You suspect that a diesel generator set on your general-purpose offshore supply vessel has a defective unit injector because the engine, although warm, is running roughly. The two-stroke engine is fitted with mechanically operated unit injectors. When you push and hold down the #3 cylinder injector follower, there is no real change, as the engine continues to run roughly as before. What does this indicate?
• How mechanically operated unit injectors on a two-stroke diesel are actuated by the cam and follower • What happens to engine operation when you disable fuel to a cylinder that is already not contributing power • How mechanics isolate a bad cylinder on a multi-cylinder diesel by changing one thing at a time
• If you push and hold down the injector follower on #3, what are you effectively doing to that cylinder’s fuel injection? • On a healthy cylinder, what should happen to overall engine smoothness and RPM when you suddenly stop that cylinder from getting fuel? • If there is no noticeable change when you disable #3, what does that tell you about how much #3 was contributing before you touched it?
• Be clear on what it means, mechanically, to hold an injector follower down during operation • Consider what you would feel or hear on a good cylinder versus a dead/faulty cylinder when you cut off its fuel • Before choosing, ask: does this situation suggest that #3 is doing its job or already not contributing to engine power?
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