 Oil Galley plugs.. steerl or alum., question for engine guys |
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| MrHyde |
 Mar 19 2012, 01:52 PM
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#1
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Senior Member  Group: Members Posts: 525 Joined: 13-October 10 From: Ontario, Canada Member No.: 12,268 Region Association: None  |
I just dropped my engine case off at the machine shop to get the cylinder registers decked and oil galley plugs pulled and tapped. I Already have the 3/8"npt steel plugs and was asked by the machine shop if there was a special reason for using steel ones over aluminum. He brought up having the two metals expand/contract at same temps., etc. and I had no other response than " that seems to be what everyone uses"... Soooo.. I don't really want to seem like much of a fool, but why is it that we use steel npt galley plugs vs. aluminum ones ????
Thanks a bunch, Mike |
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| aircooledtechguy |
Mar 19 2012, 02:03 PM
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#2
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The Aircooledtech Guy Group: Members Posts: 1,966 Joined: 8-November 08 From: Anacortes, WA Member No.: 9,730 Region Association: Pacific Northwest |
Use the steel ones. The aluminum ones can gall going in and you'll have to drill it out next time.
I also use a good thread sealer like the white Permatex liquid thread sealer; good stuff and I've never had a leak with it. |
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| gothspeed |
Mar 19 2012, 08:00 PM
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#3
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Senior Member Group: Members Posts: 1,539 Joined: 3-February 09 From: SoCal Member No.: 10,019 Region Association: None |
I think mine were anodized aluminum. anodizing hardens the surface slightly and if used with sealant they should screw in just fine. I agree with the CTE argument.
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| Valy |
Mar 20 2012, 01:23 AM
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#4
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Senior Member Group: Members Posts: 1,673 Joined: 6-April 10 From: Sunnyvale, CA Member No.: 11,573 Region Association: Northern California |
How about brass?
It's hard enough and expands/contracts similar to the aluminum. Just my 2 cents. |
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| MrHyde |
Mar 20 2012, 10:52 AM
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#5
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Senior Member Group: Members Posts: 525 Joined: 13-October 10 From: Ontario, Canada Member No.: 12,268 Region Association: None |
Gonna stick with the steel ones... The engine will be far from stock, so I'll beef up what I can.. Thanks all
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| gothspeed |
Mar 20 2012, 04:01 PM
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#6
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Senior Member Group: Members Posts: 1,539 Joined: 3-February 09 From: SoCal Member No.: 10,019 Region Association: None |
I believe the factory interference fit plugs are steel and sometimes fall out and leak ....... but they are not threaded either .......... so you should be fine. (IMG:style_emoticons/default/smile.gif)
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| Jake Raby |
Mar 20 2012, 04:29 PM
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#7
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
QUOTE(gothspeed @ Mar 20 2012, 02:01 PM)  I believe the factory interference fit plugs are steel and sometimes fall out and leak ....... but they are not threaded either .......... so you should be fine. (IMG:style_emoticons/default/smile.gif) No, they are aluminum and have very little interference fit. We ONLY use steel plugs, 16 years later they can be removed with no issue and the galleys cleaned at rebuild.Just a little dab of Milk Of Magnesia on each plug is a good way to ensure they'll never seize. I have had horrible experiences with threaded aluminum plugs that we have removed from "core engines" that had them retrofitted. |
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| MrHyde |
Mar 20 2012, 04:46 PM
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#8
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Senior Member Group: Members Posts: 525 Joined: 13-October 10 From: Ontario, Canada Member No.: 12,268 Region Association: None |
I'm going to try to minimize my exposure to the "horrible experiences"..
I'll stick with the steel ones.. I have them already anyways... Thanks for the Milk of Magnesia tip. ! Cheers |
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| gothspeed |
Mar 20 2012, 09:59 PM
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#9
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Senior Member Group: Members Posts: 1,539 Joined: 3-February 09 From: SoCal Member No.: 10,019 Region Association: None |
QUOTE(MrHyde @ Mar 20 2012, 02:46 PM) I'm going to try to minimize my exposure to the "horrible experiences".. I'll stick with the steel ones.. I have them already anyways... Thanks for the Milk of Magnesia tip. ! Cheers I checked on my new 2056 engine build and the plugs are steel and have yet to leak. so the alloy ones I envisioned at my friends shop, must have been for something else. (IMG:style_emoticons/default/smash.gif) |
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