Rear Diff breather mod, improved

[anestech*]

I followed this write up http://www.yotatech.com/~corey/tech/jackson_breather/breather.htm and added a little impovement. I removed the plastic piece that surrounds the filler neck (black thing in the pic) and drilled a 3/8" hole in it near the filler neck, pushed the breather plug through it and pushed the hose onto it and hoseclamped it in place. Screwed it back in, and viola, a TOTALLY protected breather plug.

http://members.cox.net/romara2/Pics/diffbreather.jpg

[zosimov21]

Will the fumes from the gas up affect this mount in anyway? I snaked mine up under the wheel well between the metal and the plastic? cover under the wheel well.

[AZTaco]

That's where the article tells you they placed the breather, in the filler area. I'm just getting my 1 post/month, not picking on you.

I just did this mod as well since the last few times I've been offroad I travesed some deep water. The first time was at Lake Powell launching the SeaDoo's. Damn near had my bed in the water. The last two times was Charalou Gap here near Tucson. I ran the hose to my engine compartment and put a Fram fuel filter on the end for a true open breather. Others on here have suggested the same thing.

Seems kinda odd 2 people from the desert doing this mod. We should be doing catcus needle tire mods or something.

[ThePinkTaco]

Thats what i did with mine the only problem was the lock hit it. It didnt work anyways so i bought a spring and im going to smooth out the hole.

[anestech*]

Seems kinda odd 2 people from the desert doing this mod. We should be doing catcus needle tire mods or something.

I'm not from here, and I'm headed to Seattle in 7 weeks. ;)

And that article did put in near the filler, mine is just a cleaner excecution of it.

And I was careful to chose a location that it wouldn't hit, and my truck doesn't have the locking fuel door (which is see as a double edged sword).

[ShowStop]

Cool, thanks for posting that. I need to do that mod before the boating season this year.

[obscurotron]

Exactly what I did a few months back. I took it one step further and secure the breather in place, to the black plastic trim, with a little dab of JB Weld. Hopefully it'll never ever rattle. :)

[seth_js]

Is fuel line a standard size? If not, what size should I get for this?

-Seth

[zosimov21]

Is fuel line a standard size? If not, what size should I get for this?

-Seth

Parts/Materials Needed:

1 Toyota part number 90404-51026 Listed as a "Union" at a cost of $4.19 in January of 2002.
8 feet of 1/4" rubber fuel line
2 small hose clamps
A few nylon wire (zip) ties

[seth_js]

Yeah... saw that after I posted. :p

In some write-ups, the union is listed as 90404-51319. And in others it's listed as 90404-51026. Is there a difference?

-Seth

[zosimov21]

Dunno they are both listed as union according to a part number lookup however one costs more

http://www.trademotion.com/partlocator/index.cfm?action=searchCatalogOEM&siteid=214074

[Paul]

There's a good write up on it. http://www.wattora.com/mods/diffbreather/

[seth_js]

Ok... so I just got the parts for this. I ordered the breather plug and union fitting from the stealership... then swung by Checker and got 6ft of fuel line and some hose clamps. The only 1/4 inch line they had was some high pressure line, or so they said. It's pretty thick. And it was a little more money then the standard stuff (I paid 14$ for 6ft.) I was too lazy to go somewhere else, so I just bought it. If it really is high pressure line, and is thicker then regular line, it won't make a difference, will it?

-Seth

[AZTaco]

No difference. The thicker stuff just made it harder for me to route. It was all wound up and hard to keep unwound.

[hytenor]

Yeah... saw that after I posted. :p

In some write-ups, the union is listed as 90404-51319. And in others it's listed as 90404-51026. Is there a difference?

-Seth

I believe one is straight and the other has a right angle to it.

[SAR_Squid79]

7-20-05
FYI - I just bought the "Union Fitting" yesterday from my local Toyota Dealership (90404-51026) and the total cost was $7.60 (w/ CA sales tax).

