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Differential filler plug won't tighten very tight. 200 1981

posted by  DougC on  Mon Jan 30 17:07 CST 2006
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last visit: Sun Aug 10 08:30 CST 2014
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After checking the differential fluid, the filler plug doesn't want to tighten very tight. It feels like it just wants to keep on going until the plug falls into the differential pumpkin. I left it before I got that far, but I'm wondering if I should pull the plug out and peen the last couple of threads in two or three places around the circumference of the plug to give it some bite, or maybe just get a new plug. Has this happened to anyone else? The threads are not stripped on the plug or the differential.
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Thanks for all the help. DougC. 1981 242 Brick Off Blocks, Turbo bars and wheels, M46. 1990 245, auto, 113k. 1993 245, M47, 154k.








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Differential filler plug won't tighten very tight. 200 1981

posted by  t-bone on  Wed Feb 1 03:18 CST 2006
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last visit: Tue Sep 21 04:24 CST 2010
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Doug,

I had the same problem with my 86 345DL about ten years ago. I actually had the plug thread through and fall into the dif. After recovering the plug, Teflon tape wrapped around the threads has worked well without any leaks for the last 60k plus miles. I just tighten it to snug before it goes to far.








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Differential filler plug won't tighten very tight. 200 1981

posted by  someone claiming to be 81242DLB21FCA on  Tue Jan 31 16:46 CST 2006 [RELATED]

Could someone have used a straight thread tap to "clean up the threads"?








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Differential filler plug won't tighten very tight. 200 1981

posted by  Michae1 on  Tue Jan 31 12:59 CST 2006
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last visit: Sun Feb 28 08:41 CST 2010
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Teflon tape or paste, and only tighten til barely snug.
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Differential filler plug won't tighten very tight. 200 1981

posted by  mcduck on  Tue Jan 31 02:36 CST 2006
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last visit: Sun Sep 9 11:47 CST 2012
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I'd try a pipe plug from the local home improvement store; it might be larger(the thread is tapered), but I'd use teflon tape, regardless.








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Differential filler plug won't tighten very tight. 200 1981

posted by  someone claiming to be nate on  Mon Jan 30 22:51 CST 2006 [RELATED]

Before peening any threads, how about a couple wraps of teflon tape to snug it up?







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