[E-Type] Temperature Sender Threads?

Does anyone know what the theads are on the temperature
sender? I want to machine a replacement, but don’t want to
remove the old one just to measure the threads.–
Ray Livingston - '64 OTS Santa Cruz, CA
Santa Cruz, CA, United States
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In reply to a message from Ray Livingston sent Fri 12 Sep 2014:

Ray,
If you dont get a good reply by tomorrow, I can measure my old one
it’s in abox in my garage someplace.–
The original message included these comments:

Does anyone know what the theads are on the temperature
sender? I want to machine a replacement, but don’t want to
remove the old one just to measure the threads.
Ray Livingston - '64 OTS Santa Cruz, CA
Santa Cruz, CA, United States


jcarey : (888373) Bettie IV - my '63 S1 FHC in progress
Los Gatos/California, United States
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In reply to a message from Ray Livingston sent Fri 12 Sep 2014:

Ray

I seem to recall 5/8’’ 18 UNF. Why not just remove it, you won’t
lose any coolant.

David–
The original message included these comments:

Does anyone know what the theads are on the temperature
sender? I want to machine a replacement, but don’t want to
remove the old one just to measure the threads.


David Jones, S1 OTS
Nottingham, United Kingdom
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In reply to a message from Ray Livingston sent Fri 12 Sep 2014:

Ray,
Have a new sender from Terry’s, threads are 5/8-18.–
The original message included these comments:

Does anyone know what the theads are on the temperature
sender? I want to machine a replacement, but don’t want to


EdIrwin 62 FHC
Jefferson City Missouri, United States
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In reply to a message from Old Ed sent Sat 13 Sep 2014:

Thanks, Ed!–
Ray Livingston - '64 OTS Santa Cruz, CA
Santa Cruz, CA, United States
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No way. I would suggest a BSP thread, probably tapered…maybe
1/4-19? You could maybe force a UNF thread to fit the hole, but it’s
not going to be right.

Mike Frank

At 10:50 AM 9/13/2014, you wrote:>I seem to recall 5/8’’ 18 UNF.


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In reply to a message from Michael Frank sent Sat 13 Sep 2014:

Way! Thread is 5/8’’ 18 UNF on Smiths sender TT4201/00. Here is a
picture of one and that does not look like a BSP taper to me.
http://tinyurl.com/nt9vhuf It also cross references to an AC-Delco
part which gives the same measurements.

David–
The original message included these comments:

No way. I would suggest a BSP thread, probably tapered…maybe
1/4-19? You could maybe force a UNF thread to fit the hole, but it’s
not going to be right.


David Jones, S1 OTS
Nottingham, United Kingdom
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In reply to a message from Heuer sent Sat 13 Sep 2014:

Sorry, forgot to add the AC-Delco sender dimension chart:

David–
David Jones, S1 OTS
Nottingham, United Kingdom
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Surprised. Most of the water and oil plumbing is BSP, because the
parts were spec’d by their respective manufacturers.

I’d still bet BSPP 1/4-19 until I could measure one.

Mike Frank

At 01:13 PM 9/13/2014, you wrote:>In reply to a message from Heuer sent Sat 13 Sep 2014:

Sorry, forgot to add the AC-Delco sender dimension chart:

http://tinyurl.com/p4rwv8r


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In reply to a message from Michael Frank sent Sat 13 Sep 2014:

I just had a look. There’s definitely no taper, and it
measures 18 TPI perfectly (although I don’t have a 19 TPI
thread gauge for comparison). It screws into a 5/8-18 nut
like butter.

Agreed that many fittings are BSP (oil pressure switch, oil
pressure sender, all of the water pump barbs, large
threaded freeze plug/provision for block heater). But at
least one example of UNF is the row of oil gallery plugs
opposite the mains on the intake side–1/2-20.–
The original message included these comments:

I’d still bet BSPP 1/4-19 until I could measure one.


Bob Wilkinson, 73 XJ6
Saint Louis, MO, United States
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But…will a 5/8-18 bolt fit into the head without resistance? That
would convince me.

The reason some fittings were BSP (some BSPP some BSPT), is that the
senders, gauges, and cooling system components were designed by
Smiths, Lucas or Marston, based on their generic production and
internal standards. I expect that Smiths was fully capable of turning
out UNF fittings, but I’ve been stuck finding the right BSF or BSP
fitting or fastener often enough to have my doubts.

Mike Frank

At 06:04 PM 9/13/2014, you wrote:>In reply to a message from Michael Frank sent Sat 13 Sep 2014:

I just had a look. There’s definitely no taper, and it
measures 18 TPI perfectly (although I don’t have a 19 TPI
thread gauge for comparison). It screws into a 5/8-18 nut
like butter.

Agreed that many fittings are BSP (oil pressure switch, oil
pressure sender, all of the water pump barbs, large
threaded freeze plug/provision for block heater). But at
least one example of UNF is the row of oil gallery plugs
opposite the mains on the intake side–1/2-20.


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In reply to a message from Michael Frank sent Sat 13 Sep 2014:

I recall hearing from a couple owners that screwing in a
new replacement sender was not a smooth installation.
Sounded like a fair amount of nervous wrenching.

They blamed it on old threads, brass v aluminum or whatever

  • but if the replacements are 5/8-18 (and it seems they
    are) and the originals were not that could also account for
    the difficulty.–
    The original message included these comments:

But…will a 5/8-18 bolt fit into the head without resistance? That
would convince me.


Geo Hahn 1969 OTS 4.2
Mt Lemmon, Arizona, United States
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In reply to a message from Geo H sent Sat 13 Sep 2014:

When I removed my temp sensor, it was a touch and go
situation, I worked it back and forth slowly until it was
free. Noted the female threads were a bit ragged, the
sensor male threads had aluminum deposits on them. Checked
the female and male threads, they were 18 TPI. I chased the
female threads with a tap, had no problem with installing
the new sensor. (Installed with anti-seize compound on the
threads-which is a given for anything that is threaded into
aluminum, and would have made removal much easier if it had
been used before)
The sensor is installed with a copper gasket, that
indicates that a straight thread is correct, as gaskets are
not used with a tapered thread.–
The original message included these comments:

I recall hearing from a couple owners that screwing in a
new replacement sender was not a smooth installation.
Sounded like a fair amount of nervous wrenching.
They blamed it on old threads, brass v aluminum or whatever


EdIrwin 62 FHC
Jefferson City Missouri, United States
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