1956- Water temperature and Oil pressure sending unit size

[albjerryg]

I have gotten 2 different pieces of information on the size of the threads on the Temperature and Oil pressure sending units, one says it is 1/4"-18 NPT the other is 3/8"-18 NPT. I have a 1956 Tbird and want to know what the thread size is for the 2 sending units? Thanks for any help. Jerry

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[Tater Salad]

Mine is a 55 292, with 1/4-18 NPT for both holes

 

[biddle]

Please include the model years(s) in the subject on your future posts. Adding this for you now.

 

[thessler]

Just take it out and measure it.

 

[doug7740]

The original 1956 temperature sending unit has 3/8 pipe threads. This type sending unit was also used on the 1955 model.
The 1957 temperature sending unit has 1/4 inch pipe threads.

doug7740
1955 Thunderbird Blue

 

[Tater Salad]

ECK block, according to Ford y blocks John Mummert were used in Tbirds in 55 and 56. See attached my 292 is an ECK block. I just jacked it up, crawled under and measured the o.d. of the remaining threads on the oil sending unit, with a Brown & Sharpe dial caliper. The o.d. measured .532", which is very near the .540" machinist handbook specs for the major diameter of 1/4-18 NPT. The 3/8-18 NPT is spec at .675"major diameter. I didn't pull the water temp unit to verify that hole due to throttle linkage bracket. But im pretty darn confident it's 1/4-18 NPT.

 

[Tater Salad]

ECK block, according to Ford y blocks John Mummert were used in Tbirds in 55 and 56. See attached my 292 is an ECK block. I just jacked it up, crawled under and measured the o.d. of the remaining threads on the oil sending unit, with a Brown & Sharpe dial caliper. The o.d. measured .532", which is very near the .540" machinist handbook specs for the major diameter of 1/4-18 NPT. The 3/8-18 NPT is spec at .675"major diameter. I didn't pull the water temp unit to verify that hole due to throttle linkage bracketView attachment 14261. But im pretty darn confident it's 1/4-18 NPT.

Ive been digging for the old temp sending unit for last hour with no luck. Suppose I could have pulled the throttle bracket and sending unit quicker. After looking at pictures of the temp sending unit im no longer confident the threads are 1/4-18. But that doesn't change anything with the measurements of the oil pressure unit. Call any of the little bird parts suppliers and they'll pull one and let ya know.