The Stovebolt Site Forums The Shop Area Engine Shop New Oil Filter Lines

I just got some new oil filter lines from American Classic. The tubes themselves have brass fittings on the ends, but the bottom ends also have steel swivel-type connector fitting. When I went to thread the steel fitting into the brass T fitting at the engine block (this T fitting also connects the oil gauge tube), the threads in the T fitting started to strip.

I checked all of the fitting threads with a caliper. It's kind of hard to tell since the thread length is only about 3/8", but I believe the new hoses have taped threads (there's about a 0.010 inch difference from one end of the thread to the other).

I checked the old hoses and the T fitting, and they seems to be straight thread. Most of what I've read on this forum seems to talk about tapered threads though. If I have to replace the T fitting (which I'm guessing I do), I want to make sure I get the right fitting.

Last thing I want to do is to mess up the threads in the engine block. I guess that may be unlikely, since the brass fitting would strip before the block threads, but I still don't want to take any chances.

Does anyone know if the T fitting for the block should be tapered or straight threads? Any other insight on these hoses and fittings?

Thanks for any info.

Just a quick update. After further checking, the male fitting on the T (the end that threads into the block) seems to have tapered threads. It just seems kind of strange that the male threads on the T would be tapered, and the female threads (where the hose connects) would not be tapered.

the Tee will be an add on item, not original, so you'll need to find a 'correct' one to mate to the other fittings, should be able find it at an auto parts or plumbing store

Bill

Rather than a new T fitting maybe an adapter to fit the end of the hose, tapered to straight thread?

Not to hijack the thread... but I'm getting ready to put an oil filter on too, anyone have a part number for the 'T' fitting?

Thanks Forty9. That came to mind too, and seems to be the easiest fix as long as I can find such a fitting. I'll shop around tomorrow, and if I can't find anything locally, will look online. I just need to figure out what the thread sizes are. Thanks again.

If you have 1/8 pipe threads here is an option
...link...

You can find the same at your local auto parts.

Thanks gents. I stopped by the local Ace Hardware store today, and picked up some fittings. Their selection was a little limited, so I had to get a couple of fittings for each connection to make it work. It pretty much doubles the number of threaded connections, so I'm keeping my fingers crossed that it doesn't leak. I won't know for a little while, since I have some other work to get done before I connect everything back up. Hoping for the best!