4wd vacum switch problem...

[BrentC]

what a good and easy to check the vacum from alternator?

thanks

yep, put your finger over end of pipe

[nzdncjw]

thought that was too easy....

thanks

[nzdncjw]

Hey there again!

Still have had no luck! I have had the vacuum tested, no probs there, also checked diffs and hubs no probs there.

It looks to be the solenoid... So 'Jerry' mentioned I could get a mechanical vacuum switch to replace my solenoid... Where do I go to get one for the around a hundred bucks? THEN its just a matter of swapping it over?

OR

I have gotten hold of a 1975ish 40 for nearly nothing... YAH! it has the manual engage system box on it... Now the part where the linkage joins on is different so its unfortunately not an easy bolt off bolt on fix! I will have to pull both boxes out and swap the manual engage part over - bit of a job!

I'm thinking the 2nd method as it is here in my driveway and it will just take a bit of time! (hopefully it stops raining real soon!) At least it will be fixed once and for all that way!

Is there anyone down in the deep south (Invercargill) that is clued up in the fj40 department that I could have a chat too or could come check it out?

Will catch ya later!

chris

[MNC]

...I have gotten hold of a 1975ish 40 for nearly nothing... YAH! it has the manual engage system box on it... Now the part where the linkage joins on is different so its unfortunately not an easy bolt off bolt on fix! I will have to pull both boxes out and swap the manual engage part over - bit of a job!...

Hey Chris, I'm just about to switch from a vacum operated to a manual 4wd actuator.

Haven't got into it yet but have had the vacum unit removed on the transfer case which leaves the same lever as is visable on the manual system. I'm planning on using a manual lever from an older box which I reckon with a little modification will fit in nicely. Should be a bit easer than splitting the transfer case.... although I haven't tried it yet

[Sadam_Husain]

OR

I have gotten hold of a 1975ish 40 for nearly nothing... YAH! it has the manual engage system box on it... Now the part where the linkage joins on is different so its unfortunately not an easy bolt off bolt on fix! I will have to pull both boxes out and swap the manual engage part over - bit of a job!

Your transferbox is a split transfercase which toyota started producing around 1980, all the earlier transfercases are different and you cant swap over the manual engaugement. Have a look at your 1975ish 40 but its unlikely its had a split transfercase put into it

[nzdncjw]

Your transfer box is a split transfer case which Toyota started producing around 1980, all the earlier transfer cases are different and you cant swap over the manual engagement. Have a look at your 1975ish 40 but its unlikely its had a split transfer case put into it

I was wondering that, I haven't looked too hard at the 75ish gear box as since I got it it has been raining! IN SOUTHLAND!!! we haven't had much rain since before Christmas!

[nzdncjw]

Hey Chris, I'm just about to switch from a vacum operated to a manual 4wd actuator.

Haven't got into it yet but have had the vacum unit removed on the transfer case which leaves the same lever as is visable on the manual system. I'm planning on using a manual lever from an older box which I reckon with a little modification will fit in nicely. Should be a bit easer than splitting the transfer case.... although I haven't tried it yet

Sounds interesting.... I have pulled the gear linkage off my older box in the hope I could 'bolt' it onto my truck and go play in the mud.... but no luck! What I found was off the older box the shaft that engages 4wd goes north south on the box on both trucks but the way it is 'shifted' is quite different. On my 1980 box after taking the vacuum system off the transfer case there is a shaft left poking out you can easily engage 4wd with it like that by hand. BUT on the older transfer case that 'shaft' is inside the box and there is a lever at 90 deg to it that swings the shaft in and out of 4wd.

The manual levers will work I think with the high low shifting but the shaft that engages 4wd doesn't line up with the shaft to engage 4wd. I think possibly if I cut the lever and lengthen it to match the shaft out of my transfer case then it could work but there is a problem of the shaft poking out the transfer case that will need to be covered to stop mud and stuff getting into the box.

What had you thought of doing to convert yours? I'll take some photos to explain in more obvious ways of what I found....

Chris

[MNC]

Yeah some modification of the lever system will be required. I'll post some pics when I do it but dont hold your breath as i've got a few other priorities to sort first (like some brakes would be nice ).

[nzdncjw]

I know where you are coming from... I just had to replace my front calipers and had my rear drums all rebuilt... onto the 4wd issue now!

Land cruisers aye!!!

Chris

[nzdncjw]

Thought I would have a look at fitting the manual lever on my truck today.... I took the old lever off my truck, took the lever off the 'parts' truck and also the shaft out the gear box it fits to as they are different lengths... Fitted it to my truck and it works.... the 4wd selector reaches the shaft out the gear box fine (although could be 5mm longer) and I might need to bend it a bit to fit through the factory hole in the gear box cover...

So I can now engage 4wd manually!!! YEAH!! just gotta work out the best way to protect the 4wd selecter shaft from the elements, I am thinking of cutting up the old diaphragm unit to make a cover to bolt on and fit a rubber sleeve to keep the mud and stuff off...

ONLY I now have a problem... when I had the hi low lever off, the shaft fell into the gear box... well just shy of the top of the box (far enough to not be able to get out!) I am looking at taking the back plate off the transfer box - just gotta get a big socket to take the nut off the main drive shaft... hopefully I can push it back up from there - any other ideas? I tried the magnet thing... no luck!

funny part is the hi low box is in neutral! so I can't even move the truck.... luckily it isn't in a bad spot!

Chris

[nzdncjw]

It is finally fixed.... I have successfully converted my FJ40 to Manual Enageing 4wd from Vacuum operated... I now know its in 4wd!!!! very pleased... I kept the original hi low engaging lever and added the older style transfer case parts to mine, cut welded and fitted it back together, I now have two levers, a wee short gear lever to engage 4wd and the original lever to engage hi or low.... Seems to work well....

Thanks to all the help and suggestions!


Chris

[dino]

If your vaccum pump was worn out ,you may also have problems with enough vaccum to operate the brakes.

I have an "82 Fj40 cruiser which has just failed a warrant because brakes are too hard to operate. Mechanic told me he suspected the brake booster was dodgy, but could it be lack of vacuum?? (pulled brake booster off and seemed fine to me).

Any help greatly appreciated.
Cheers.

[largechicken]

Hey all,

Just adding my bit. I had a vaccum issue a few years ago where the truck was stuck in 4wd. Traced it all over 6 months and eventually figured out what was going on. The Vaccum system still works now and just install a switch and switches the pressure from suck to blow and it engages 4wd when needed. Nice and neat. Bizarre complicated system for such an old truck but hey it works.