1299726 ENGINE AR-COMPLETE Caterpillar parts
3406E
Rating:
Alternative (cross code) number:
CA1299726
129-9726
1299726
CA1299726
129-9726
1299726
TRUCK ENGINE,
Compatible equipment models: 1299726:
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Information:
* HARD STARTING ALL THE TIME
To start properly in normal ambient temperatures, these engines must have good compression, good cranking speed, and adequate fuel.
COMPRESSION: If the engine runs good after starting, without excess blow by (see the Reference Article) and without excess oil consumption [more than 1 liter oil per 240 liter fuel (1 quart oil per 60 gallons fuel)], the compression is probably acceptable.
CRANKING SPEED: The cranking system (starter, battery, wiring) should be sized to provide 140 rpm minimum cranking speed under normal parasitic loads and ambient temperatures for the application. The cranking system (starter, battery, wiring) should be sized to provide 100 rpm minimum cranking speed at the worst case conditions that the engine will encounter.
- Check wiring, increase battery size, use heavy duty starter, decrease parasitic loads.
FUEL: Insufficient fuel to start is normally evident by no smoke in the exhaust or no intermittent firing during cranking.
- Install a rack indicator on the number 1 injector and measure cranking rack. If the engine does NOT have a Fuel Ratio Control (FRC), the minimum cranking rack should be the same as the full load rack value on the information plate. If the engine HAS a FRC, the minimum cranking rack should be 5.5 mm (.22 in) or more (can be calculated by subtracting FRC setting found in Performance Specification in the TMI from Full Load Static Fuel setting shown on valve cover information plate). Repair mis-set FRC, sticky control linkage, sticky injector rack, defective shutoff solenoid, or defective governor to obtain minimum cranking rack.
- With a clean fuel filter installed, check the fuel pressure with engine running at low idle and high idle. If the fuel pressure is less than 50 kPa (7.2 psi) at low idle or 200 kPa (29 psi) at high idle, repair the fuel transfer pump. Normal cranking pressure is 7 to 34 kPa (1 to 5 psi).
- Install a sight glass in the fuel return line to check for combustion gas leakage at high idle. One small gas bubble every 2 to 3 seconds or a fine stream of bubbles in the center of the glass is normal. If the fuel is milky, foamy, or contains an excessive number of bubbles, identify the defective cylinder. Ream or replace injector sleeves as required to get a smooth seat for the injector cone. Also, inspect injector cone sealing edge for damage or wear. Reinstall good injectors with new seals, or replace defective injector.
- Also see: * HARD STARTING ONLY IN COLD AMBIENT TEMPERATURES* HARD STARTING ONLY AFTER AN EXTENDED SHUTDOWN PERIOD* HARD STARTING ONLY AFTER A HOT SHUTDOWN
* HARD STARTING ONLY IN COLD AMBIENT TEMPERATURES
With a 140 rpm cranking speed, a good cold weather fuel, and no engine driven parasitic loads, these engines should start under the following conditions:
- As cranking rpm decreases the engine will be harder to start and may not start at all below 100 rpm. Use proper oil viscosity for the operating temperature, check wiring, increase battery size, use heavy
To start properly in normal ambient temperatures, these engines must have good compression, good cranking speed, and adequate fuel.
COMPRESSION: If the engine runs good after starting, without excess blow by (see the Reference Article) and without excess oil consumption [more than 1 liter oil per 240 liter fuel (1 quart oil per 60 gallons fuel)], the compression is probably acceptable.
CRANKING SPEED: The cranking system (starter, battery, wiring) should be sized to provide 140 rpm minimum cranking speed under normal parasitic loads and ambient temperatures for the application. The cranking system (starter, battery, wiring) should be sized to provide 100 rpm minimum cranking speed at the worst case conditions that the engine will encounter.
- Check wiring, increase battery size, use heavy duty starter, decrease parasitic loads.
FUEL: Insufficient fuel to start is normally evident by no smoke in the exhaust or no intermittent firing during cranking.
- Install a rack indicator on the number 1 injector and measure cranking rack. If the engine does NOT have a Fuel Ratio Control (FRC), the minimum cranking rack should be the same as the full load rack value on the information plate. If the engine HAS a FRC, the minimum cranking rack should be 5.5 mm (.22 in) or more (can be calculated by subtracting FRC setting found in Performance Specification in the TMI from Full Load Static Fuel setting shown on valve cover information plate). Repair mis-set FRC, sticky control linkage, sticky injector rack, defective shutoff solenoid, or defective governor to obtain minimum cranking rack.
- With a clean fuel filter installed, check the fuel pressure with engine running at low idle and high idle. If the fuel pressure is less than 50 kPa (7.2 psi) at low idle or 200 kPa (29 psi) at high idle, repair the fuel transfer pump. Normal cranking pressure is 7 to 34 kPa (1 to 5 psi).
- Install a sight glass in the fuel return line to check for combustion gas leakage at high idle. One small gas bubble every 2 to 3 seconds or a fine stream of bubbles in the center of the glass is normal. If the fuel is milky, foamy, or contains an excessive number of bubbles, identify the defective cylinder. Ream or replace injector sleeves as required to get a smooth seat for the injector cone. Also, inspect injector cone sealing edge for damage or wear. Reinstall good injectors with new seals, or replace defective injector.
- Also see: * HARD STARTING ONLY IN COLD AMBIENT TEMPERATURES* HARD STARTING ONLY AFTER AN EXTENDED SHUTDOWN PERIOD* HARD STARTING ONLY AFTER A HOT SHUTDOWN
* HARD STARTING ONLY IN COLD AMBIENT TEMPERATURES
With a 140 rpm cranking speed, a good cold weather fuel, and no engine driven parasitic loads, these engines should start under the following conditions:
- As cranking rpm decreases the engine will be harder to start and may not start at all below 100 rpm. Use proper oil viscosity for the operating temperature, check wiring, increase battery size, use heavy