View single post by Mark Rosenbaum
 Posted: 06-06-2005 04:44 pm
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Mark Rosenbaum



Joined: 03-12-2005
Location: Kingman, Arizona USA
Posts: 532
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 The 4-speed's fill plug and drain plug are the same part. This plug has a 1/2"-14 straight cut pipe thread, and has a rebated section just under the head for a copper crush washer. This refinement isn't really necessary for the fill plug but I suppose it was simpler to use the same plug in both locations.  The oil sump drain plug has a number of differences, but uses the same thread, and would be a satisfactory substitute in either location, though I don't know if the reverse would be true.

In any event, Delta should have these plugs in stock.  If not, or if you need a fill plug immediately, try your local auto parts store -- Chrysler Corp. US has used a similar plug since at least the early 1950s -- or get a 1/2" pipe plug from the local hardware store. However, there is a difference in thread profiles between US and British pipe standards.  Since I'm not sure which is used on the JH, I'd opt for a brass or even plastic plug in case the threads had to deform when installed.

If all else fails, and the car really must be moved under its own power, you can use a suitably sized rubber stopper, bottle cork, or whittled wooden bung as a field expedient.  I wouldn't use any of these as a permanent fix, of course.