The mod took me about 15 minutes. I ran it in to my gas door like in Anestech*s pic above.

[TACODOC]

Does anyone know if this fits the 05? (puts on fire suit...)

[hytenor]

Does anyone know if this fits the 05? (puts on fire suit...)

it should, the rear 3rd members are supposed to be the same.

by the way, Nissan has the same part for about half that price posted ;)

[zosimov21]

it should, the rear 3rd members are supposed to be the same.

by the way, Nissan has the same part for about half that price posted ;)

Nissian and Toyota 3rds are the same? WTF Yoda Rules!

[hytenor]

Nissian and Toyota 3rds are the same? WTF Yoda Rules!

no doofus...the union for the breather extension, sheesh.

[wave]

I recall reading about a even better solution. it was a little plastic piece that worked like an accordian, when the air in the diff gets hot and expands the thingy expands. the best part is no water can get in no matter how deep you go (In theory). the only draw back i could see would be when draining the diff suction might be a problem. but this shouldn't ever happen, always remove the fill plug FIRST just in case it decides to strip. i learned my lesson the hard way.

[TacoDell]

WTF... If yer going to offer something to this old ass thread... at least have some pics or a link to the mythical creature you speak of... :rolleyes:

[Texan1983]

i have seen it to, it is in 4wheeldrive mag. but i couldn't find the artical right off the bat. it's a neat idea, it's just a black accordian thing that sits on the breather hole. it's supposidly completly sealed so no dust even gets in. i have thought about it but it hard to find it and i got to thinking that going through deep mud or water would have enough resistance to pull it off because i really just claps on top and sits on the axle and expands up and down with the pressure/heat.

[Intrepid]

So explain to me how this magical device works, it seems like it does the same thing the original breather did, when there is pressure and heat that needs to be released, it opens, how does water not get in at this point if you are sitting in a puddle?

[Toyo4x4]

Are there any links to the fuel filter that attaches on the end? Pictures or part #? I need to do this, and I plan to just run the breather all the way into my engine bay.

[TacoDell]

Are there any links to the fuel filter that attaches on the end? Pictures or part #? I need to do this, and I plan to just run the breather all the way into my engine bay.


er... Pep Boys... But I'm a cheapskate so I just re-used the breather that came off the diff... It was tight as hell getting it into the end of that hose though... ;)

[Toyo4x4]

er... Pep Boys... But I'm a cheapskate so I just re-used the breather that came off the diff... It was tight as hell getting it into the end of that hose though... ;)

Yep, dumb question, found what I was looking for. No thanks to you :p

[tacotoy]

oil breathers........ i would think that those fit

[Texan1983]

Intrepid,
it doesn't open at all... the best i can explain it is like a ballon inflating with the pressure and contracting when it cools. it's fully sealed all the time. just let the gasses expand and contract.

[TacoDell]

Yep, dumb question, found what I was looking for. No thanks to you :p

You must of read my quote from "The Dick"... Can't hold yer hand for everything...:p

[Cdshot10]

Whats the deal with people saying they used a fuel filter in place of the breather when they extended it?

[Maxwell]

Whats the deal with people saying they used a fuel filter in place of the breather when they extended it?

Bump, I'm not quite grasping the role of a fuel filter here, either. Looks cool, I'm sure, but it doesn't seem like that air would really need to be filtered. What am I missing? :confused:

[Maxwell]

Ok, so I found this explanation on the WATTORA site:

http://www.wattora.com/mods/diffbreather/

In short, it just allows more flow than the stock breather so the pressure in the diff remains neutral. But why not just leave the end of the hose open? Especially if it's clear up under the hood? Does a fuel filter (something that is built to allow fuel to pass through) really keep any water out?

[RedRunnertc]

I think the idea is to catch the oil vapor coming OUT of the diff, and I guess eliminate the possibility of anything getting in and contaminating your oil.

