During the initial full fluid service of my newly purchased HZJ74 RHD, the front differential drain plug was found stripped and freely rotating in both directions.
A simple extraction tool was fabricated to both rotate and apply axial pulling force to the plug. The tool was made using M8 class 10.9 bolts and a steel plate.
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To ensure proper weld penetration, the drain plug surface was cleaned thoroughly. A tall nut was selected and machined slightly into a tapered profile to create space for a proper weld bead. The nut was then welded to the drain plug using a basic flux-core welding machine.
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The custom puller was bolted to the welded nut, and combined rotational torque with axial force was applied.
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After approximately two hours of preparation, the drain plug was successfully removed.
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Might be helpful for the DIY hobby. Cheap and relatively easy