Hot Air Intake Engine Location

[kurtnkegger]

I've read various threads, but still can't find where the hot air intake tube attaches to the engine. I've looked all around the engine side for the ports pictured on SOR, but didn't see anything.

I took the FJ for a nice long drive to the foothills today, and when I got home, I checked the HAI gate on the air cleaner to see if it was open or closed...previous threads I have read have stated the gate closes at a pretty low temperature.
It was still open, like it was looking for the hot air. It runs fine, and normally I wouldn't complain about this...but when wheeling, and crossing water, my 40 sputters and will usually stall either in the water, or on the bank on the other side. My theory is the thick steam created by the hot engine is getting sucked in at the HAI on the air cleaner causing it to choke out. My truck starts right up after...even when it's 3 feet deep in water...after the steam clears.

I think if I can get the HAI hooked up properly, and get the gate to close I would eliminate my water crossing woes.

By the way, it's a 77 with California emissions. Please post a pic of what I'm looking for if you have one!!

Thanks!

 

[skidplate]

I took my aircleaner apart for the first time to see why my HAI flap was always half open or half closed (depending on how you look at it) , found the thermal springy thingy was broken so I rivited the flap open. I'm in central Cal. so it never really gets that cold. MIne is a'75 federal emissions with a safari snorkel.

 

[Fast Eddy]

There's supposed to be a heat shield bolted to the front of the manifold with a tube pointing up, straight below the HAI. In your case it sounds like it's stuck open.

I've made a couple of these from sheet metal and even aluminum foil and wire to get past the smog man.

A good pic, but it's from a minitruck 22re:

Some 2f pics:

And the unobtanium part you want:

 

[kurtnkegger]

Thanks!! I guess if the part is missing, it is incredibly hard to find!! Guess I'll have to start fabbing something up.

I appreciate your input,

Kurt

 

[FJsnoozer]

i might be able to find it lying around this weekend. ill pm you if i do.

 

[dasgeek]

I am trying to put the hot air intake back together. I have a 1980 FJ40 built in May of 1980 according to the VIN lookup.


Here is what my heat intake looks like. It was just hanging from the metal hose. Anyone have a picture of the original part?

Looks very different from the shield in the post #3.


Manifold where the intake mounted:

Here is the part:

 

[Landpimp]

I remember one day hearing something fall off and hit the road.....went back and found what looked like the pic above

 

[dasgeek]

I really hope somebody can post a picture of what this part is supposed to look like. Please....

I am guessing that the strings are some kind of asbestos shield that was shaped around the manifold.

 

[Landpimp]

this is a new one(don;t know where it got the corrosion from) for I think a 8/76-1/79 and the hose, I think I have a new one for a 81-87 someplace. And no....not for sale

 

[spotcruiser]

This photo of mine, posted previously above, was for my CA '78. Your '77 should be the same. They were different than the Federal models, due to the shape of the CA thermal reactor.

You can make something similar in steel. I modified one from a different year to make the one shown below for my '76, recently. They should have been steel from the beginning.

I really hope somebody can post a picture of what this part is supposed to look like. Please....

I am guessing that the strings are some kind of asbestos shield that was shaped around the manifold.

 

[dasgeek]

Thanks for the photos. What is up with the one from my truck? Are the ones you guys have lined with something on the inside? Where did the strings come from?

 

[spotcruiser]

It was some kind of heat-resistant material. A mix of asbestos maybe, or fiberglass, and steel mesh. They didn't last long and were pretty damned expensive to replace. The one I had for sale cost $90 many years ago and had a very limited market.

Thanks for the photos. What is up with the one from my truck? Are the ones you guys have lined with something on the inside? Where did the strings come from?

 

[fj401978]

this is a new one(don;t know where it got the corrosion from) for I think a 8/76-1/79 and the hose, I think I have a new one for a 81-87 someplace. And no....not for sale

Man, that is just wrong...posting a picture of this shield and then a note about 'not for sale'...what a tease!

Wish I could find one like that...how long have you been hording that thing?