I'm with you though - after going through 6' of small tubing, isn't most of the oil vapor going to be condensed on the wall of the tube? And won't anything that gets "sucked" down there get trapped in said oil?

[thebeast8888]

damn i still need to do this to my 85...

add it to the list

[darwink1]

k ran mine to the engine bay and mounted it right beside the front diff one. then i looked at the completed job and remembered gettin my friends pathfinder stuck off camber in a deeeep mud hole with a lot of water, drivers side fender partly submerged. hmmmmm................. went to parts place to get 2 unions and more hose to extend them both a bit more and just my luck only 1 1/4 " fitting left. ill take pics when i get em relocated further up the inner fender.
by the way where do the transf case and trans? vent to? should we be extending those too?

[CWest]

Here's mine...

Cheap ass way a few months back...

http://i48.photobucket.com/albums/f218/jeepmox1/4c6ba887.jpg

fixed to the right way a few weeks ago....

http://i48.photobucket.com/albums/f218/jeepmox1/zz.jpg

[jester_motorsports]

90404-51319 is straight

90404-51026 is a right angle


Just checked with Jacque.

[toyotateen]

is the Rear Differential the only place that this needs to be done or are there other breathers that this mod should also be done to.

[Rivethed]

front differential, transfer case and manual trans also, if you plan deep fording (with a snorkel of course).

Front and rear differentials are most common as they see the most submersion.

[hytenor]

is the Rear Differential the only place that this needs to be done or are there other breathers that this mod should also be done to.

the front diff breather is already raised up into the engine compt.
the tranny and tcase breathers (manual) are located on top of the tranny and if you get stuck that deep (when moving its not so much of a problem) you'll be getting water into your electronics anyway and have much worse problems than a little water in the gearbox ;)

[MountainBiker]

90404-51026 is a right angle
That is good to know! Is the right angle fairly close to the threaded portion?

[jester_motorsports]

That is good to know! Is the right angle fairly close to the threaded portion?

Not sure. I got the straight one.

[purity]

the front diff breather is already raised up into the engine compt.
the tranny and tcase breathers (manual) are located on top of the tranny and if you get stuck that deep (when moving its not so much of a problem) you'll be getting water into your electronics anyway and have much worse problems than a little water in the gearbox ;)
i have 2 breathers already extended into the engine bay. one is the front diff, whats the other? i thought it was the tranny?

[mgyver1]

Trasfer case

[muddybamayota88]

Is there anywhere online to buy the union?

[drabnor]

Is there anywhere online to buy the union?

u try trdparts4u.com? just a thought

[Monoman]

Is there anywhere online to buy the union?
You should be able to get that union at Toyota....That's where I got mine with no problem.... (about 7 bucks)

[4cloud9]

You should be able to get that union at Toyota....That's where I got mine with no problem.... (about 7 bucks)

Man I got two for that price at my toyota parts dept.

[Wgasa84]

Napa has them too.

[jon_7248]

Cant you just loop the hose over a crossmember and tie it facing down? Cause wouldnt physics and all take care of everything? Unless you have a leak some where.. then your hosed anyway (no pun intended)

[Monoman]

Man I got two for that price at my toyota parts dept.
No sh*it!! Looks like I got screwed.... my a$$ hurts now.....

[prezidentredz]

I just poked mine thought were the gas cap is, that way its behind the gas door.

[flataco]

Napa has them too.

Do you know the thread pitch or have a Napa part number per chance? I'd like to do this before this weekend and I know none of my local dealers will have this in stock. Napa would more than likely have a union on hand though.

[purity]

http://www.ttora.com/forum/showpost.php?p=404940&postcount=29

i used this stuff and it turned out fine. i ran mine to the engine bay near the other 2. the whole thing cost me less than $10 bucks and about an hours work. i got the tube and fittings at home depot.

