Re: Screws behind bell housing?

Posted by HH56 On 2023/6/6 15:49:15

Without seeing more of the side of the engine I cannot tell specifically on that item but it may not be a screw but rather a plug at the end of a longitudinally bored oil passage. The main oil supply gallery out of the oil pump is a passage near there and the end of the valve lifter oil gallery is a few inches above the main gallery but inward just below the valve chamber covers. Some engines close the passages with threaded plugs, some use disc like Welch plugs or in others, press in cup shaped plugs. If you are referring to the large diameter plug like object that could be the closure at the end of the camshaft.

This side view of the engine shows the main gallery depicted by the red line. Gallery is a rounded protuberance on the side of the block and if the plug lines up then you have the answer. While some are hidden, you can easily tell a 5 vs 9 main engine from the outside by looking at the spacing or number of 1/8 pipe plugs visible on the side of the gallery. There is a plug threaded in to close the end of a drilled passages going transversely from the gallery to each bearing.

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