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Stripped Oil Pan Threads

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7.9K views 22 replies 13 participants last post by  dddd  
#1 ·
Need to rethread the oil pan threads. Seen a lot of different kits online at various prices. Also some kits tap the hole and secure a new thread insert for a new size plug and some just tap the hole.

Looking for recommendations on kits and methods

thanks
 
#11 ·
Drain plugs and the pan's threaded bung are designed for quite heavy torque application, the better to allow a drain plug to resist a heavy blow from road debris without loosening.

As such, the self-tapping, slightly-oversized plugs are great, as long as the person changing the oil knows what they are looking at, and uses a bit of extra care. There won't be any self-tapping "action" during subsequent oil changes as long as the plug is started cleanly in the pan's new threads threads going forward.
 
#13 ·
I know nothing about the configuration of the bottom of the engines used in Camry's but is it possible to replace the oil pan (lower pan if it's two pieces). I wound up doing that in my Tacoma 4.0L when the oil drain plug bolt would no longer stay put after 400,000 something miles
 
#18 ·
The very last thing that you want on a street-driven car is a drain valve protruding, waiting to get whacked/damaged by whatever trash inevitably passes under you car at 70mph.
As I mentioned earlier, drain plugs/pans are made to take serious wrench torque for the same reason, so as to be able to take a heavy strike without loosening. When, not If!
 
#21 ·
No need for any steel thread insert on the Camry, since the pan is made of steel.

It's simple to probe the stripped hole to determine it's depth, likely the oversized "chaser" plug is shorter than the hole so no shavings should get above the inside end of the hole.

Beware of any repair plug that uses a rubber washer. The amount of torque on the bolt would need to be drastically reduced, and the reduced torque and bolt tension may not retain the bolt reliably!(!)
I would replace any such polymer washer with an aluminum, copper or even steel washer.
 
#19 ·
If you say so!

Because that is what a lot of fleet cars, trucks and vans use, since they require frequent oil changes, being on the road so often. Taking the drain plugs on n off enough times, even if you use a torque wrench every time, who can say what will happen to the threads.

Unless you had used one before and that’s what happened to you!
Btw, I was being sarcastic because so many suggestions without even knowing what they are dealing with.
Again, just saying!
 
#23 · (Edited)
Looking at the video, seems like a guy willing to experiment with a weakly-retained drain plug.

The washers he bought don't look like a decent fix for a stripped pan, but he arrived at a fix.

There was a progression of ever-weaker threads compressing ever-softer gasket materials that was found to work.
Removing the plug might indicate just how well that the thread "sealer" can hold the plug from turning "actually feels like it's in there pretty good" as he mentioned.
The "sealer" sounds to me like the 243 grade of Loctite, the one that works on oily threads. I've used it and it does achieve a very good grip on oily/greasy threads!

Bummer that he couldn't get the double-oversized plug started, might achieve a tight enough threading/turning fit that high bolt tension isn't needed to keep the bolt from loosening, and which jibes with the use of the rubber washer that these plugs come with.
The tip is deeply slotted, so one can tap the bolt/plug in with a hammer and which will compress the two sides together like a spring until the threads start catching (make sure the plug is going in straight before turning it in further).
But interference at the threads will eventually loosen after a few (or a many) oil changes, so the thread locker "sealer" might be especially important in the more distant future.