hey, what kind of thermostat is this?

[a.d._510_n_ok]

my Dat has always ran cold in the winter so I just assumed it was lacking a thermostat. when I pulled the thermostat housing I found this thing inside:

 

 

I'd never seen one with the copper element and spring off-center. the little brass piece at the top is a wedge that slides back and forth....guessing it's a fail-safe thing? I the brand is motorad but I noticed that the unit never completely closed, even when cold as ice.

 

I replaced it with a standard 180' motorad and am tickled with the engine's new found consistent heating!

[ggzilla]

The little brass thing is called a jiggle-valve and Datsun started using them in the late 1970s. It's good.

 

The spring needs to face into the engine. If it was put in backwards it won't work properly.

[MikeRL411]

Looks like the tilting element valve used in 1970 Buicks. Fairly fail safe, although GM used a hefty bypass hose on the housing. Might be a "oops" substitute?

[Laecaon]

If you dont have the jiggle valve, and you have heating issues, you might consider drilling a 1/8th hole. I know Hainz will do this.

 

Its a good thing though.

[a.d._510_n_ok]

The little brass thing is called a jiggle-valve and Datsun started using them in the late 1970s. It's good.

 

The spring needs to face into the engine. If it was put in backwards it won't work properly.

 

naw, it was installed the correct way but it was stuck partially open.....hmmm.....will replacing it with a regular 'stat make any difference?

[ggzilla]

Yes, of course it will make a difference. Most important it won't be stuck. The jiggle-valve is a small thing, you won't notice the difference if you bleed the air properly.

[metalmonkey47]

Go get one from NISSAN. Best 'stat I've ever owned.

[CharlieW]

The valve is always supposed to be positioned at the 12oclock position. This is so that the system can 'burp'....or vent air out. On my z24 they're is a mark on the thermostat housing for the valve to line up with.

[72240z]

You could consider changing the temp thermostat you use if you want to run hotter/colder. Though if its stuck open thats def why it was always cold.

[a.d._510_n_ok]

can't believe I froze for four years........freakin' heater will run ya out now!

[banzai510(hainz)]

I seen a 510 square headlight in Enumcalw Washington on Sunday just like yours. It was a Auto, in perfect condition.

[Stoffregen Motorsports]

Speaking of thermostats, has anyone here ever used the Toyota two stage thermostat before?

 

[ggzilla]

Looks like a thermostat with a large jiggle-valve. What does 2-stage mean?

 

Here's what Nissan said about the jiggle-valve, which they started fitting in 1970:

* "fitted with a jiggle valve to improve defrosting performance"

* "shorten the warm up period"

[ggzilla]

Reading up on this, the two-stage actually has a second tiny thermostat. This is to deal with certain inadequacies of the the Toyota cooling system. It's used for reason similar to a jiggle vavle to keep a small amount of coolant flowing (a larger amount than a jiggle valve type).

[Stoffregen Motorsports]

I have used them in a few of my own vehicles, especially my rock crawlers. They are added insurance in my opinion.

[ggzilla]

Insurance for what? They are not the fail-safe type.

[oldskoolvws]

Speaking of thermostats, has anyone here ever used the Toyota two stage thermostat before?

 

 

In everything it fits in my friend. Toyota Part Number: part # 90916-03070

 

What this is a three component TS.

 

-The first is the jiggle valve. It can be seen in the picture at about 330 oclock.

 

-Second is the stage one TS. It can be seen in the picture at about 6 oclock. It opens at a cooler temperature to allow water to pass once the engine reaches a specific temperature but still restricts the flow to maintain a minimum constant temperature to warm up the engine properly. This also allows "minimal" heat to your heater core during the winter months to bring heat on early instead of having to wait for the main TS to open. I LOVE THIS!!!

 

-Third is the stage two TS. Obviously the large one in the center. When this opens and closes based on engine temperature (radiator, fan, load, etc.), the smaller one normally remains open to ensure a constant minimal heat load.

 

The concept behind this that no matter the temperature, you do not get a fluctuating heat load typically seen with single stage thermostats that do not have a piped bypass system. It's important on EFI systems because the temperature sensors put you in either open loop or closed loop based on temperature. Once you've reached the stage one TS temp, you no longer bounce in and out of loops.

 

Even with these, I still drill a 1/8" hole in every thermostat to help reduce airlock and maintain a very minimal flow through the TS. I learned about these way long ago when I was modding my 22RE in my 4Runner (which is about to get a brand new rebuilt motor in about 3 days).

[Stoffregen Motorsports]

Insurance for what? They are not the fail-safe type.

 

Read below.

 

The concept behind this that no matter the temperature, you do not get a fluctuating heat load typically seen with single stage thermostats that do not have a piped bypass system. It's important on EFI systems because the temperature sensors put you in either open loop or closed loop based on temperature. Once you've reached the stage one TS temp, you no longer bounce in and out of loops.

[Stoffregen Motorsports]

Like I said, good in a rock crawler which sees heavy winter usage, plus extreme heat at low speeds.

[oldskoolvws]

I fixed it for you :rofl:

 

Like I said, she's good in bed, sees heavy winter usage, plus extreme heat at low speeds.

[Stoffregen Motorsports]

Are we talkin' about my wife or yours?!

[oldskoolvws]

I gotta get mine real drunk to have REAL fun hahaha.