picked up a 12ht. Questions

[roscoFJ73]

Originally Posted by AGreekBoy

hey guys what are all the wires on the transfer case and where do they go. i know one is the reverse light, the other for the 4wdrive what are the othere ones for.?

From memory ,the transfer case with the vac shifter has some extra wiring to activate 4WD if you shift into low range manually.

On the manual shift t/case it you have to shift into 4WD before you can shift into low range.

[AGreekBoy]

i bought the vsv switch for the transfer case and the interior switch anything else needed.?

[Creeker]

Originally Posted by AGreekBoy

not trying to sound stupid but what do i need. how do i mount the resorvoir to the fender. and what kind of lines to the pump?

If you need new lines, it might be cheaper and easier to have a hydraulic shop fabricate new ones. Make a template or bribe the hydraulic guy to come out and look. The twists and turns all have to be in the right places. My hose burst and SOR was asking an astronomical price for a replacement; a shop fixed it up for ~$100 and 2 days work.



The reservoir (not OEM) says Power Steering fluid, but that's not right. Search for the board's rec's.



BTW - the PS lines run between the frame and the radiator. It's a PITA to bolt down when the radiator's in place...

[AGreekBoy]

Creeker, do you have a gas engine or a diesel?

[Creeker]

Originally Posted by AGreekBoy

Creeker, do you have a gas engine or a diesel?

I have a 12HT dropped into an FJ62. I didn't do the work myself, but have had to do some wrenching on it so I'm slowly learning whats what. I have a couple of diesel issues I'm trying to resolve:

1. Low oil pressure
2. No tach (the gas engine tach doesn't work w/diesel)

I'm picking up some tips from your thread. Good stuff!

[AGreekBoy]

i converted my fj40 with a 3b, used the gas wiring harness and my oil pressure reads low to. i know that the oil pressure is lower in the deisel than the gas and think that the gauge from the gas wiring reads incorectly because my motor is fine.

[AGreekBoy]

Creeker are you running an electric fan? if so what kind did you use?

[Creeker]

Originally Posted by AGreekBoy

i converted my fj40 with a 3b, used the gas wiring harness and my oil pressure reads low to. i know that the oil pressure is lower in the deisel than the gas and think that the gauge from the gas wiring reads incorectly because my motor is fine.

I thought this might be the problem. I need to check the pressure per the manual, and change out the guage if needed. My concern is that even if the gauge isn't calibrated, the pressure starts high then drops after the engine warms up. I don't know if that's normal.

[Creeker]

Originally Posted by AGreekBoy

Creeker are you running an electric fan? if so what kind did you use?

Yes. I'll check tonight if I get a chance and take some pics.

[Tapage]

Originally Posted by Creeker

I thought this might be the problem. I need to check the pressure per the manual, and change out the guage if needed. My concern is that even if the gauge isn't calibrated, the pressure starts high then drops after the engine warms up. I don't know if that's normal.

The numbers are the key .. certanly the diesel have less oil press than gassers in some case, but in a turbo diesel engine it's more related to the oil seals in the turbo .. ( blowing due high oil press )

The 12H-T as same as the 1HD-T engine need ( by Max Ellery manual ) at least 4.3 PSI at idle .. ( 650 rpm ) and 36 PSI or more @ 3000 rpm .. all measurement sure @ normal operative temp.

[Creeker]

Originally Posted by Tapage

The numbers are the key .. certanly the diesel have less oil press than gassers in some case, but in a turbo diesel engine it's more related to the oil seals in the turbo .. ( blowing due high oil press )

The 12H-T as same as the 1HD-T engine need ( by Max Ellery manual ) at least 4.3 PSI at idle .. ( 650 rpm ) and 36 PSI or more @ 3000 rpm .. all measurement sure @ normal operative temp.

Tapage - thanks for the info. According to this, it looks like I have a problem. The pressure drops off as the engine heats up. I haven't paid attention if it also happens at higher rpms.

So should I check the oil seals in the turbo? I don't suppose there's an easy way to do that...

[Tapage]

Originally Posted by Creeker

Tapage - thanks for the info. According to this, it looks like I have a problem. The pressure drops off as the engine heats up. I haven't paid attention if it also happens at higher rpms.

So should I check the oil seals in the turbo? I don't suppose there's an easy way to do that...

But how are you taking the measure .. ? when you said it drops when the engine get hot, how much is it ? never trust in the factoru gauge ..

I don't think the turbo oil seals are related with the low oil press .. that it's more internal, BEB's oil pump, oil seal front cover etc ..

[Creeker]

Originally Posted by Tapage

But how are you taking the measure .. ? when you said it drops when the engine get hot, how much is it ? never trust in the factoru gauge ..

