Fixing your $1 to $107 TVSV....

[takza]

Here is the BROKEN TVSV:




Here is the FIXED TVSV:




I had bumped this thing before and hoped I hadn't broken or weakened it.

The plastic involved is not a plastic that will weld using plastic solvents...it's more like Bakelite.

I used JBWeld to glue it...after roughing up the surfaces with a wire brush.

Should hold pretty well and is fixed....IF I didn't glue the "piston" to the base.

Now has a little more support for protection from its runins with occasional BUMPS & STUPID MECHANICS. <_<

<span style='font-size:14pt;line-height:100%'>NOT!</span>

<span style='color:blue'> JBWeld didn't hold...gave it 24 hrs to set up. The spring in it is very strong...when the engine heated up and the "valve" was pushed up, it came apart. Have it wired together now...might hold...might not.

Heard someone say once that JBWeld wasn't that good...didn't seem to cure too well. Have used a putty type epoxy on a leaking water pipe and it held for 2 years.

Much care is needed when working on or around the TVSV.

I vote the TVSV as the most PITA small part on the Tercel 4WD.</span>

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Went looking for a used one at the most likely place (after calling around some) and all the yard had was the later 12V engine. So I decided to have a go at a repair AGAIN...instead of chasing all over Hades for another one (or is this the Earth?...I get mixed up).



Used some "garden wire" that is made for twisting and so forth, AND some radiator repair epoxy...this stuff hardened in 5 minutes. Seems like it is finally FIXED. Wired the top on like the cork in a wine bottle.

The plastic Toyota uses has some kind of fiber in it...so it is probably pretty strong. The JBWeld had finally hardened when it was chipped off.

[tercel4wdrules]

On mine on of the ports was broken off. Luckily I have a spare one from the old engine it had. Someone sealed it using silicone sealer. The same went for the VSV it also has one port broken.

[warbstrd]

dont forget to test it to make sure it works correctly...

[deejay1272]

Noob question here: What is a TVSV and what purpose does it serve?

Thanks in advance,
Dan

[takza]

It's a temperature sensitive vac valve that switches vac thru various port depending on...temp. Causes issues if it doesn't work right.

[deejay1272]

Hmmm, thanks for the info. I shall inspect this soon. Any thoughts on what TVSV stands for?

[ARCHINSTL]

Thermostatic Vacuum Switching Valve
If you need one - check out the last pix on member bleakhorizon's recent offering of parts; his might still be available.
Tom M.

[Chevro]

I needed one because I broke it while trying to fix my car. that thing seems to be right in the way, and easily broken.

last time I went to the junkyard I found three tvsv's, other year and model toyota's use them. Oh yeah they were free too!

[xirdneh]

I needed one because I broke it while trying to fix my car. that thing seems to be right in the way, and easily broken.

last time I went to the junkyard I found three tvsv's, other year and model toyota's use them. Oh yeah they were free too!

you might want to test them per the FSM before installing
for some reason the piston quits traveling the full distance
i did a write up a few months ago explaining my method of fixing them