heater hose connection (1 Viewer)

[mayben1001]

Hello all, My 1976 Bj40 is from Honduras and a heater was not really essential, just an awesome huge speaker in place instead! I live in a colder climate, have purchased the heater, blower, switches, etc... and am now looking at where to connect the heater hose lines? I could buy those radiator hose splicers, or is there a plug right off the engine? It looks like there might be... Any pics... On a side note, is it possible to put in a tachometer in the B engine? if so where..? thanks, cheers. Mayben

 

[Estancio]

Engines should all have places to attacher heater hoses, both in and out. This picture of my 3B engine shows one heater hose coming from water pump which has a partially metal crossover tube running parallel to the engine on the passenger side (above the exhaust manifold). It goes into the fire wall just beside the power steering reservoir. The other hose also goes thru the firewall on the driver side and passes thru a heater control and re-enters the engine block at the rear near the coolant drain plug. I also know there is another place on the front left side of the head that can be used to plug in a heater hose. As has been discussed on another thread, the thread size is 1/2" British Pipe Thread, but it appears to also accept 1/2" US National Pipe Thread fittings. Hope this helps.

 

[lostmarbles]

Hi Mayben

Here's some pics of a 2977cc B-engine....

Heater supply comes from the back of the head as Estancio says:



And the return enters the water pump here (again similar to Estancio's immaculate 3B):



And here is the control valve (operated by the "warm pull" pull-knob on the dash):



And you can fit a tach operating off the flywheel teeth. (Try searching on that.)

 

[mayben1001]

cheers guys that was exactly what I needed! thanks again.

 

[jake2far]

A suggestion, hook up the heater supply hose from the front of the head. The previous post showing the hose fitting at the back of the head is correct per Toyota. I suggest the front of the head because it supplies warmer water and doesn't reduce available volume of water to the head when the heater is on.
On my 3B or 13BT engine there was an unused port on the front passanger side of the head, if you have the same unused port I would suggest you use that one.
Just my opinion and in no way am I saying the other posts are wrong, just a different way to do it.

Jim

 

[lostmarbles]

A suggestion, hook up the heater supply hose from the front of the head. The previous post showing the hose fitting at the back of the head is correct per Toyota. I suggest the front of the head because it supplies warmer water and doesn't reduce available volume of water to the head when the heater is on.
On my 3B or 13BT engine there was an unused port on the front passanger side of the head, if you have the same unused port I would suggest you use that one.
Just my opinion and in no way am I saying the other posts are wrong, just a different way to do it.

Jim

I believe Toyota took it from the rear to provide a good pressure-drop across the heater core(s) (to provide good flow and therefore "effective incab heating") Jim

IMO ...If you take the supply from the front ..... you're really taking it from the pumps "hot water return" (rather than from the "hot water supply" it delivers) ..... so there would be minimal pressure difference between your heaters "supply" and "return" connections this way.



PS. I'm assuming you're suggesting using the unused 1/2" BSP plug just to the left of the big "OUT" port in the front of the B-engines cylinder head in this pic as your "heater supply"

 

[NanoCar]

Impressive.. guess what, I took off the heater hoses and all I got was overflowing heated / evaporated smoke after my vehicle overheated..

That's so stupid of me.. just saying..