[Wgasa84]

Do you know the thread pitch or have a Napa part number per chance? I'd like to do this before this weekend and I know none of my local dealers will have this in stock. Napa would more than likely have a union on hand though.

I took them my breather and matched it up right there. Not sure on the thread pitch.

[17874]

Looks like a good idea.

[Toxic]

I just poped the cap off the breather then put 1/4 hose with a clamp...Didnt buy anything other than the hose and clamps...I did both front and rear this way...I have the rear running up inside my runner and the front was run to the inside of the cab..I found if you leave them any were else and you go through deep water it will still suck water up in them (not much but some)...When I got my snorkel is when I moved them inside...Money spent less than 4 bucks :D


This is what I play in most of the time cause im in FL Lots of water


an this was me coming out...Water was up on the windows

http://i44.photobucket.com/albums/f40/toxicyota/Boston/DeepwaterSmall.jpg

http://i73.photobucket.com/albums/i240/bosco53/Alexander%20Springs%20campout%20June%202006/P1010072.jpg

http://i73.photobucket.com/albums/i240/bosco53/Alexander%20Springs%20campout%20June%202006/P1010094.jpg

[CWest]

I just poped the cap off the breather then put 1/4 hose with a clamp...Didnt buy anything other than the hose and clamps...I did both front and rear this way...

Thats what I did to the rear like in my previous posts pic, but the hose i put on was huge, and I wanted a smaller one... so i re-did it. :saw:

[SAR_Squid79]

Anybody know the part number for the Diff Breather fitting itself? (NOT THE "UNION")

[hytenor]

Anybody know the part number for the Diff Breather fitting itself? (NOT THE "UNION")

you mean the valve?

[Valkyrie]

Breather Plug (part #90930-03136)
Union fitting (part #90404-51319)

[hytenor]

Breather Plug (part #90930-03136)
Union fitting (part #90404-51319)

took you long enough :p

[Valkyrie]

I was sleepy last night. :D

[santacruzt100]

I just ordered the straight Union Fitting (part # 90404-51026) for $5.73 in CA,
(part # 90404-51319) is $10.83 in CA.....I asked the parts department if one was a right angle and if one was straight and he said both were staight so I ordered the cheaper one.:dunno:

[Cracker]

I just checked the EPC, and all the part #s that have been thrown out are for vacuum ports in intakes. Seems like just about any one of them from just aboot any motor/vehicle should work. I didnt come across any that look to be 90°, but the EPC isnt always that specific as far as the diagrams go.

Incidentally, someone threw out the number 90404-51319, which everyone already has on their Taco. ;)

It is the vacuum port fitting on the intake, where the vac line for the brake booster comes out. :)

The Tacos list two numbers: -51319 and -51273.

I would just try next time yer at the junkyard, check over any Toyota motor, and look for the fittings on the intakes for the power steering and brake booster lines.

Oh, some of these numbers were used on carbed motors back in the 70's and 80's as well as the newer EFI motors.
They were used on the 79-80 20R's, as well as the 22R and RE's, and even the F/2f in the FJ40's & 55's, as well as all the Celicas, some Camry's, the RAV4, the FJ80's, Lexus ES300...A whole bunch of stuff through the years.

Screw paying $7-$11 for one. :)

[Cracker]

Oh yeah, if anyone can post a positive number for a 90° fitting, i can check it to see what applications (vehicles) it was used on.

Also, if anyone wants to check any Toyota motors they have for any large 90° vacuum fittings, I could reverse check that too, to get part numbers.

I want to do my diffs as well as tranny & tcase, and I'm thinking the 90°s would be better for the tranny and tcase. Maybe even use them on the axles, to run the hoses along the housing and zip tie them to run up along the brake hoses for a cleaner install.

[Trick Taco]

To tell you the truth, I didn't have to order anything... I just went to the harware store and bought a 5/16" barbed to 1/8" pipe threaded brass fitting and ran a die backwards on it so it would screw into the diff. Ran 5/16" fuel hose to behing the gas filler and used another 5/16" to 1/8" fitting with a 1/8" coupler to the factory breather. No stretching needed. Pipe thread was extensively used in these connections.

