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Gerard
07-10-2013, 05:59 PM
I was just about to fire up a 1275 I've completely rebuilt and while cranking to get oil pressure, discovered that the front oil gallery plug is leaking profusely. The machine shop installed new ones. I had a feeling I should have just left the old ones, but you can't really get the block clean without pulling them. This has never happened to me before. Anyway, I have this thing all set up on a test stand and don't want to completely disassemble things and haul it back to the shop, so I'm wondering, since it's accessible without taking anything apart, if there is anything that be done to stake this one better. If not, my other thought is to yank it out and thread the hole for a pipe plug. I can't locate the two I pulled out of another block I have, so I'm wondering if anyone can give me the correct size I need to do this.

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bug_sixty
07-10-2013, 06:53 PM
Well, here's what I found on mine....the U and L gasket set with the black head gasket didn't include that copper O ring....I had to buy it from a place that sells such... They didn't the the water ring either....Who knows what improvising was done in your assembly. sorry don't know the size

bug_sixty
07-10-2013, 06:59 PM
I met the collapsible copper ring....one and only that does the trick 80lb of pressure....

Gerard
07-10-2013, 07:08 PM
I met the collapsible copper ring....one and only that does the trick 80lb of pressure....


Are you referring to the head gasket? I'm talking about the oil gallery plug at the front of the block, just below the water pump. (see 2nd pic)

The originals are a thick brass plug, but what you get today is a metal cap, similar to the water jacket freeze plugs.

Trevor Jessie
07-10-2013, 07:11 PM
I do not know the size, but wouldn't tapping it create a risk of metal swarf in the oil.

bug_sixty
07-10-2013, 07:20 PM
No..I'm referring to the oil galley plug....the sealing washer!

bug_sixty
07-10-2013, 07:23 PM
Also, someone out there has the real deal plug in there spare bolt jar.... I would wait and getter right....

Gerard
07-10-2013, 07:25 PM
I do not know the size, but wouldn't tapping it create a risk of metal swarf in the oil.


Yeah, there's that, but with some grease on the tap and the fact the the hole is horizontal, it would be pretty easy to clean out with a magnet and a couple Q-tips. I'm tempted to see if I can knock this in a little farther and see if I can stake the edges first. I'm just not sure if that's a secure solution. Another option is to remove this one and see if I can find some brass bar stock that would be a press fit.

BlueMax
07-10-2013, 07:26 PM
Sorry for your trouble, I never use a replacement plug after block hot tanked. I tap all oil galleries 1/2-18 and JB-weld in place after hot tanked.

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Gerard
07-10-2013, 07:27 PM
Also, someone out there has the real deal plug in there spare bolt jar.... I would wait and getter right....

If someone does or have a source for one, I'd like to know.

Gerard
07-10-2013, 07:39 PM
So you are using a straight coarse thread rather than a pipe thread. I have one race engine done this way, but I will probably do threaded plugs in all future builds.

Dug
07-10-2013, 09:59 PM
Gerard, you have a PM....

Hap Waldrop
07-17-2013, 08:55 AM
I put 1/4 NPT pipe pipe plugs in every MG engine I build instead of the brass plugs, but i don't think I would do this now in a built engine, the oil galley is no palce you want to have any metal shaving in, it's a direct feed to the crank bearings. I would repalce the plug, or use a steel type core plug.

Alan, I think you meant 1/4" NPT.