With the electric-to-mechanical oil pressure conversion (Duratec) I’m having trouble replacing the electric oil pressure sender into the oil filter / modine mount, with the steel adapter (to take the hose).
The thread (I think) is supposed to be 1/4” NPT.
The electric sender (Variohm EPT2100 94245002) seems like a perfect fit (it can be hand-tightened up to about 3-4 threads in then smooth/gradual spanner tighten.
Whereas the adapter (an MMS 10-3-4, from Think Automotive) cannot be hand tightened in at all, and only embeds about 2 threads in before becoming very tight…so I backed-off with spanner.
At the ‘starting thread’ the outside diameter of the electric sender thread is 13.04mm.
The adapter starts at 13.29mm diameter.
The thread pitches look identical to me, so I’ve concluded it’s just that small increase in diameter making the adapter an uncomfortably tight fit.
I’m assuming just 2 threads inserted on the adapter is not enough?
Any suggestions very welcome. Anyone else overcome this?
Assuming there aren’t different ‘specs’ of 1/4” NPT (?), all I can think of is just trying a different supplier of the adapter at random?
Thanks, Rich