Question 488Motor Plants - Assistant Engineer

The correct answer is A) Check the pump rack setting. If one cylinder's pyrometer is reading significantly higher than the others, this indicates an issue with that cylinder's fuel delivery. The first step should be to check the pump rack setting, as this controls the amount of fuel injected into each cylinder. An issue with the pump rack setting could be causing uneven fuel distribution, leading to the observed temperature discrepancy. The other options are not the correct first step. Checking for exhaust blockage (B), replacing the fuel injector nozzle (C), or examining the exhaust valves (D) are all potential troubleshooting steps, but they should not be the immediate first action. Checking the pump rack setting is the most logical and direct way to address the issue indicated by the uneven pyrometer readings.