while the pinion turns slowly with high torque, which is why the unit stays compact enough for a crowded engine bay.

Reference Numbers and Cross References

Cross references for this starter are listed below. They are a matching aid rather than a substitute for checking the number on the old unit:

• QD114A
• 170F
• 173F
• 178F
• 186F
• 188F
• 192F

Several numbers in this list belong to complete starter assemblies while others refer to the motor only. A visual check of the drive end protects against the most common ordering error. This starter is listed with 7 references in total.

Matching the Unit to the Vehicle

This starter family was fitted to a range of the manufacturer applications, and the part number changed as engines and flywheels were revised. The unit listed here covers the references above and is a direct replacement where those numbers match. Because the QD114A reuses the original bolts and connectors, no adapters are needed on Air-cooled Diesel Engine 170F , 173F , 178F , 186F , 188F.

A mismatched pinion is the most common cause of a starter that engages noisily or refuses to mesh. Compare the tooth count before fitting, not after.

Why These Starters Fail

The brush plate is the second common failure point. Brushes shorten gradually, spring pressure falls, and contact becomes intermittent. Cranking speed drops a little every week until the engine refuses to start on a cold morning.

Heat is the underlying cause in most cases. The starter sits close to the exhaust, and after a hot shutdown the solenoid winding and brush plate soak in heat with no airflow. Resin hardens, springs lose tension and the contact oxidises. Owners of Air-cooled Diesel Engine 170F , 173F , 178F , 186F , 188F should treat the QD114A reference list as a starting point, not the final answer.

Fault Symptoms

• Cranking that sounds normal but takes longer than it used to
• Several attempts needed before the motor engages
• Black carbon dust inside the drive end housing
• Voltage dip that dims the lights during cranking
• Starter that responds to a tap on the housing but not to the key alone

A cranking voltage test separates the starter from the rest of the circuit. If battery voltage stays healthy at the terminals but drops sharply at the starter stud, the cable or the connection is at fault rather than the motor. Fitting the QD114A correctly takes less time than diagnosing the original fault.

Pre-Fit Checklist

• Condition of the old pinion and ring gear before the new unit goes in
• Main cable continuity and the condition of the lug at the starter stud
• Battery voltage while cranking, measured at the battery posts
• Mounting face cleanliness and bolt condition
• That the replacement terminal layout matches the original harness

Most comebacks after a starter replacement trace back to something that was not checked before the unit went on: a tired battery, a corroded earth or a chipped ring gear. Ten minutes with a multimeter and a torch prevents the second repair.

Installation Notes

With the battery isolated, remove any heat shield or ducting that blocks access and disconnect the main cable and solenoid connector. Support the unit before the mounting bolts come out; these starters are heavy enough to damage surrounding parts if they drop.

Check the ring gear through the aperture before fitting. Install the new unit with the original bolts, reconnect the cables in the same order and tighten the main terminal without over-stressing the stud. Crank briefly and confirm the pinion releases as the engine fires. Owners of Air-cooled Diesel Engine 170F , 173F , 178F , 186F , 188F should treat the QD114A reference list as a starting point, not the final answer.

Quality Control and Supply from Hejian Nuojin Auto Parts Co., Ltd.

Each production batch is inspected for housing dimensions, terminal integrity and pinion fit, and every starter is bench tested before it is boxed. Units ship in neutral cartons with foam protection, which keeps freight damage low and allows distributors to label stock under their own brand.

Common references are kept in stock for fast dispatch, volume orders are delivered in around 30 days and each starter carries a one-year warranty against manufacturing defects.

Frequently Asked Questions

Does this starter come with the solenoid?

Yes. The unit is supplied complete with its solenoid, as shown in the product photographs. Mounting bolts are not included.

Why does the starter work cold but fail when hot?

Heat raises solenoid resistance and reduces brush spring pressure. Both effects build up gradually and appear first on a hot restart.

Does the starter need any maintenance?

No routine maintenance is required. Keeping the battery, terminals and earth connections clean is what extends starter life in practice.

How long should a replacement starter last?

Service life depends on starting frequency, battery condition and heat exposure. On a daily-driven vehicle with clean connections, ten years or more is realistic.