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▷▷ 2021 ▷ Torque specifications for a Cat 3406 engine

4 julio, 2021

torque specifications 3406 cat engine

by Anne Davis

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The Caterpillar 3406 engine has regular scheduled maintenance that you must perform to keep it in good working order. Much of this maintenance that requires specific torque applications, such as removing the injector, must occur at 100,000 miles or 2,000 hours of service. Caterpillar engine classifications are 3406, 3406B, 3406C, or 3406E. Each engine has a unique purpose and unique maintenance requirements.

Horsepower and torque

Depending on its specifications, the 3406 engine can produce between 250 horsepower at 1,600 rpm and 550 horsepower at 2,100 rpm. It can produce between 1,000 foot-pounds of torque at 1,200 rpm and 1,850 foot-pounds of torque at 1,200 rpm. In this context, torque refers to the total amount of work that the 3406 engine can do, while power is a speed-based measure of how fast the engine can do that work.

Bridge tightening torque

Every 100,000 miles or 2,000 hours of service, your 3406 engine will require a jumper adjustment. This maintenance should be performed only after the valves have been reground or any other overhaul of the cylinder head has been completed. After completing the necessary steps, you should hold the adjusting screw in position and tighten the component locknut to 22 foot-pounds of torque.

Injector torque

When removing, cleaning, and reinstalling the fuel injector, which should occur every 100,000 miles or 2,000 service hours, you must tighten the retaining nuts to 55 foot-pounds of torque. Over or under tightening of these nuts could cause fuel nozzle or engine failure.


You can identify your engine and its specific requirements by its serial number. These numbers indicate the size of the engine and specific details. For example, a 2EK serial number indicates that the engine is a 3406B engine and a 5KJ serial number indicates a 3406C engine. Check your engine serial numbers with your maintenance manual to make sure the torque specifications that follow are correct for your engine.

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