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Built 4t65e - The results are in.



Re: Built 4t65e - Almost done...

Got my generic HeliCoil kit today. Surprisingly fast considering it came all the way from the U.K.

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And it's the correct one!

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Looks like I will not be needing to pre-drill

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Hole before tap

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And after

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HeliCoil in. She's a bit long.

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Instructions say to "break off the tang." Not sure that's going to cut it.

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A little Dremel action to cut through one of the coils

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Plug goes in without any issues

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There's even enough leftover in this coil to do another pan

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Magnet layout

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This should be good to hold them

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And they're in

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Going to let it cure overnight, then toss the pan on tomorrow
 
Re: Built 4t65e - Almost done...

I like everything I see lol. Might be a dumb question, but how does the coil stay in the pan without un-threading when you remove the drain bolt?
 


Re: Built 4t65e - Almost done...

02NavyBlue said:
Might be a dumb question, but how does the coil stay in the pan without un-threading when you remove the drain bolt?
Click to expand...

Not a dumb question at all. It's one of those things that, if you see it, you inherently "get" what's going on. It's a little harder to describe in words... But I'll try.

The raw coil (before installation) is actually larger (diameter) and has a finer pitch than after installation. When you screw the coil in (from the bottom using the tang) it shrinks the diameter and pulls the pitch. You can feel it kind of springing its way in as you twist. Once you quit twisting, the coil relaxes and binds itself in the hole. It's kind if like a Chinese finger trap wrapped around a cylinder. It will never unscrew (in theory) because whatever force is acting to unscrew the coil is actually binding it harder into the hole.

Did that make sense?
 
Re: Built 4t65e - Almost done...

Ah I see, yeah because it's condensed when its new, and must be larger if it's going to spread apart and fit into the tapped threads(and shrink in diameter at the same time). As it sits, there is pressure as the coil wants to return to how it was before it was installed. Neat
 
Re: Built 4t65e - No short cuts

I've heard of putting a small amount of JB Weld on the outside of the helicoil before installation in places like that where theres fluid behind the threads. To tip the odds in favor of no seepage. Then tap or thread chaser after its hardened. In this case, the plug gasket should stop anything that gets past, and theres no pressure on the fluid. Just thought I'd toss that in, has nothing to do with holding the threaded insert in place. I did the carb mount holes in my V8 intake way back when, and yep the coils are to be trimmed to length. Dremel beats wire cutters for that! Snapping off just the tang is what to do when you can use the whole thing.
 


Re: Built 4t65e - Almost done...

I figured it wouldn't take much

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and it didn't

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Looks like my hardware store drain plug washer setup isn't going to cut it. I guess it's better to know now, versus after it's installed with 10+ quarts sitting on top of that plug. I'll see what O'reilly has today after work.
 
Re: Built 4t65e - Almost done...

Turbocharged400sbc said:
get rid of the copper and go with nylon or Teflon
Click to expand...

Fivefingerdeathpunch said:
I like the metal gasket with a rubber ring around them, they always work great on oil drain plugs.
Click to expand...

The one on the right is what's in there right now.

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I'm thinking the rubber sealing portion isn't large enough to cover the oversized Helicoiled hole. James, something like this?

http://www.oreillyauto.com/site/c/detail/DAG0/66303.oap?year=1992&make=Mercedes-Benz&model=300SE&vi=1382004&ck=Search_66303_1382004_3621&keyword=66303

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Re: Built 4t65e - Almost done...

I bet that is exactly the issue, those gaskets are pretty nice when they are used stock

Sent from my HTC One_M8 using Tapatalk
 


Re: Built 4t65e - Almost done...

these pans aren't strong enough to work without a helicoil.
yeah either the blue ribbed nylon or I just use the white nylon from the plug section at any parts store, or you can order teflon washers from McMaster
 
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