Question 48Motor Plants - 1st Asst/Chief70% to pass
The service life of a worn aluminum piston for an auxiliary diesel, for which no spares are readily available, can be extended by_______________.
AI Explanation
The correct answer is A) knurling the piston skirt surface.
Knurling the piston skirt surface can help extend the service life of a worn aluminum piston for an auxiliary diesel engine when no replacement parts are readily available. Knurling creates a rough, textured surface that increases the friction between the piston and the cylinder wall, improving the piston's sealing and reducing wear.
The other options are not suitable for extending the service life of the piston. Increasing the dimensions of the ring land grooves (B) would not address the wear on the piston skirt. Building up the piston skirt with a liquid epoxy material and then remachining (C) may temporarily fix the issue but is not a long-term solution. Turning down the piston skirt to concentric values (D) would reduce the piston's diameter, potentially leading to poor engine performance and further wear.
Related Questions
#46 Before any auxiliary diesel engine hydraulic starting system is opened for servicing or repair, you must _______________.#47 In an auxiliary diesel engine, one reason for knurling the piston skirt is to_______________.#49 A four-stroke cycle auxiliary diesel engine fuel cam has shifted from its original position during maintenance. To ensure correct timing of the fuel pump, the intake and exhaust valves should be in what position when approaching top dead center for injection? #50 The cylinders labeled "B" and "C" in the illustration are used to_______________. Illustration MO-0125 #51 The component labeled "A" on the engine reversing device shown in the illustration, performs its function by transmitting. Illustration MO-0125