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Oil pan drain plug... threads stripping out?

 
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Old 03 Jun 2016, 11:43 am
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Question Oil pan drain plug... threads stripping out?

Say, does anyone think this a common problem with PTs?

Last couple of oil changes I had, (at various drive-in-oil-change places) the techs there were commenting that they were concerned about the threads on the oil pan drain plug. No leaks to date, but I'm starting to get paranoid about the next oil change (Not entirely confident about the quality of the techs at these places, and I have tried every one in town...)

Anyway, it's time for an oil change, and now being a bit leery of the oil-change places I'm contemplating booking it in at a dealer.

Was just curious - if somebody does strip out the drain plug, does that mean I'll need a new oil pan? Or is there a reliable insert for this application?

Also - does the drain pan bolt have a crush washer that should be renewed every time? ( or periodically? )
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Old 03 Jun 2016, 11:48 am
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Default Re: Oil pan drain plug... threads stripping out?

PS: .. "in the event"... has anyone had success with these 'oversize self-tapping' products?

Dorman Products - Search Results

(just found a reference in another thread here)
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Old 03 Jun 2016, 11:53 am
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Default Re: Oil pan drain plug... threads stripping out?

When I got my Outback in 2008, I was contemplating putting on a Fumoto Oil drain valve. It looks like a spigot. It costs in the mid $20's so you don't need to unscrew/screw the drain plug every time you want to change your oil.

I never did it because in all the oil changes I've ever done, I've never found the need so why add one more failure point. I guess if I really messed up and stripped the threads, it would have been worth it, but unless you (or the oil changer) are really careless, it's unlikely to happen. The plug is hard and the pan is steel, not like a soft aluminum engine block where you might cross thread a blind mate.
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Old 03 Jun 2016, 11:54 am
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Default Re: Oil pan drain plug... threads stripping out?

on my PT I have rounded the drain plug my bad but never stripped it out
I have however use the over size drain plug it is basically a self taping
bolt and it worked on the 350 chevy I used it on

I cant see what they think it is "ABOUT TO STRIP--unles they really over tourqued it one time)
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Old 03 Jun 2016, 01:09 pm
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Default Re: Oil pan drain plug... threads stripping out?

The Dorman plugs work good in my opinion. When I got my Cruiser, the plugs was on its last thread and I had to do something on the next oil change. 1 over size plug did the trick. I've used them in the past on Fords just like cruserdad1976 used them on Chevys.
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Old 03 Jun 2016, 01:13 pm
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Default Re: Oil pan drain plug... threads stripping out?

I would first try re-tapping to the original size (or try using a new bolt) to clean-up the threads before I over-sized the hole.
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Old 03 Jun 2016, 02:17 pm
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Default Re: Oil pan drain plug... threads stripping out?

Quote:
Originally Posted by VsandFords View Post
The Dorman plugs work good in my opinion. When I got my Cruiser, the plugs was on its last thread and I had to do something on the next oil change. 1 over size plug did the trick. I've used them in the past on Fords just like cruserdad1976 used them on Chevys.
+1 Same good experience as mentioned here. They seem to work well.
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Old 03 Jun 2016, 02:21 pm
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Default Re: Oil pan drain plug... threads stripping out?

Quote:
Originally Posted by Grasshopper77 View Post
I would first try re-tapping to the original size (or try using a new bolt) to clean-up the threads before I over-sized the hole.
If its already loose cleaning out the threads might not work
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Old 03 Jun 2016, 05:11 pm
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Default Re: Oil pan drain plug... threads stripping out?

In restoration, I've often solved similar problems by going "oversized".

In the case of your stripped drain hole and plug, using the Dorman self tapping oversized plug would be the most reasonable, conservative, reliable fix.

If you can start it with old oil still in the pan, the outflow after the re-thread should flush out any residual metal shavings. I'd get in there with a magnet too,just to be sure they're all cleaned out.

Hopefully the new Dorman plug is magnetized. A great feature in an oil plug! I'm guessing all of that is addressed in the Dorman kit. Good luck.

Happy Ptin', ptprice
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Old 04 Jun 2016, 01:20 am
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Smile Re: Oil pan drain plug... threads stripping out?

It's hard to tell if they are genuinely worried about it, or just want some extra coin from you. One way to tell might be to ask them to have a look at before they fill it with oil again and judge for yourself if it's really loose or shows sign of thread damage. If they say no, it's probably just an excuse.

Whenever I do any work on someone else's car, I always show the faulty parts to the owner if I can and explain why the part is faulty. I always offer them the old parts to take away with them and I'm just as happy to show them the faulty part on the vehicle if it's possible before I do anything to it.

If the oil pan was stripped, which is very unlikely in normal use, it can only happen if some idiot really over tightened the plug. I have seen some places use strong bars to remove and re-tighten drain plugs, or worse, an impact gun. I walk away shaking my head and thinking "if only the owner knew...".

To repair it after being stripped, I would drill the pan and fit a helicoil steel insert along with a new plug. Clean up with a flush to remove any stray shavings, fit a new filter and fill with oil, tightening the new plug to 20 ft/lb.
It's a little more involved than using some self tapping after-market thing, but the advantage is it restores the original thread size, allowing you to use a genuine part in the future should it need replaced.

It may of course just simply be a worn drain plug, it does happen. For all the cost of a replacement, if there's any doubt about the condition of the original, I would just get one and toss it in the glove box for next time
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