| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,026 Posts1,055,410 Members48,422 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Nov 2002 Posts: 1,002 Shop Shark | | Shop Shark Joined: Nov 2002 Posts: 1,002 | I started to post this in "Engine and Driveline", but I think maybe it belongs here. I'd like to buy the tools to chase the thread on the hole where the oil sensor screws into the block on the 250/292. I've always thought it was 1/16 pipe, but that doesn't seem to exist, and I haven't got my Machinist handbook to verify.
Larry
I don't own a vehicle that isn't old enough to drink.
| | | | | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | Larry,
I will have to agree with you...I have never seen a pipe thread that small. 1/8" pipe is VERY common and probably what you have. The next size up would be 1/4" but this would be too large.
When you buzz up to your friendly ACE hardware store, take a piece of your plumbing and do a side by side to make sure.
When you chase the thread, try to clean it up but not cut any deeper. The pipe thread is a taper thread and your sending unit or whatever might bottom out before becoming tight if you go wild with the new tap. Be sure to flush all the smegs out of the hole.
Stuart | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy Larry, Firstly Merry Christmas buddy, now to answer your question, the hole is 1/8 n.p.t., I've been around machinery for years and I can honestly say I have never actually seen a 1/16 n.p.t. hole in anything, I know according to the charts it is supposed to exist, but I have never seen it. | | | | | Joined: Apr 2003 Posts: 608 Shop Shark | | Shop Shark Joined: Apr 2003 Posts: 608 | Larry I agree with 3B here,
Been there with 1/8 Natl pipe thread.
Have heard of 1/16 but never seen it in automotive applications.
Dont think it would even hold up to the vibe/strain of underhood engine life.
But I do know that you,ve got a 1/8 pipe thread there. | | |
|
|
| |
