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wrist pin
If you have a bad wrist pin the test is to disconnect the spark plug wire. If the noise does not go away it is a wrist pin. If it goes away it is a bearing. Although the engine was rebuilt it is either sludged up or not broken in properly. Before I would go on another overhaul I would run thin oil with Marvel Mystery Oil and try to create a lot of splash internally in the engine to free up the piston pin. Oil pressure is only half the story. Splash is what lubricates the wrist pins,piston rings,camshaft surfaces and timing chains.
If you have a bad wrist pin the test is to disconnect the spark plug wire. If the noise does not go away it is a wrist pin. If it goes away it is a bearing. Although the engine was rebuilt it is either sludged up or not broken in properly. Before I would go on another overhaul I would run thin oil with Marvel Mystery Oil and try to create a lot of splash internally in the engine to free up the piston pin. Oil pressure is only half the story. Splash is what lubricates the wrist pins,piston rings,camshaft surfaces and timing chains.
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