You guys deserve an update. The outer sutures on one of my incisions let loose so I still have to take it easy until it closes up. So no cage work until then.
I'm going crazy so I thought I'd knock out some "easy" stuff that needs to get done. I'm not really ready to fabricate my dash but I can at least get the oil pressure sensor and coolant temp sensor installed.
Toyota uses 1/8 BSPT threads and my sensors use 1/8 NPT. Close but not the same. The coolant temp sensor for the gauge on a 3.4 is in a cluttered area on the back of the intake manifold. I saw where guys were putting it in the water outlet where a T-stat USUALLY is. The return to the top radiator hose. Sounds easy enough.
It's behind the plastic timing cover and right away I see it is also crowded. The only way I see for it to fit is pointing to the driver side at a slight up angle. I held the sensor where it looked like it needed to go, marked the spot and used my phone to get the angle.
Drained the coolant low enough to pull the water outlet and saw a blob of corrosion. WTF?? I had a clean system and fresh coolant when I did the timing belt and water pump. The coolant looks perfect. Anyway, another flush is in order once I get the sensor mounted.
IDK what these forum posts are talking about with tapping threads in a thick pad?? No pad and it's too thin. I decided to take a chance and weld a bung on. Welding cast aluminum is risky but I went for it.
I found a piece of round 6061 in my chip tray so I turned a small hat shaped solid slug to 5/8" diameter by 3/8 tall with a little flange at the bottom for a weld fillet. I used a pilot bit to mark the center.
I made a fixture to bolt the water outlet to (at the proper angle) so I could position it in my mill vise. Milled a 3/4 diameter flat pad for the slug to sit on.
Clamped it in my vise and did a solid tack with my TIG. Flipped it and tacked the opposite side. This was a bitch to weld. I started out being patient and letting it cool between sections. Then I got impatient and almost had the casting drop out under me because it got too hot.
Stuck it in the drill press vise, drilled and tapped it. Got it installed and it barely clears the fuel line. Oh yeah, you can't pull the outlet until you either remove the fuel line between the two fuel rails or pull the mounting studs. I had to buy some E-sockets. Took an E-5 to remove them. Went back together with M6 x 16mm long, JIS flange head bolts. Glad I was able to knock out one of the "easy" jobs real quick.