Series 50 – Section 24.6 Low Compression Pressure

Section 24.6
Low Compression Pressure

To determine if low compression pressure is causing rough running or stalling, perform the following:‪

1. Perform a cylinder compression test; refer to "29.2 Cylinder Compression Test" .
2. Compare cylinder compression test results to specifications.
   1. If cylinder pressure is within specifications (listed in Table "Compression Pressures at Various Altitudes" , refer to "29.2 Cylinder Compression Test" ), call Detroit Diesel Technical Service Group.
   2. If cylinder pressure is below specifications (listed in Table "Compression Pressures at Various Altitudes" , refer to "29.2 Cylinder Compression Test" ), refer to "24.6.1 Low Compression Repair" .

Section 24.6.1
Low Compression Repair

Perform the following steps for low compression repair:‪

1. Perform low compression repair; refer to "17.13.1 Low Compression Repair" .
2. Verify cylinder head valve and cylinder kit repair; refer to "24.6.1.1 Test Engine with Repaired Cylinder Head Valve(s), and Cylinder Kit" .

Section 24.6.1.1
Test Engine with Repaired Cylinder Head Valve(s), and Cylinder Kit

Perform the following steps to determine if the cylinder head valve and cylinder kit repair resolved starting difficulty:‪

1. Start and run the engine.
2. Run the engine through its operating range with no-load for approximately 5 minutes, allowing the engine coolant to reach normal operating range, 88-96°C (190-210°F).
   1. If the engine is not running rough or stalling, no further troubleshooting is required. Shut the engine down.
   2. If the engine is running rough or stalling, shut the engine down. Call Detroit Diesel Technical Service Group.