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China factory Advance / CZPT /Fenjin Marine Gearbox 300 D300 D300A gearbox engine

Product Description


Advance / CHINAMFG /Fenjin Marine Gearbox 300 D300 D300A 

The diesel engine has the highest thermal efficiency (engine efficiency) of any practical internal or external combustion engine due to its very high expansion ratio and inherent lean burn which enables heat dissipation by the excess air. A small efficiency loss is also avoided compared to two-stroke non-direct-injection gasoline engines since unburned fuel is not present at valve overlap and therefore no fuel goes directly from the intake/injection to the exhaust. Low-speed diesel engines (as used in ships and other applications where overall engine weight is relatively unimportant) can have a thermal efficiency that exceeds 50%.

Product name Advance / CHINAMFG /Fenjin Marine Gearbox 300 D300 D300A
Ratio 1.87,2.04,2.54,3.00,3.53,4.10,4.47,4.61,4.94,5.44
KW/RPM 0.257,0.243,0.221,0.184,0.147,0.125
Application marine
Warranty 1 year or 1500h which occur first
Delivery By sea,by air,by express
Package 1. Wooden case 2. As customer requirement
Features 1.High anti-galling properties 
2.Less wear on the cylinder liner itself 
3.Less wear on the partner piston ring 
4.Less consumption of lubricant

Application: Marine
Function: Speed Changing
Layout: Three-Ring
Hardness: Soft Tooth Surface
Installation: Torque Arm Type
Step: Stepless


Customized Request


Steps to Replace a Faulty Gearbox in an Automobile

Replacing a faulty gearbox in an automobile is a complex task that requires proper tools, skills, and safety precautions. Here are the general steps involved in the process:

  1. Prepare the Vehicle: Park the vehicle on a flat surface and engage the parking brake. Disconnect the battery to ensure safety during the procedure.
  2. Drain Fluids: Drain the transmission fluid from the old gearbox into a suitable container.
  3. Disconnect Components: Remove any components obstructing access to the gearbox, such as the driveshaft, exhaust system, and linkage.
  4. Suspend the Engine: If necessary, use an engine hoist or support to suspend the engine safely.
  5. Support the Gearbox: Use a transmission jack to support the weight of the gearbox.
  6. Remove Gearbox: Detach the gearbox from the engine by removing bolts and disconnecting the clutch or torque converter.
  7. Install New Gearbox: Position the new gearbox onto the engine and secure it in place with bolts.
  8. Reconnect Components: Reattach the driveshaft, exhaust system, and linkage that were disconnected earlier.
  9. Refill Fluids: Fill the new gearbox with the appropriate transmission fluid according to the manufacturer’s specifications.
  10. Lower Engine: Carefully lower the engine back into its original position if it was suspended.
  11. Test and Adjust: Start the vehicle and test the new gearbox for proper operation. Check for any leaks, unusual noises, or gear shifting issues.
  12. Final Check: Double-check all connections and ensure that all components are properly secured.
  13. Dispose of Old Fluid: Dispose of the old transmission fluid safely and responsibly.
  14. Dispose of Old Gearbox: Properly dispose of the old gearbox according to local regulations.

It’s important to note that gearbox replacement can vary significantly depending on the vehicle’s make and model. It’s recommended to consult the vehicle’s service manual or seek professional assistance if you’re not experienced in automotive repair.

China factory Advance / CZPT /Fenjin Marine Gearbox 300 D300 D300A   gearbox engineChina factory Advance / CZPT /Fenjin Marine Gearbox 300 D300 D300A   gearbox engine
editor by CX 2023-09-12