Thermostat white paper

[Nick_53_XK120_OTS]

The XKs old 090160 thermostat (above on wood with 3 cross bars on top) worked in my test in the XK120 application…the “top mounted” sleeve traveled down to completely block off the bypass. This old version is the one based on the RobertShaw that Michael referred to, it is likely not now avail except as old stock. The new 090160 C3731/1 version has 1 single top cross bar, a flat flange with a small hole, , a visible spring. I do not have means to test it for 140/150 or early S1…but it “may” work as well. “May” because the 090160 sleeve is not as tall as the Smiths bellows type, thus covers less, and also it travels not from the bottom to up…but from the upper, to down to block the bypass. This may matter in other model applications if it travels too short or too far;!
The SNG Barrett C3731/1, (and the XKs current listed but not available) has a single bar across the top, a top mounted sleeve without bellows SN%20Barrett%20therm%20sleeve%20type|500x500 ( SNG single top bar) and the original type Smiths bellows/sleeve) Whether it in fact blocks the bypass completely, as it does on the 120 remains to be tested. The SNG bypass thermostat…lists with the Jaguar part # C3731/1 but that means ONLY that they (SNG) selected that # for it, and determined or “feel” that it will do / fit what it is supposed to do where that # was specified by Jaguar. It is NOT a Jaguar part, nor is it like the Smiths type bellows/sleeve part that Jaguar used/installed at the factory. It looks similar to the current XKs C3731/1 090160…but some differences from the old one are easily seen. Whether the sleeve moves “up”,.,or “down” is irrelevant IF: it is has enough sleeve material height to cover the bypass port; and if it moves enough, but not too far, to cover and close the bypass port. Seen here the SNG C3731/1, the XKs 090160, and a original type Smiths X85025. th XKas
the XKs 090160 single top bar & visible spring
the old 3 bar 090160 is a 160C…on the cold side. It has no mfg name mark, it has “J04” “160 G” (prob mis-stamp in China and meant to be a C), and “13” all on the copper button base. and the bottom looks nothing like the current 1 bar 090160 with a visible spring, variant 090160 pics

shown here, a little blurred.but obvious difference.
Nick