 

[subzali]

someone should make these in stainless for those of us who have to deal with smog...but at this point I'd go for anything aftermarket since these are so hard to find. I have one in ok shape except for the mounting holes are worn through large enough to fit the bolt and washer...

by the way Kurt there is supposed to be a matching one on the back corner of the manifold against the firewall, without the heat riser tube section. Classic Cruisers in Salida might have some.

 

[fj401978]

According to toyotapartszone.com, insulator part #17167-61012 was for 1979-1987, and 17167-61011 was for 1976-1980. The hose is still available, part #17881-61010, $34.33 at toyotapartszone.com.

 

[Landpimp]

I may have mixed them up, I should have both someplace. The one in the picture came with a 78 FJ40 I bought......there were boxes and boxes of new OEM parts stacked in the back of it. I thought the late model version looked different then the one I posted...will look at my 82 and report back

I replaced both shields and hose on my 82 FJ40 about 8 years ago(back when I could get a new OEM carb and both manifold). On my 86 Fj60......the shield is gone, but it starts and runs the same as the 40.....so I am not going to replace it, even though I am going to tear into it and replace the manifold gasket

I would guess they only came with the asbestos or whatever it is, when new, maybe the EPA said you can't use that stuff anymore?

 

[fj401978]

I'm kinda like subzali above...I think one of the fab gurus on here should make some stainless ones...maybe you could loan them the 'new' one you have for a pattern, if needed. I have a fair 'fabric' one, it's starting to shred in one spot, and one of the metal grommets for the bolt hole is starting to come out. Sure would be nice to be able to replace with a new one. Could you compare the other one you have with this one? I wonder what the difference is...

 

[Fast Eddy]

I got a pair, the HAI connected to the front heat shield and the rear blank heat shield at the PMC swap meet for $15.

The one that's going to get replaced is the nas-bestos one which is in ok shape and works for the smog man, but only one bolt hold it on, and barely.

The $35 hose that's still available is also available in generic form for about $2.

According to toyotapartszone.com, insulator part #17167-61012 was for 1979-1987, and 17167-61011 was for 1976-1980. The hose is still available, part #17881-61010, $34.33 at toyotapartszone.com.

And the one spotcruiser posted is 17167-61031, for the Thermal Reactor CA exhaust manifold. I still wish I bought that one.

 

[subzali]

I got a pair, the HAI connected to the front heat shield and the rear blank heat shield at the PMC swap meet for $15.
The one that's going to get replaced is the nas-bestos one which is in ok shape and works for the smog man, but only one bolt hold it on, and barely.
The $35 hose that's still available is also available in generic form for about $2.

Ed, where can you buy a generic HAI hose? Is it basically the same thing (spiral metallic wound) or is it something like a rubber hose from an auto parts store?

 

[Output Shaft]

The unobtainium front manifold insulator is only kinda useful for the first few minutes after starting a cold engine on a cold day. Once the engine thermostat opens and warm air from the radiator gets pulled into the engine compartment from the fan, the front manifold insulator no longer has any purpose.
===

On a FJ60 (I know, not a FJ40) the HAI flapper valve in the air cleaner neck is controlled by the Hot Idle Control Valve (HIC) located inside the 2F air cleaner cover. The HIC very slowly opens and closes the HAI valve attempting to regulate the air temp going to the carb between 81º and 91º F.
In 1986, this was Toyota's best solution for supplying the optimum air temp to the carb for what they wanted to do.

With the front manifold HAI (unobtanium) insulator installed correctly, the air cleaner gets super heated air from around the manifold mixing with the cooler air coming in from the outside, resulting in a net air temp mixture of approx 81º to 91º F going to the carb.

That is all the carb needs, according to Toyota's 1986 spec... a minimum of 81º F.

Once the engine has been running for a few minutes after startup, depending on how cold it is outside, the air temp inside the engine compartment warms above 81º (which is the minimum temp range of the HIC) and the air sucked out of the bottom of the HAI valve, without the benefit of a manifold insulator connected, is plenty warm to do the deed that needs to be done.