Ttumachy Posted January 2, 2022 Report Posted January 2, 2022 Sooo close to getting the ‘51 back on the road after full rebuild of the front end. Getting it started after 8-9 years I drained the tank and went to put the plug back in. I really didn’t feel like it was that tight but the plug sheared into two pieces! I’ve got a new seal for it already on order, but I can’t find anywhere that stocks the right bolt that will seal. Does anyone know know where to get the bolt to put back into the fuel tank drain? 1951 Plymouth Cranbrook. For reference, it started up after that 8-9 years with just a new battery, a bit of starter fluid and adding some fuel to the fuel pump screens as they were clogged. Quote
Sniper Posted January 2, 2022 Report Posted January 2, 2022 The factory part number is 1316674, fwiw. I couldn't find a listing Quote
Dodgeb4ya Posted January 2, 2022 Report Posted January 2, 2022 This is what the plug looks like... 1 Quote
Sniper Posted January 2, 2022 Report Posted January 2, 2022 What is the thread count and pitch? With that he might be able to find a drain plug that will work. Quote
Ttumachy Posted January 2, 2022 Author Report Posted January 2, 2022 16 hours ago, Dodgeb4ya said: This is what the plug looks like... Yes sir, that’s exactly like mine. Except, mine is now twisted in two pieces. And I really don’t like the idea of welding it back together but have not been able to find a new one. Quote
Dodgeb4ya Posted January 2, 2022 Report Posted January 2, 2022 Contact...seaplym@hotmail.com Sells 40's 50's Plymouth parts Quote
Plymouthy Adams Posted January 2, 2022 Report Posted January 2, 2022 do you have a tap and die set that has the TPI gauge include....you can gauge the TPI and then OD. Carry that to the local hardware retailer. Or carry what you have remaining and match it up in the store... If I had one out of a tank I would have recorded the size...but never saw a need to pull a drain plug....if a tank needs servicing in this late of its life, odds are you may need to cut an access hole and reweld that. Quote
Dodgeb4ya Posted January 2, 2022 Report Posted January 2, 2022 (edited) Measured threads per inch using a Starrett pitch gauge..20tpi. Outside thread diameter--- .864" What size is it? Edited January 2, 2022 by Dodgeb4ya Quote
Sniper Posted January 2, 2022 Report Posted January 2, 2022 It seems to fall between 7/8 and 3/4 in diameter, assuming no erosion or wear on the major diameter. If I was to pin it down I'd say it's 7/8-20, which I also believe is the drain plug size on the oil pan. Quote
DJ194950 Posted January 3, 2022 Report Posted January 3, 2022 I'd guess same as some auto oil drain plug, but a Guess!! Metric dimensions in reality ?? DJ Quote
Ttumachy Posted January 3, 2022 Author Report Posted January 3, 2022 Thanks everyone, this is a great help. I have a few leads to try tomorrow during business hours and I’ll also make a few runs to the local hardware stores. It’s been a long time since this thing has seen the streets. I’m the gas tank plug and spacers for the front wheels away from driving it! Full disc conversion on the front. Thought it was supposed to work with the rims I have, but that’s not the case so need the spacers to work with the calipers. All sandblasted and powder coated front end components, all new grease fittings, shocks and springs. Sooo close to driving it again! Quote
Dodgeb4ya Posted January 3, 2022 Report Posted January 3, 2022 2 hours ago, DJ194950 said: I'd guess same as some auto oil drain plug, but a Guess!! Metric dimensions in reality ?? DJ 4 hours ago, Sniper said: It seems to fall between 7/8 and 3/4 in diameter, assuming no erosion or wear on the major diameter. If I was to pin it down I'd say it's 7/8-20, which I also believe is the drain plug size on the oil pan. Flathead oil pan drain plug is 7/8" X 14 tpi Quote
oldodge41 Posted January 3, 2022 Report Posted January 3, 2022 UNEF thread, 7/8-20 is my guess. A Google search of 7/8-20 plug will show some possible options. Quote
Sniper Posted January 4, 2022 Report Posted January 4, 2022 On 1/2/2022 at 9:37 PM, Dodgeb4ya said: Flathead oil pan drain plug is 7/8" X 14 tpi Not on my flat head it isn't. Ran into that problem with my first oil change. Bought a Dorman replacement that the threads were way too coarse on. You can see the difference in the picture. Quote
Dodgeb4ya Posted January 4, 2022 Report Posted January 4, 2022 1 hour ago, Sniper said: Not on my flat head it isn't. Ran into that problem with my first oil change. Bought a Dorman replacement that the threads were way too coarse on. You can see the difference in the picture. I have to admit I got that thread spec off the look up your car drain plug 7/8 X 14 tpi off the chinese crap Dorman site. I never actually measured the plug thread...should have. My mistake...will not do that again? 1 Quote
Sniper Posted January 4, 2022 Report Posted January 4, 2022 Not a problem, I ended up buying the plug for the seal, as you can see the copper seal on my original plug was hammer flat. It took everything I had and a cheater pipe to get that plug loose. One of the many hacks I found on this car. I think someone put the impact on it, dialed it up to "hulk smash" and let fly. Trying to get Dorman to fix the issue though... 1 Quote
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