I was wondering if anyone knew what the thread diameter and pitch of the hole in the block for the factory temperature sender is.

Justin

 

Justin,

You're posting on the I-6 forum, but your signature says you have an FE. I can measure on either a 240/300 or a 390. I can also state I have seen two different sizes on Fords over the years: 3/8" & 1/2" pipe threads if my memory is correct (don't bet on it). (I think the smaller sizes were in the later years.)

P.S.: By "hole in the block", I assume you mean in the head or intake manifold.

 

Please don't assume people are idiots.

I know I have a 390, it doesn't mean i don't have another 300.
i DO mean the hole on the passengers side rear of the engine BLOCK that the factory sending unit goes in.

The block is a 1985 300.

I figured if i asked a simple question I'd be able to get a simple answer.

Justin

 

Justin,

Sorry if you mis-judged my tone. I sincerely did not know what engine you were referring to. The I-6 forum includes the others that are not 240/300's. I was and still am trying to help you. I even took the time to look at your gallery to see if you were working on a I-6 and which one. If I "hip-shot" a number off the top of my head, I could have messed you up and I just wanted to give you good info.

Now that I know what you specifically have, I measured the sender and compared that dimension directly to a clearly marked pipe tap. The size is 3/8" pipe thread - 18 threads per inch and OD of .675". (This is on both a '68 240 and a '80 300.)

You are correct - it is in the block at the passenger-side rear right below the deck surface. While I am working on both a 240 and a 300, I have not pulled the heads from the blocks and honestly thought the sender was in the heads. This is the first block-mounted temperature sender I have run across and it did catch me off guard. (Feel free to call me an idiot, I can take it.)

I only asked the questions I asked to give you reliable information. If I had really assumed you were an idiot, I would not have been trying to help you.

 

I'd like to apologize for being short as well. I hadn't realized that the forum had been expanded beyond the 240/300, i should have been more specific.

Anyway, i thank you for your response. It has saved me a bit of running back and forth trying to figure this all out.

Justin

 

Justin,

I appreciated your contributions to my Brownie thread - glad we are OK. I still recommend being cautious because I have seen smaller senders in later Fords (V-8's). Ususally a 3/8"-pipe to 1/4"-pipe bushing will get the little sender deep enough in the coolant to work properly.

 

I dunno, i tend to see smaller ones in the earlier motors. the 390 I have has a 1/8-27 NPT sender in it that I'm actually about to drill and tap out to 3/8-18 NPT so i can use an aftermarket gauge.

Anyway, it wound up being a 3/8-18 hole in the block, so i got that all worked out too.

Justin