Help in 4Wheel for fj 70

[fasker]

hello every one ,
i`m new to this forum and i`m really intrested in this web site , it really helped me in meny things

i have a 1985 FJ70 " Automatic Gear " , i just purchused it .
the 4H is a Bottom switch , and the 4L is lever , when i press the 4H bottom , nothing happened ! still 2 wheel and no sound came that indicate somthing changed in the transfere gear !
someone told me that maybe caused by a fuse or elictrical problem ! even the 4L , when move the lever , the gear changed to the low but still the4 wheel dosn`t move together ! the rear tires slipping in the sand and fron not moving !

any one faced a problem in the 4 wheel ! where are the fuses located in for the 4H ! , and is the 4L also connected to an elictric switch that allow the front wheels move ?!

 

[roscoFJ73]

Hi Fasker and welcome.

Do have the front hubs locked in ? They are not automatic,you have to get out and turn the switches on the front wheels to 4x4.

The 4H switch is activated by vaccum. If the hoses have come off or have holes in them they will not work.
The solenoid switches are on the firewall on the RH side,one is blue,the other a kind of orange.

There is no sound when it changes whilst you are stationary(toyota magic) and some slight noise when moving ,only just audible.

Yes ,the 4L lever should engage 4wd.
Like the button ,it activates the vaccum solenoids on the firewall.

Ive had my FJ73 for 4 years and found the 4wd vaccum system very reliable. Ive only had problems when Ive accidentally knocked the hoses when doing an engine conversion.

 

[fasker]

thanx " roscoFJ73 " for reply ,

no , my hubs locke is automatic , i don`t have the lock switch on it ,
also i inspected last two days for the vacume hoses and the wiring , and i found that one of the hoses is broken , so ill change it , but what i`m not sure about that if these vacume pumps working or not ! , is there a way to find out ? also what i need to know , when i press the 4H bottom switch , should it light ?

what is the problem with the L4 ! it changes the gear to low when i move the lever but still only the rear tires working only ! is it realted to the vacume chambers also ?

please if u can explain the concept of how does the H4 & L4 working ?

the main problem is that all the wiring system is almost " Dead " , i`m not sure if they are working or not !
can the wiring cables found in the toyota spare parts as the originals distrubution and length ?

sorry for this flood of quistions , but i`ll be really thankfull for your answers .

 

[crushers]

take a vacumm gauge and shove it into the vacumm line and sart the engine, you shoudl be showing vacumm...

 

[roscoFJ73]

thanx " roscoFJ73 " for reply ,

no , my hubs locke is automatic , i don`t have the lock switch on it ,
also i inspected last two days for the vacume hoses and the wiring , and i found that one of the hoses is broken , so ill change it , but what i`m not sure about that if these vacume pumps working or not ! , is there a way to find out ?

There is no vac pump ,it uses the vac off the inlet manifold unless it is diesel. Follow the hoses back to the engine.
You can feel the vacuum with your finger or of you have a guage there should be about 6-7 psi
If the H4 switch is working you should be able to swap the vacuum in either one of the 2 hoses that goes to shift mechanism on the t/case

also what i need to know , when i press the 4H bottom switch , should it light ?

Yes ,there is a green light on the dashboard but you also have those electrical problems

what is the problem with the L4 ! it changes the gear to low when i move the lever but still only the rear tires working only ! is it realted to the vacume chambers also ?

It could be lack of vacuum or it could be your front hubs are not engaged. You cant turn the front driveshaft by hand when the hubs are locked and it is in 4H

please if u can explain the concept of how does the H4 & L4 working ?

You have a 2 speed transfer case.
When you push the button it activates the shift mechanism,which engages the front drive shaft ..
If the front hubs are not locked the driveshaft will turn ,but not the wheels.

the main problem is that all the wiring system is almost " Dead " , i`m not sure if they are working or not !
can the wiring cables found in the toyota spare parts as the originals distrubution and length ?

Why is it almost dead? Fuses ,burnt out wiring?.
The wiring cables can be replaced with any wire of the same length ,thickness.
Try to keep the same colour for future reference.
Buy a manual for the diagrams

 

[Ron R]

thanx " roscoFJ73 " for reply ,

what is the problem with the L4 ! it changes the gear to low when i move the lever but still only the rear tires working only ! is it realted to the vacume chambers also ?

please if u can explain the concept of how does the H4 & L4 working ?

Maybe it's a bit overdone in addition to what RoscoFJ73 already said here, but keep in mind that when you press the 4WD button you are switching (electrically) two valves. These valves, by means of vacuum, engage 4WD. Press again and 4WD is disengaged.
When 4WD is not engaged by the button, but you select 4WD through the lever on the gearbox (more precise: the transfer) then two things happen:
1. The transfer switches from hig-ratio to low ratio;
2. The same system as activated by the 4WD-button is now activated through a switch on the lever, that electrically switches the two valves...etc.

have fun,

 

[crushers]

to determine which is acting up, turn the key on, leave the unit in 2 wd and lock the hubs, crawl under and turn the drive shaft, it should not turn.if it does then the elec locking hubs are acting up
fire up the truck, unlock the hubs push the 4H button,shut the truck down, crawl under and turn the drive shaft it should not turn. if it does then the t/case is acting up.

