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Since the thermo-time switch (TTS) is absurdly put under the cylinder #4 inlet manifold pipe and next to the firewall, various replacement methods have suggested either totally removing the inlet manifold and injector hoses going throught the manifold to completely expose the TTS, or partly removing the manifold by pulling it back half an inch to get a U-spanner between the head and manifold onto the TTS.
An easier and quicker method is to get an extended depth 19mm socket so that it fits over the TTS electric connector part and over half of the TTS brass 19mm part - that is, over most of the TTS. The inlet manifold flange blocks getting the socket over the entire TTS. (Depending on the length of the extended depth socket you might need to use a friction saw to cut off a quarter to half inch of the 19mm socket so that it doesn't hit the engine dipstick pipe - my socket was OK though. The dipstick pipe is flexible enough to bend a little bit to get more access). Then fit the socket to a flexible 1/2 inch drive shaft connected to a 12 inch rigid drive shaft, keeping all in a straight line and unscrew TTS. A small mirror lets you get the socket on the TTS.
Alternately, you can use a 1/2 inch universal joint drive in place of the 1/2 inch flexible drive, but in this case the 12 inch rigid drive is vertical whereas previously it was at 45 deg angle. (I removed TTS with flex drive method and replaced it with universal drive method to try both).
The extended 19mm socket cant place pressure on the plastic electrical part of the TTS and risk breakage (check this by partly inserting the removed dead TTS into the socket, angling the TTS in the socket as much as possible, and poking a thin wire down the top of the socket to check for a gap).
The hardest part is working "blind" to re-insert the electrical plug into the TTS since the space is tight for fingers. The plug is (barely) polarised so if it mysteriously wont go in, rotate it 180 deg.
Sutherml in Adelaide, South Australia
1979 244; 535,000 km
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