Made another oil drain extension, this one for a rototiller. This time, I started with making a proper engineering diagram with dimension.
Extension, along with custom made gasket:
![IMG_0986.jpg IMG_0986.jpg](https://www.hobby-machinist.com/data/attachments/203/203637-a650b950cfb0d76edf329834ae7ef006.jpg)
Better job of making the hex this time:
![IMG_0987.jpg IMG_0987.jpg](https://www.hobby-machinist.com/data/attachments/203/203638-66c28d6c453f79b5e5935e245657f1c8.jpg)
And the install photo:
![IMG_0988.jpg IMG_0988.jpg](https://www.hobby-machinist.com/data/attachments/203/203639-42ade4f282a54b2dbcf54f95dceff0b9.jpg)
That steel plate just above the extension actually interferes with the flange on the drain bolt (both originally, and the extension made it a bit worse). I ground off most of the flange and that helped. I didn't want to make the extension so it sticks out past that plate, as that would increase the likelyhood it gets hit sideways and bends/breaks off, as the threads are 14mmx1.5 (13mm minor thread diameter), and the through-hole is 7/16" (11.1mm), so there isn't a lot of meat left where that extension threads into the block.
Extension, along with custom made gasket:
![IMG_0986.jpg IMG_0986.jpg](https://www.hobby-machinist.com/data/attachments/203/203637-a650b950cfb0d76edf329834ae7ef006.jpg)
Better job of making the hex this time:
![IMG_0987.jpg IMG_0987.jpg](https://www.hobby-machinist.com/data/attachments/203/203638-66c28d6c453f79b5e5935e245657f1c8.jpg)
And the install photo:
![IMG_0988.jpg IMG_0988.jpg](https://www.hobby-machinist.com/data/attachments/203/203639-42ade4f282a54b2dbcf54f95dceff0b9.jpg)
That steel plate just above the extension actually interferes with the flange on the drain bolt (both originally, and the extension made it a bit worse). I ground off most of the flange and that helped. I didn't want to make the extension so it sticks out past that plate, as that would increase the likelyhood it gets hit sideways and bends/breaks off, as the threads are 14mmx1.5 (13mm minor thread diameter), and the through-hole is 7/16" (11.1mm), so there isn't a lot of meat left where that extension threads into the block.