I don't think the turbo oil seals are related with the low oil press .. that it's more internal, BEB's oil pump, oil seal front cover etc ..

I need to get an external oil pressure gauge and test per the manual. Any suggestions for brand to buy?

[AGreekBoy]

can i reuse my stock gas fuel lines or do they need to be bigger?

[Tapage]

Originally Posted by Creeker

I need to get an external oil pressure gauge and test per the manual. Any suggestions for brand to buy?

I have a full mechanical VDO and other mech/electric from ISSPRO .. both are awesome choices IMOP .. just the ISSPRO more expensive for abetter visibility than the VDO ..

You can see in my sign both threads ..

[roscoFJ73]

Originally Posted by Creeker

I need to get an external oil pressure gauge and test per the manual. Any suggestions for brand to buy?

I was able to rent one for $10 a day ,maybe you have a parts shop that does the same?
Snap On make a nice but they are a $140 or so.
If your prepared to spend money ,you might as well get a full time oil mechanical pressure gauge fitted

[AGreekBoy]

just got my parts together and have one question. would a compressor of an 89 62 bolt to the 12ht?

[RHD Toyota's]

its too bad the air box is on the other side, seems stupid to have two crossover pipes going across the engine head, anyone think it might get heat soaked.

[AGreekBoy]

you can route the lines anywhere you want i was just wondering if the compressor will bolt up

[AGreekBoy]

ok guys started my conversion it is in the 60 section. looking forward to hear from anyone who has done this or has a 12ht. thanks

[panoramic]

A couple notes:
There is a A/C idle boost solenoid that is 24V and must be replaced. I haven't done it yet.
If you don't then the engine either lugs at idle or you have to increase the idle too high to compensate for the A/C use.

I am using used 12V vacuum switches from salvaged 2F smog equipment for my cut-off and it works perfectly and it was FREE! I could have also used industrial Parker switch valves as they are industrial quality, but expensive.

[watrob]

Originally Posted by Creeker

I have a 12HT dropped into an FJ62. I didn't do the work myself, but have had to do some wrenching on it so I'm slowly learning whats what. I have a couple of diesel issues I'm trying to resolve:

1. Low oil pressure
2. No tach (the gas engine tach doesn't work w/diesel)

I'm picking up some tips from your thread. Good stuff!

12h-T & the 2H get low oil pressure if you use to modern oils. Use a old fashion mineral oil 20w x50w with low detergent as the diesel fuel is low sulpher now anyway.

These motors cannot handle oils that become to thin. When you first start up the motor the oil pressure is high and as it becomes hot you notice the oil pressure drops of to nearly nothing.
Use oil that is suited for pre 1990 diesel motors.

The handbook even mentions low oil presssure results from using the wrong oil.

[AGreekBoy]

Panoramic good info thanks

Wartrob ill look at the manual as far for the oil good tip though

[AGreekBoy]

does anyone know where i can pickup a manual for the 12ht? i have the toyota repair manual, but need one for wiring diagram and vacumm line diagram. i found a diagram for vacumm here on mud but it just gives you part #s.

[panoramic]

I have been looking for the wiring & vacuum diagrams for 2 years now. If you come across something PLEASE let me know!

I would think that there is an engine supplement for the HJ61 or 75-series or a coaster bus? Perhaps Roscoe knows?

Fwiw: there are some incomplete diagrams for the Alternator (24/12 & internal/external regulator) and I have pieced together what I feel is the full wiring for my 12V-internal reg. but I have not had a chance to scan the greasy picture pasted to my garage wall yet...

Originally Posted by AGreekBoy

does anyone know where i can pickup a manual for the 12ht? i have the toyota repair manual, but need one for wiring diagram and vacumm line diagram. i found a diagram for vacumm here on mud but it just gives you part #s.

[AGreekBoy]

here is something that might help you
http://forum.ih8mud.com/attachment.p...1&d=1219440512

this is all that i could find hope you get more out of it than i do

[panoramic]

Rob,
can you be more specific with the oil type? Perhaps an example of a type from Mobil-1 (they sell down there too, right?)?

Fwiw: For lack of knowledge, I have been using Delo-400 as that is commonly available at the truck stops here when I have been traveling.

- Eric

Originally Posted by watrob

12h-T & the 2H get low oil pressure if you use to modern oils. Use a old fashion mineral oil 20w x50w with low detergent as the diesel fuel is low sulpher now anyway.

These motors cannot handle oils that become to thin. When you first start up the motor the oil pressure is high and as it becomes hot you notice the oil pressure drops of to nearly nothing.
Use oil that is suited for pre 1990 diesel motors.

The handbook even mentions low oil presssure results from using the wrong oil.

[Tapage]

I use 15W-40 Castrol CRB down here .. swtich to 20W-50 in the summer .. but here we pretty hot usually.