UPDATE II: There are additional updates throughout as several folks suggested other drain holes in various bodies and windshields.
UPDATE: Barney Goodwin noted that MBs/GPWs also have drains on the gas tank sump, front and rear. He also shared some pics (thanks!). Also, some MB/GPW bodies had 3/8″ drain holes in the tool boxes (seem more here).
A couple months ago Chuck asked a question about drain holes, so I collected the information below. It’s hardly exhaustive, so if I’ve missed something, please comment. Also, I did not find any drain strategies for Wagons, Trucks, Jeepsters or FCs; did they have any interior drains? I’m also unsure if the prototype jeeps had drain strategies.
MBs & GPWs:
MBs and GPWs did have drain holes in the far left of the driver side and far right of the passenger side corners, stopped with brass plugs. There seems to be some debate about whether the plugs should have square tops or slotted tops. You can imagine it might not be easy to locate and remove a brass plug once the floor of an MB was full of dirt/mud/water. Here’s a photo of a square plug from G503 in the left corner of the floor:
Arrow points to the drain plug on the driver’s side of this MB.
Fun fact, the drain plug for the floor is reportedly the same size as the drain plug for the MB and GPW gas tank.
Here’s an example of the square plug alternative, a slotted plug. I would think this could be especially difficult to locate when filled with water/mud:
I didn’t know about the fuel tank sump drain holes (of course, on hindsight, it makes sense they’d have them). Barney Goodwin adds, “MB/GPWs had 2 large drains on the fuel tank sump to clear water out, especially after fording. They are basically a radiator cap and gasget without the temp pressure spring. Even the neck on the drain looks like a radiator neck. There was one fore and aft of the sump. It was especially important because there was felt or horsehair insulators between the tank and the body that would be prone to retain moisture and rust the tank if not maintained.”
CJ-2As/CJ-3As/CJ-3Bs/DJ-3As:
These jeeps had drain holes on the sides near the outside step on either side of the body. When purchasing a jeep, If the body is missing the drain hole, then it’s worth examining the body to see if it has been altered in some fashion. Sometimes the lack of drain hole is also a sign that the body is an M-38 or that the body is fiberglass.
Drain hole for CJ-2As, CJ-3As, CJ-3Bs, and DJ-3As.
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