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FE Power Forums => FE Technical Forum => Topic started by: 482supersnake on August 23, 2023, 02:27:11 PM

Title: 1/4 oil galley plug.
Post by: 482supersnake on August 23, 2023, 02:27:11 PM

Does anyone have source for the thin 1/4 threaded oil plug for behind the distributor? I check a couple of local sources and they don't have a thin one.

Thanks.
Scott.

Title: Re: 1/4 oil galley plug.
Post by: Urgefor on August 23, 2023, 02:44:33 PM

The one that I used pictured in this thread (https://fepower.net/simplemachinesforum/index.php?topic=11719.0) was one from the set that Precision Oil Pumps sells.  It's length wasn't any different than the others in the set and fit just fine.

Title: Re: 1/4 oil galley plug.
Post by: blykins on August 23, 2023, 02:45:20 PM

Pioneer PP-567 is a short one.

Title: Re: 1/4 oil galley plug.
Post by: 482supersnake on August 23, 2023, 06:54:10 PM

Thanks, I'll see if it works.

Title: Re: 1/4 oil galley plug.
Post by: Nightmist66 on August 23, 2023, 09:43:11 PM

As mentioned, you don't need a shorter plug to fit that location. I have been using these from McMaster Carr. This one is a typical 1/4" NPT plug and is .440" thick- https://www.mcmaster.com/6367N14

I also like their "extreme pressure" plugs like this one- https://www.mcmaster.com/4534K42 It is .410" thick and NPTF, but it sits 2-3 threads further in than the other plugs do. So if you have a hole already tapped and/or you can't tap any deeper(shallow hole) and a traditional plug sits 2-3 threads above the surface, this one will sit flush or just below. Just be sure it doesn't go too deep and block any passage behind it.

Title: Re: 1/4 oil galley plug.
Post by: blykins on August 24, 2023, 04:37:14 AM

It just depends on the block.   I have to keep an assortment of plugs because every block is different.   When we tap factory blocks, we have control over how deep we go, but aftermarket blocks are a different story.   BBM's are usually tapped too deep so we have to use a longer plug, Ponds are usually tapped too shallow there behind the distributor, so we either have to use a short plug or tap it some more. 

Title: Re: 1/4 oil galley plug.
Post by: 482supersnake on August 24, 2023, 09:33:16 AM

The stock plug is .261 thick. The PP-567 is .375 thick. I tried a .440 thick replacement and it sticks out way too far. I have some .375's on order and a longer tap just in case in need too tap the hole a little more.

Title: Re: 1/4 oil galley plug.
Post by: frnkeore on August 24, 2023, 12:04:35 PM

The type of short plug your looking for, is called a "dry seal".

If you want the plugs to fit properly and always be the right depth,you need a thread gauge. It's a hardened gauge, that has a flat on it, that involves 3 threads. The thread is the right depth, if it threads in to the middle of those thread but, will be in tolerance, if it align with any of the 3 threads.

So the tolerance for all pipe threads (at least under 1"), is nominal, +/- one thread.

I hope that helps.