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Old 08-31-2019, 06:01 PM
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Default Stripping

Now that I have everyone’s attention...lol...

Has anyone stripped their oil drain hole?

The oil plug went in fine during the last oil change, but for some reason, when I removed it today, it came out at a slight angle and took out a bunch of threads with it. I had to dig out scraps of metal from inside the drain hole area.

Even though I torqued it at the recommended 45 N-m during the last oil change, I suspect that value is too high. I’m used to torquing oil plugs at 25 ft-lbs, so that’s what I’m going to do from now on.

Anyhoo, has anyone been through this before? What is the thread size and is there a longer plug available anywhere? I suspect that that with many threads now gone, I’ll only grab one or two threads with what’s remaining and am concerned about torquing on only a couple of threads and making matters worse.

Thanks, Drew
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Last edited by Drew Zee; 08-31-2019 at 06:07 PM.
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Old 08-31-2019, 06:09 PM
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you will need to get it repaired, can be done with a "Helicoil"

basically drilled / tapped to a bigger size, and a new threaded insert installed...

I would not risk just using a longer plug, if it fails and you drop oil... could destroy your motor.
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Old 08-31-2019, 06:27 PM
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Thanks. Does the pan need to come out, or can it be done in place?
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Old 08-31-2019, 06:46 PM
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yeah Id say the pan will most likely need to come out to make sure no metal gets into the engine.
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Old 08-31-2019, 06:56 PM
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Nicely done I agree that you need to repair it. A Helicoil should work but I wouldn't chance trying to do it without removing the sump. There will be metal shavings that get into the sump from the drilling and tapping operation. You might be tempted to flush the debris out but that's risky business and not worth it in my opinion.

Steve
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Old 08-31-2019, 09:26 PM
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Ouch, this is hard to look at.

It looks as though you may want to have the face planed as well, looks messed up where the copper crush washer faces up to?

I never torque aluminum plugs, I don't trust aluminum and always use a normal length 3/8 ratchet tightening by feel.
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Old 09-01-2019, 12:34 AM
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Quote:
Originally Posted by iownedu View Post
Ouch, this is hard to look at.

It looks as though you may want to have the face planed as well, looks messed up where the copper crush washer faces up to?

I never torque aluminum plugs, I don't trust aluminum and always use a normal length 3/8 ratchet tightening by feel.
So I wonder why the specs call out the massive 45 N-m torque?

I looked at it again and still have 4-5 untouched threads left in the pan. Did a search and found a 14X1.5 Dorman plug that has 11 threads, at double the OEM length (0.93” long). I’ll be able to engage just as many threads as the OEM plug (4). The metal pieces from the oil pan were all external and came out when the plug came out.
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Old 09-01-2019, 03:13 AM
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Damn I hate it when stuff like that happens. When you repair the oil pan I would suggest adding Fumoto drain valves. No worry about stripping the pan when done and oil changes are much easier. I changed out my drain plugs on my first oil change. Couple pics at the end of this thread.

https://www.lamborghini-talk.com/vbf...54/index2.html
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Old 09-01-2019, 07:38 AM
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Quote:
Originally Posted by Drew Zee View Post
So I wonder why the specs call out the massive 45 N-m torque?

I looked at it again and still have 4-5 untouched threads left in the pan. Did a search and found a 14X1.5 Dorman plug that has 11 threads, at double the OEM length (0.93 long). Ill be able to engage just as many threads as the OEM plug (4). The metal pieces from the oil pan were all external and came out when the plug came out.
You may still want to run a tap in there to clean the threads, otherwise you risk messing up the rest of them. Could probably just run the tap in a couple threads at a time and not clean the last few threads, cleaning the tap in between so you don't push any shavings in the hole.
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Old 09-01-2019, 07:55 AM
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Quote:
Originally Posted by iownedu View Post
You may still want to run a tap in there to clean the threads, otherwise you risk messing up the rest of them. Could probably just run the tap in a couple threads at a time and not clean the last few threads, cleaning the tap in between so you don't push any shavings in the hole.
Good idea - thanks!
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