Re: 1954 Packard Pacific Oil pressure sending unit 4 way brass tee adapter filter/unit/gauge/block
Posted by HH56 On 2019/10/17 11:34:10
I would be concerned about a mix between NPT and BSPT and would suggest you verify exactly what you are working with. Napa says there are two NPT thread pitches -- 1/8-27 and 1/8-28 as well as other threads with various differences all in the 1/8-27 or 28 thread range. I am reasonably sure Packard used 1/8-27 NPT at that location but perhaps picking up a thread pitch gauge and checking what you have in the fittings or sender would be worthwhile. It could be that a wrong fitting was thrown in and picked from a box somewhere along the line and you wound up with it. Amazon has several fairly inexpensive gauge offerings, a couple of which are sets capable of measuring almost any thread and pitch ever made.
If a chance the new fittings are BSPT which Napa says has 28 threads or another fitting with the wrong thread I would check if the new fitting and nipple will thread into the block properly before worrying about the sender. Doubt it will and you may have the same issue as the sender. If so that would need to be addressed first. If OK there, you might measure the threaded distance on the sender to make sure there is not an excess length of threads as the reason it appears to be sticking out so far. If that looks OK use one of the straight fittings that came from Max to see if the port in the fitting used for the sender is damaged and is the reason the sender is not threading in. It could also be the sender has the wrong thread. Napa has several senders in the 3-9 psi range including a couple of BSPT versions.
If the sender or fitting is not threading in more than a couple of threads I would be concerned about pressure blowing something off. If it goes in a respectable distance without cross threading or otherwise damaging the threads and seems to be secure then any leaks may or may not be controlled with teflon tape. Just be sure the tape does not manage to wrap the end of the sender or nipple and cover the hole. That has happened to a few people when using the teflon tape at various other places.
Here are the 1/8 selections Napa shows for threads available in various senders they list. A lot of the list are duplicates or the same thing differently written so only 4 or 5 actual differences. No idea how many of those threads might be available in brass fittings but still enough to cause issues if mixed.
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If a chance the new fittings are BSPT which Napa says has 28 threads or another fitting with the wrong thread I would check if the new fitting and nipple will thread into the block properly before worrying about the sender. Doubt it will and you may have the same issue as the sender. If so that would need to be addressed first. If OK there, you might measure the threaded distance on the sender to make sure there is not an excess length of threads as the reason it appears to be sticking out so far. If that looks OK use one of the straight fittings that came from Max to see if the port in the fitting used for the sender is damaged and is the reason the sender is not threading in. It could also be the sender has the wrong thread. Napa has several senders in the 3-9 psi range including a couple of BSPT versions.
If the sender or fitting is not threading in more than a couple of threads I would be concerned about pressure blowing something off. If it goes in a respectable distance without cross threading or otherwise damaging the threads and seems to be secure then any leaks may or may not be controlled with teflon tape. Just be sure the tape does not manage to wrap the end of the sender or nipple and cover the hole. That has happened to a few people when using the teflon tape at various other places.
Here are the 1/8 selections Napa shows for threads available in various senders they list. A lot of the list are duplicates or the same thing differently written so only 4 or 5 actual differences. No idea how many of those threads might be available in brass fittings but still enough to cause issues if mixed.
Attach file:
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