After purchasing our 51 3100 1/2 ton a couple of weeks ago I decided to do a fresh oil change. The motor is an upgraded 253 from a mid 50's sedan. What has got me perplexed is the contraption at the drain plug and I am wondering if anybody has seen this before? Clearly aftermarket. Its not a petcock. if I remove the screw it is not threaded all the way into the drainplug. Then you can see the adaptor as well. Is this some type of anti back out device? the center drain plug has an o ring on it and not a gasket. Curious what you all think.
That appears to be a repair kit for a damaged thread in the oil pan. The big plug probably has an oversized, self-tapping thread and the middle plug is then used to drain the oil. The bracket that's held on by the screw is a safety device to prevent the plug from getting loose and backing out. The inventor of that device was probably a gentleman named Goldberg! Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
Did you post this picture in another thread? If not, then someone else on here has the same oddball thing.
Is the first, smaller nut the drain plug? Is the large nut against the pan fixed in position?
1950 Chevrolet 3100 (Ol' Roy) 1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1956 Cadillac Sixty Special Fleetwood (The Godfather) | 1966 Oldsmobile Toronado (The Purple Knif) | 1966 Ford Mustang (Little Red) | 1964 Ford Galaxie 500 coupe | 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
Clearly German engineered. When hiring engineers from the Old Country (my people refer to us as such), it is always advisable to hire two of them. One to come up with all of the ideas, and the other one to tell him when to stop engineering. Since the threads for the part which uses the o-ring can only be tightened enough to compress the o-ring, but not tight enough to prevent it from backing out from vibration, an additional device was required to prevent that. All and all, I'd say that Otto stopped Hans from 'engineering' this device too far. But given my ethnicity, I may be biased.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
I did post a picture of it in the "what did you do today" section after I spoke about what all I did to the truck that day on the truck but the posting was taken down. I apologized for not staying on topic with "what did you do today" Basically I said I found this odd ball plug..... Anyway, I have not attempted to take out the larger hex head against the pan. I loosened the smaller one saw the o-ring and figured that would be the drain, which it was. Just have never seen that type of "safety" contraption
