RTV bead size on t case halves. Leaky nv271 - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 05-01-2019, 05:40 AM   #1 (permalink)
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RTV bead size on t case halves. Leaky nv271

Iím afraid I didnít use enough and or wait long enough before torquing. Iíve had a tiny weep since i rebuilt it last year and would like to fix it while I have it down for some other work underneath.

I was just afraid of having too much squeeze over into the case. Pretty sure I did like an 1/8Ē. How wide of a bead do you guys normally use when a gasket is not used? Maybe I tightened more than finger tight before it set up?

Kind of embarrassing to rebuild a whole trans and t case myself only to fail at sealing the damn thing. I donít have a good shot of the leak but the second photo shows a bit of the squeeze out in the rear shaft cover. Iím thinking my problem is not letting it set up.





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Old 05-01-2019, 05:43 AM   #2 (permalink)
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I do a .25” bead all the way around and then smear it flat. Also let it set up for as long as you can before filling with oil.
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Old 05-01-2019, 06:52 AM   #3 (permalink)
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use loctite 518. It works wonders on stiff flanges like that. It won't set until you put it together since it cures in the absense of oxygen, which gives you plenty of time to assemble things. Also, it can resist the oil in it's uncured state and that won't affect the cure at all, so you can immediately fill the component with oil. It doesn't glue the halves together so you can get it apart with less damage in the future. It allows for metal to metal contact so the joint can resist loading better, since it only fills in the low spots. Works great for 14b style axle flanges where bolt loosening can occur for this reason.

Downsides are you need a rigid flange to make it work well. No sheet metal covers. Also, you need to make sure the component doesn't need the gasket thickness as a shim for bearing preloads. Your nv271 does not use a gasket anyway.
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Old 05-01-2019, 08:44 AM   #4 (permalink)
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RTV bead size on t case halves. Leaky nv271

Yea no preload to worry about. It just the two aluminum surfaces.

Most shops I spoke with and got parts from use permatex ultra black



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Old 05-01-2019, 09:07 AM   #5 (permalink)
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Yea no preload to worry about. It just the two aluminum surfaces.

Most shops I spoke with and got parts from use permatex ultra black



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Ive had great luck with that.
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Old 05-01-2019, 10:03 AM   #6 (permalink)
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Ive used permatex aviation (or whatever is suggested these days)

If it can keep VW case halves from leaking, itll work for a transfercase.
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Old 05-01-2019, 11:04 AM   #7 (permalink)
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Ive used permatex aviation (or whatever is suggested these days)

If it can keep VW case halves from leaking, itll work for a transfercase.
Just wait till you try and seal one of them 300's
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Old 05-05-2019, 04:19 PM   #8 (permalink)
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This how I usually put on the RTV. I put a generous amount on .25Ē thick or so then smear it semi flat with my finger then if you can put it together just to where the 2 pieces touch but donít tighten together yet. If you can wait a couple hours or over night for the RTV sets up then tighten so it doesnít all squeeze out and will create a good sealName:  852FF5D6-FC42-4A9B-8644-5F5B2970E0F4.jpg
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Old 05-07-2019, 10:43 AM   #9 (permalink)
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This how I usually put on the RTV. I put a generous amount on .25Ē thick or so then smear it semi flat with my finger then if you can put it together just to where the 2 pieces touch but donít tighten together yet. If you can wait a couple hours or over night for the RTV sets up then tighten so it doesnít all squeeze out and will create a good sealAttachment 2929896


Thanks I appreciate that. I think Iíve always just tightened it down too quickly


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Old 05-08-2019, 11:52 AM   #10 (permalink)
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The Right Stuff. Tighten and fill, no waiting.



The only downside is it's great glue- opening stuff up later can be a challenge.
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Old 05-12-2019, 02:11 AM   #11 (permalink)
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Right stuff or the international brand gasket maker stuff if you can find it. 1/4" all around and around the holes and schmeer flatish with your finger. Throw it togeather finger snug and finish tightening the next day.

If you use the international stuff you can do it however you want and it wont leak.... getting it back apart though will be a challenge
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Old 05-12-2019, 03:56 AM   #12 (permalink)
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