$5 if that...

[codyjh]

a quick shot of mine.

http://i26.photobucket.com/albums/c110/codyjh/DSC02044.jpg
http://i26.photobucket.com/albums/c110/codyjh/DSC02046.jpg

[crawyota]

:doh: MAN I GOT SCREWED ON MY FITTINGS , ORDERED SOME YESTERDAY FROM LOCAL DEALER . PAID LIKE $30.00 , NOW MY ASS REALLY HURTS.
NOW MY QUESTION ARE THE UNION FITTINGS UNIVERSAL TO ALL THE 4RUNNERS..... AND CAN I USE ANY TYPE OF HOSE ??

[hytenor]

:doh: MAN I GOT SCREWED ON MY FITTINGS , ORDERED SOME YESTERDAY FROM LOCAL DEALER . PAID LIKE $30.00 , NOW MY ASS REALLY HURTS.
NOW MY QUESTION ARE THE UNION FITTINGS UNIVERSAL TO ALL THE 4RUNNERS..... AND CAN I USE ANY TYPE OF HOSE ??

yup, pretty much any hose will work with at least a 1/8-3/16" ID.
that thread count/pitch holds for Toyota diffs in general and other Japanese diffs as well.

[Peanut Butter]

Are the breather/union part numbers the same size part for older (ie. 85) front and rear axles? I'm away from the truck, and am in a state with no sales tax, and was hoping to buy the union and breathers here. Thanks!

[hytenor]

Are the breather/union part numbers the same size part for older (ie. 85) front and rear axles? I'm away from the truck, and am in a state with no sales tax, and was hoping to buy the union and breathers here. Thanks!

same 10mmx1.0, yes.
gee...gonna save tax on $4 worth of parts? :rolleyes:

[hockeyplayer4]

i blew my rear end seal cuz of a clogged rear breater. i got all my parts from napa for like..8$. goes up through the gas cap area. got the mod off yotatech 2 years ago. no problems since:D

[Peanut Butter]

same 10mmx1.0, yes.
gee...gonna save tax on $4 worth of parts? :rolleyes:

Haha, yeah, well, it's 2 axles x 2 unions, 2 breathers, fuel line, etc. Saving sales tax on $25 bucks may keep me under the radar with my wife! It's like masterbation, she knows you're doing it, but you're safe as long as she doesn't catch you! :D

[hytenor]

Haha, yeah, well, it's 2 axles x 2 unions, 2 breathers, fuel line, etc. Saving sales tax on $25 bucks may keep me under the radar with my wife! It's like masterbation, she knows you're doing it, but you're safe as long as she doesn't catch you! :D

Ah, so you two are into S&M.




she Sleeps
you Masterbate

:p

[Peanut Butter]

Ah, so you two are into S&M.




she Sleeps
you Masterbate

:p

LMAO!! Too true!! My mistake knocking her up!

[Sucka]

Are you guys actually drilling a hole through the plastic piece around the gas cap and poking it through? I just removed that little plastic piece and zip tied it to one of the fuel lines directly behind that plastic piece. Is that a problem?

I also didn't run a fuel filter in line with the hose, but i've seen that done on a few write-ups, what's the word on that?

And it took about 15 minutes, local Toyota got the part for me in 2 days for like $7 or so.

[hytenor]

Are you guys actually drilling a hole through the plastic piece around the gas cap and poking it through? I just removed that little plastic piece and zip tied it to one of the fuel lines directly behind that plastic piece. Is that a problem?

I also didn't run a fuel filter in line with the hose, but i've seen that done on a few write-ups, what's the word on that?

