picked up a 12ht. Questions

[AGreekBoy]

Creeker can you show me a pic of the vacumm lines on your motor and if possible where they attach to vsv for the transfer case.

[Tapage]

12H-T reference pics ..



here start the fun ..



Vacchoses



The last one ..

[AGreekBoy]

Tapage thanks alot . how about the lines that go to the vsv for the 4wd?

[lostworldexpedition]

Originally Posted by AGreekBoy

does anyone know where i can pickup a manual for the 12ht?

There is a 12HT engine manual posted on Master Portal - forums.bauchan.org/Downloads under "Toyota workshop and repair manuals". The site is hosted by a MUD member. I have not downloaded it yet so I cannot tell you how good it is or if it is not the same repair manual you already have. Hope it helps.

[AGreekBoy]

Originally Posted by lostworldexpedition

There is a 12HT engine manual posted on Master Portal - forums.bauchan.org/Downloads under "Toyota workshop and repair manuals". The site is hosted by a MUD member. I have not downloaded it yet so I cannot tell you how good it is or if it is not the same repair manual you already have. Hope it helps.

tried the link and got nothing.

[panoramic]

I believe the larger images are actually torrent keys. Once you download the link, you still need to run BitTorrent or Nutella or Limewire, etc..etc...

Anyway, the manual is great for mechanical details (engine teardown, FI Pump etc).
But it contains almost NO electrical information (such as the tach) or info on the VSV solenoids. It also lacks a detailed vacuum hose schematic.

[troopie]

The only place one can find a diagram of the vacuum hoses is in the EPC or just the poor boy paper parts catalog.
I too had a lot of trouble hooking all of that stuff up. I bought my engine without vacuum hoses, starter and so on.

HTH.

Mark

[panoramic]

Mark,
did you end up writing down somewhere what each vacuum / electrical device does on the engine? Perhaps you annotated the
vacuum parts diagram?

There are a few things I still do not have explained:
a) A few unconnected sensors on the plate behind the injection pump
b) An explanation of how the 'fast-idle' warm-up takes place.
I noticed after I added a vacuum reservoir that this warm-up idle initiates and then kicks-down after the temp increases a bit.

Any of this stuff would be useful to the community!

- Eric

Ps. I still wonder if there is a japanese-only manual with the missing vacuum/electrical information?...

Originally Posted by troopie

The only place one can find a diagram of the vacuum hoses is in the EPC or just the poor boy paper parts catalog.
I too had a lot of trouble hooking all of that stuff up. I bought my engine without vacuum hoses, starter and so on.

HTH.

Mark

[troopie]

Eric,

The fast idle works with a BVSV, a bi-metal vacuum switching valve. The thingie in the alloy oil cooler cover where two vacuum hoses connect. When the coolant is cold, the BVSV is open and will let vacuum thru, which actuates a vacuum box (don't know the english word) which has a rod and that pulls on the accelarator lever on the injection pump. It's adjustable so you can set it to a higher or lower idle speed. I infact went creative and fitted an extra vacuum solenoid in that system so i have high idle with the flick of a switch on the dash. Really handy when offroading. No more tricky throttle with that mod.

On your question on the connections on the plate behind the pump. One is that BVSV for the fast idle.
The other one is probably the square green connector. Thats for the glow system control. It senses the coolant temprature and adjusts the glow time according to that temp. I never hooked up the glow system so it sits there useless.

I have never written down anything where the hoses connect. I just went to the local Toyota dealer and asked for a printout of the EPC. Hooked it all up and was done with it. Yes buy a lot of parts and they will do that for you! Hell i even get to use the computer without them being around.

BTW. don't mistake the hose from the intake runner to the injection pump for a vacuum hose. There is boost to tell the pump to inject more fuel. Very important

HTH.

Mark

Originally Posted by panoramic

Mark,
did you end up writing down somewhere what each vacuum / electrical device does on the engine? Perhaps you annotated the
vacuum parts diagram?

There are a few things I still do not have explained:
a) A few unconnected sensors on the plate behind the injection pump
b) An explanation of how the 'fast-idle' warm-up takes place.
I noticed after I added a vacuum reservoir that this warm-up idle initiates and then kicks-down after the temp increases a bit.

Any of this stuff would be useful to the community!

- Eric

Ps. I still wonder if there is a japanese-only manual with the missing vacuum/electrical information?...

[panoramic]

Mark,
this all does help alot! I haven't hooked up the A/C VSV and I think it does the same thing as the extra valve you added - boosts throttle when the A/C is on. I really liked your idea of adding a 'Fast-Idle' switch at the dashboard - easy to install and I wish I had thought of it!

I did notice the line which looked like a boost line - until now I wasn't aware of it's purpose. How do you know if the fuel boost is set correctly? I guess a Air/Fuel gauge mounted on the Turbo downpipe?

Thanks again,
Eric

Originally Posted by troopie

Eric,

The fast idle works with a BVSV, a bi-metal vacuum switching valve. The thingie in the alloy oil cooler cover where two vacuum hoses connect. When the coolant is cold, the BVSV is open and will let vacuum thru, which actuates a vacuum box (don't know the english word) which has a rod and that pulls on the accelarator lever on the injection pump. It's adjustable so you can set it to a higher or lower idle speed. I infact went creative and fitted an extra vacuum solenoid in that system so i have high idle with the flick of a switch on the dash. Really handy when offroading. No more tricky throttle with that mod.

On your question on the connections on the plate behind the pump. One is that BVSV for the fast idle.
The other one is probably the square green connector. Thats for the glow system control. It senses the coolant temprature and adjusts the glow time according to that temp. I never hooked up the glow system so it sits there useless.

I have never written down anything where the hoses connect. I just went to the local Toyota dealer and asked for a printout of the EPC. Hooked it all up and was done with it. Yes buy a lot of parts and they will do that for you! Hell i even get to use the computer without them being around.

BTW. don't mistake the hose from the intake runner to the injection pump for a vacuum hose. There is boost to tell the pump to inject more fuel. Very important

HTH.

Mark

[troopie]

Eric,
An air/fuel gauge won't work with a diesel engine. It's a gas thing only. The easiest way to test the boost compensator is to pull of the hose of the pump and take it for a test run. If there is noticably less power than with the hose hooked up, the boost compensator works. There is a way to increase the amount of fuel injected under boost, but you'll definately need the FSM for that. It's just a little to complicated to write down here.

Mark

Originally Posted by panoramic

Mark,
this all does help alot! I haven't hooked up the A/C VSV and I think it does the same thing as the extra valve you added - boosts throttle when the A/C is on. I really liked your idea of adding a 'Fast-Idle' switch at the dashboard - easy to install and I wish I had thought of it!

I did notice the line which looked like a boost line - until now I wasn't aware of it's purpose. How do you know if the fuel boost is set correctly? I guess a Air/Fuel gauge mounted on the Turbo downpipe?

Thanks again,
Eric