The O.S. Engine OS28151300 crankcase plug is specified for the GT15HZ line as a replacement component for RC glow-engine crankcases. It provides a protective closure to keep internals safe during operation and when the engine is being serviced.
To install: remove the prior plug, check the seating area and any gasket or O-ring, clean away contamination, then fit the replacement into the crankcase bore. Start threading manually until the plug seats, avoid excessive force, and confirm the crankcase is leak-free before finishing reassembly.
Maintaining a correct crankcase seal is important for preserving internal pressure and preventing ingress of debris, which helps sustain reliable carburetor and ignition behavior. Use this plug whenever you open the crankcase for inspection or parts replacement, and verify sealing after maintenance.
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