Топливный насос высокого давления дизельного двигателя G12V190PZL: конструкция, техническое обслужив

The fuel injection pump is one of the most critical components in a diesel engine, directly affecting engine performance, fuel efficiency, and operational reliability. In this guide, we’ll break down the Z-type and P9-type fuel injection pumps, along with their structure, maintenance practices, and transmission system—based on the 190 series diesel engine.

Z-Type Fuel Injection Pump: Structure and Features

The Z-type fuel injection pump is a plunger-type compound pump with a split-body design.

Operation and Maintenance of Z-Type Fuel Injection Pump

Proper maintenance is essential for long service life and optimal engine performance.

1. Use Clean, Filtered Fuel

Fuel entering the pump must be strictly filtered to prevent wear and blockage.

2. Regularly Check Injection Timing and Fuel Quantity

• Ensure the fuel feed advance angle is within specification

• Maintain uniform fuel delivery to all cylinders

3. Maintain Proper Lubrication

• Check oil level and quality regularly

• Replace or refill oil when necessary

• Keep oil level within dipstick markings

4. Ensure Smooth Movement of Components

Inspect:

• Adjusting rack

• Plunger assembly

• Camshaft

These parts must move freely without sticking.

5. Avoid Water Contamination 🚫

• Never wash the pump with water

• Keep covers sealed

• Lubricate components to prevent rust and corrosion

6. Air Bleeding Before Startup

After long downtime:

• Loosen vent screws

• Allow fuel to flow until no bubbles appear

• Tighten screws

7. Do Not Tamper with Adjustments

• Fuel limiter and rack linkage are factory sealed

• Unauthorized adjustment is strictly prohibited

Adjustment and Inspection Guidelines

• The injection pump is a precision assembly

• Must be tested on a specialized test bench

• Never adjust based solely on exhaust temperature

• Disassembly should only be performed by trained professionals

P9-Type Fuel Injection Pump Overview

The P9 fuel injection pump is commonly used in V-type engines (e.g., 12V engines).

Key Features:

• Dual pump configuration (left and right)

• Equipped with RSUV(Z) speed governor

• Fully enclosed pump body

• Suspended plunger sleeve structure

Functional Advantages:

• Adjustable fuel quantity balance between cylinders

• Injection timing can be fine-tuned using gaskets

• Optimized for efficient cam profile operation

⚠️ Important Note:
Different engine speeds require different pump types. Never interchange components randomly.

Injection Pump Transmission Device

Maintenance of Transmission Device

Keep It Clean

• Located outside the engine → prone to contamination

• Do not clean with water to avoid rust and damage

Check Fasteners Regularly

• Loose bolts can alter injection timing

Lubrication Requirements

• Use MOS₂ grease or No.3 lithium grease

• Lubricate every 250 operating hours

Disassembly Procedure (Simplified)

1. Remove protective cover

2. Disconnect coupling bolts

3. Remove injection pump

4. Open gearbox covers

5. Extract:

• Bearings

• Oil seals

• Drive shaft

• Bevel gears

6. Remove pump bracket

Inspection Checklist

After cleaning components, inspect for:

• Gear wear, cracks, or broken teeth

• Bearing scuffing or overheating

• Oil seal aging or leakage

Replace damaged parts immediately.

Reassembly Guidelines

1. Align Timing Marks Precisely

All components marked with “0” must be aligned:

• Camshaft and driving gear

• Driving and driven bevel gears

• Gear coupling rings

Incorrect alignment will cause improper fuel timing.

2. Maintain Proper Clearances

3. Final Steps

• Reassemble in reverse order

• Verify alignment and fit

• Fill grease into gear coupling

  
  

Common Problems and Solutions

Uneven Fuel Supply

• Cause: Incorrect adjustment or worn plunger

• Solution: Recalibrate on test bench

Hard Starting

• Cause: Air in fuel system

• Solution: Bleed air from pump

Abnormal Noise

• Cause: Gear wear or improper clearance

• Solution: Inspect and replace damaged parts

Conclusion

The fuel injection pump in 190 series diesel engines is a highly precise and essential component. Proper maintenance—including clean fuel usage, correct lubrication, and accurate timing alignment—ensures:

• Improved engine efficiency

• Longer service life

• Stable and reliable operation

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For best results, always follow manufacturer guidelines and rely on trained technicians for inspection and adjustment.