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smart142

Oil pan drain - how NOT to!!

4 posts in this topic

This mod was done by a mechanic who said he was going to weld a drain plug.

Instead a hole was drilled and a tranny drain bolt was installed.

As you can see it wouldn't fully drain the pan.

And the nut and bolt wasn't tightened and it was leaking on the driveway.

 

The last picture shows a castleated nut, when welded on the inside of the pan, would allow proper drainage. That's what I've done in the past.

 

1st pic shows outside of pan

2nd drain plug rem'd

3rd inside pan - note that oil level to thickness of nut would not drain

4th a castleated nut that would allow complete drainage

 

 

 

 

 

 

 

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Neat idea not having to weld, but I feel like once you have the pan off to put the inner nut onto the bolt, it's hardly any more work to just weld in a proper bung from the outside:

https://www.ebay.ca/itm/Oil-pan-drain-plug-weld-in-KIT-STEEL-12mm-STEEL-BUNG-STEEL-PLUG-WASHER/152945970865?hash=item239c4a4eb1:g:we8AAMXQVT9S6d3w&vxp=mtr
 

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Welding the castleated nut in place inside the bottom of the oil pan makes sense.  It is permanently attached to the pan in the right spot and allows all the oil to drain.

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