The Yanmar O-Ring (24311-000120 / 1AP12.0) is designed to seal the valve cover knob/nut on Yanmar GM-series marine diesel engines. This O-ring prevents oil leakage from the valve cover and ensures proper sealing during engine operation. Manufactured to OEM specifications, it provides accurate fitment and reliable sealing. Replacement is recommended whenever the valve cover knob is removed during service or maintenance. Product Type O-ring (valve cover knob / nut seal) OEM / Reference Number 24311-000120 1AP12.0 Dimensions Outer size: 17 × 17 mm Thickness: 3 mm Application O-ring for valve cover knob / nut Prevents oil leakage from valve cover Compatibility Suitable for Yanmar engines: GM Series 1GM 1GM10 2GM 2GM20 2GM20 EU 2GM20 F 2GM20 F EU 3GM 3GM30 3GM30 EU 3GM30 F 3GM30 F EU
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