yanmar 4TNE92 4TNE94L 4TNE98 TROUBLESHOOTING BY MEASURING COMPRESSION PRESSURE
Compression pressure drop is one of major causes of increasing blow-by gas (engine oil contamination or increased engine oil consumption as a resultant phenomenon) or starting failure. The compression pressure is affected by the following factors:
1. Degree of clearance between piston and cylinder
2. Degree of clearance at intake / exhaust valve seat
3. Gas leak from nozzle gasket or cylinder head gasket
The pressure will drop due to increased parts wear. Pressure drop reduces the durability of the engine.
A pressure drop may also be caused by scratched cylinder or piston by dust entrance from the dirty air cleaner element or worn or broken piston ring. Measure the compression pressure to determine the condition of the engine.
Compression Pressure Measurement Method
1. Warm up the engine.
2. Stop the engine. Remove the high-pressure fuel injection lines as an assembly from the engine. Remove the fuel injector from the cylinder to be measured.
3. Crank the engine with the stop handle at the stop position (no injection state) before installing the compression gauge (Figure 13-1, (1)) adapter.
4. Install a gasket at the tip end of the compression gauge adapter. Install the compression gauge and the compression gauge adapter at the cylinder to be measured.
5. Crank the engine until the compression gauge reading is stabilized.
- Figure 13-1
6. After performing the compression check, remove the compression gauge and compression gauge adapter from the cylinder. Install the fuel injector and high-pressure fuel injection lines.
yanmar industrial engines 4TNE92 4TNE94L 4TNE98 SERVICE REPAIR GUIDE PDF MANUAL
CONTENTS:
- Introduction
- Yanmar Warranties
- Safety
- General Service Information
- Periodic Maintenance
- Engine
- Fuel System
- Cooling System
- Lubrication System
- Starter Motor
- Alternator
- Electric Wiring
- Troubleshooting
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