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Hello everyone, I'm currently reassembling a 400ex engine. Full Rebuild. And came across this little guy lodged in the oil port (from oil filter to oil pump) I've build many engines and have never seen this plug in an engine before. So I thought I'd reach out for help. It was blocking probably 80% of the passage. Most likely main cause of engine failure. I'd like to know if anyone has ever came across this part before, It's a solid black rubber plug with what looks like a o-ring shape around the top, but still solid. It was lodged in the oil port so I figure it belongs somewhere in the engine but don't know where. Any help is apricated. Thanks.
 

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I have found this piece of rubber in engines that I have rebuilt and it it not a part of the engine assembly - I have concluded that it is only found in engines that were previously worked on and the monkey working on it used RTV as a sealant. It may be a plug of RTV that was pressed into an oil passage and oil pressure flushed it from a gallery to the oil filter cavity. NOTE: the oil pump picks up oil from the crankcase sump and the oil tank feed - it it then pumped through a gallery in the clutch cover to the oil filter - from the filter cavity, the oil passes through the filter and then makes it's way to the crankshaft, camshaft and transmission before collecting in the sump and then the process is continuous.
 
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