Topic: Mystery hole in oil pan


ole_Bill    -- 02-14-2011 @ 2:23 PM
  Can anyone tell me what goes in the threaded hole below the oil dipstick tube in this picture? The pan fits a 59 block.


supereal    -- 02-14-2011 @ 2:48 PM
  No mystery there, Bill. That is a return for an oil filter. Some dipstick bosses alread have the pipe threads for a fitting, while others must either be replaced, or a separate boss installed to accomodate the return line. Most 59A pans have the former.


ole_Bill    -- 02-15-2011 @ 8:54 AM
  Since I plan no oil filter I assume this hole may be plugged. Do I use a sealent like thread tape or maybe gasket sealent on the plug?


supereal    -- 02-15-2011 @ 11:05 AM
  Usually those holes are pipe threaded, and need no sealer. The oil there is not under pressure. If the plug tightens down, I wouldn't put anything on it. At our shop, we don't use Teflon tape. It has a nasty habit of clooging vital areas if any of the tape breaks off. We do use some Permatex if any is required.


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