 

[fasker]

roscoFJ73 ,
befor one month i did replce the engine with a 1991 3F engine , so when i was trying to follow the vacume hoses that going to the engine , then i found that the hose is disconnected and there is no place in the engine for the hose, so can u tell me the hoses connection points ? is there a manual for the 3f engine on the net ? i searched but didn`t find one !
also , can i use other vacume solenoid rather than mine model bcz i didn`t find it in the dealer!? i mean can i use the fj60 or recent fj70 models ?

and by the way , can the new fj70 models manual transmition be installed in my 1985 fj70 ? what is the best gear model ?

i`m really thankfull for u`r help

ur`s fasker

 

[roscoFJ73]

roscoFJ73 ,
befor one month i did replce the engine with a 1991 3F engine , so when i was trying to follow the vacume hoses that going to the engine , then i found that the hose is disconnected and there is no place in the engine for the hose, so can u tell me the hoses connection points ? is there a manual for the 3f engine on the net ? i searched but didn`t find one !
also , can i use other vacume solenoid rather than mine model bcz i didn`t find it in the dealer!? i mean can i use the fj60 or recent fj70 models ?

and by the way , can the new fj70 models manual transmition be installed in my 1985 fj70 ? what is the best gear model ?

i`m really thankfull for u`r help

ur`s fasker

The vaccum can come from anywhere. Mine came from the the manifold about 60mm from the brake booster hose.
The thin hose in the pic was the solenoid hose on mine
Maybe you could put a T piece from the brake booster vaccum.
No 3F manuals on the net.
http://www.birfield.com/ have some 84-90 body chassis manuals for the 60 which is nearly the same a s a 70
A 60 series solenoid or any other landcruiser will do. Some have used solenoids from Toyota cars but I dont know which part or car.

The new 70 are called FZJ70 with the 1FZ FE motor and the gearbox will not fit the 3F.It maybe possible but would require a lot of work.
The 5 sp gearboxes from 84-92-3 were all H55f with the same ratios.
There a is a t/case with a low ratio of1:1.9 and one with a low ratio of 1:2.3

 

[fasker]

hi again ..
thanx roscoFJ73 for your help ,

this is what i did last two days ,
1- i replaced the solenoid bcz one of the old solenoids was broken , before that i tested them and they work well .
2- i checked the wiring for the 4H bottom , there was broken wire , i replaced it .
3- i installed the vacuum hose to the manifold .
4- i replaced the relay for the 4 wheel solenoid

so all the connections now ready to shift the front shaft , so i turned on the engine and pressed the 4H bottom , the solenoid works , and i can hear the sound of the vacume , but now the problem i think from the "diaphragm " , i think bcz it was not used for a long time , it need to be lubricated .

any suggestions?
by the way , i went to the Toyota dealer , and they said they don`t have a kit for the diaphragm !

if there is no way to solve this problem , can i change the electrical type shifting into manual shifting , replace the diaphragm with a lever!

 

[roscoFJ73]

so all the connections now ready to shift the front shaft , so i turned on the engine and pressed the 4H bottom , the solenoid works , and i can hear the sound of the vacume , but now the problem i think from the "diaphragm " , i think bcz it was not used for a long time , it need to be lubricated .

any suggestions?
by the way , i went to the Toyota dealer , and they said they don`t have a kit for the diaphragm !

if there is no way to solve this problem , can i change the electrical type shifting into manual shifting , replace the diaphragm with a lever!

Im not sure which country your in but the vaccum shifter is fairly common and the dealer should be able order a kit for you.
Can you try another dealer or find another vaccum shift from a wrecker?

You can convert to manual shift using toyota parts but you have to dismantle the t/case and swap the front half of the casing for one of a manual t/case. You also need all the linkages and shifter.
It would much easier to repair the vaccum shifter. Generally it is very reliable.

If you remove the vac shifter you maybe able to pull or push it into 4x4 but some oil may leak out if the O ring is worn.
It is just a shaft that moves back and forward.
Also,if you drive very slowly and push the button it may work.

 

[fasker]

finally it works !!

today while i`m in my way to the mechanic to check the transfer " after i gave up" ,
the 4WD drive light turned ON on the dashboard ( it turned on while the 4H bottom is off , bcz the hoses are replaced ,i corrected them )
now its working well .
thanx to all those who helped me " specially roscoFJ73 "

yours ..
fasker from kuwait
.

 

[Ron R]

finally it works !!

today while i`m in my way to the mechanic to check the transfer " after i gave up" ,
the 4WD drive light turned ON on the dashboard ( it turned on while the 4H bottom is off , bcz the hoses are replaced ,i corrected them )
now its working well .
thanx to all those who helped me " specially roscoFJ73 "

yours ..
fasker from kuwait
.

Boy, is he happy!!! Congrats...!!!

 

[roscoFJ73]

finally it works !!

today while i`m in my way to the mechanic to check the transfer " after i gave up" ,
the 4WD drive light turned ON on the dashboard ( it turned on while the 4H bottom is off , bcz the hoses are replaced ,i corrected them )
now its working well .
thanx to all those who helped me " specially roscoFJ73 "

yours ..
fasker from kuwait
.

Good news Remember if you ever have a problem with it getting stuck in 4H,you can sometimes fix it by swapping hoses over .On becomes off,Off becomes on