And it took about 15 minutes, local Toyota got the part for me in 2 days for like $7 or so.

that's all I did.
http://www.norcalttora.com/~chris/mods/Rear%20diff%20breather%20extension/

[Sucka]

that's all I did.
http://www.norcalttora.com/~chris/mods/Rear%20diff%20breather%20extension/

Thanks, i figured it was fine just wanted to see if i was the only one doing this.

I just zip tied mine in line with the filler tube. I also only used 3.5-4' of tube. Left a nice curve in it coming off the diff for flex and then ran it up into the gas cap area, no way you needed 6' to accomplish that.

[Peanut Butter]

Thanks, i figured it was fine just wanted to see if i was the only one doing this.

I just zip tied mine in line with the filler tube. I also only used 3.5-4' of tube. Left a nice curve in it coming off the diff for flex and then ran it up into the gas cap area, no way you needed 6' to accomplish that.

I bought more, just because I wanted to do two diffs (SFA 4 Runner), and run the breathers all the way up into the engine compartment. Now, I'd have to be over the top of the hood to get water sucked into the diffs. And at that depth, the least of my worries would be getting water down the breathers!

[sasaholic]

i did it yesterday, but i got the fitting from autozone and it worked great just threaded it in ran the hose drilled a hole into the filler neck area and put the original diff breather on the end. works good and the autozone fitting was 2.72 just so you guys know

[Sucka]

i did it yesterday, but i got the fitting from autozone and it worked great just threaded it in ran the hose drilled a hole into the filler neck area and put the original diff breather on the end. works good and the autozone fitting was 2.72 just so you guys know

I didn't know Autozone had the part, you should post that part number for everyone else, i'm sure it would be extremely useful for others!

[sasaholic]

im not sure the part number, but all i did was hand them the stock diff breather and told em i needed a union with and open end and they gave me what i needed

[southerntaco98]

i got the union fitting from the local stealership and it was 5 bucks.

i ran my hose along the bottom of the bed and into the cab into my under seat storage in the ext.cab tacos. i also put a lil air filter thing on it to make it a open breather.i love it!!!:cool:

[Dallas]

I just poped the cap off the breather then put 1/4 hose with a clamp...Didnt buy anything other than the hose and clamps...I did both front and rear this way...I have the rear running up inside my runner and the front was run to the inside of the cab..I found if you leave them any were else and you go through deep water it will still suck water up in them (not much but some)...When I got my snorkel is when I moved them inside...Money spent less than 4 bucks :D


This is what I play in most of the time cause im in FL Lots of water


an this was me coming out...Water was up on the windows

http://i44.photobucket.com/albums/f40/toxicyota/Boston/DeepwaterSmall.jpg

http://i73.photobucket.com/albums/i240/bosco53/Alexander%20Springs%20campout%20June%202006/P1010072.jpg

http://i73.photobucket.com/albums/i240/bosco53/Alexander%20Springs%20campout%20June%202006/P1010094.jpg

so do you drive a boat or an suv?

[01 Double Cab]

I just poped the cap off the breather then put 1/4 hose with a clamp...Didnt buy anything other than the hose and clamps...I did both front and rear this way...I have the rear running up inside my runner and the front was run to the inside of the cab..I found if you leave them any were else and you go through deep water it will still suck water up in them (not much but some)...When I got my snorkel is when I moved them inside...Money spent less than 4 bucks :D


This is what I play in most of the time cause im in FL Lots of water


an this was me coming out...Water was up on the windows

http://i44.photobucket.com/albums/f40/toxicyota/Boston/DeepwaterSmall.jpg

http://i73.photobucket.com/albums/i240/bosco53/Alexander%20Springs%20campout%20June%202006/P1010072.jpg

http://i73.photobucket.com/albums/i240/bosco53/Alexander%20Springs%20campout%20June%202006/P1010094.jpg

Man it looks like you wouldn't be #1 on the food chain if you swamped that thing and had to crawl out where you wheel!

[alabamatacomaguy]

a quick shot of mine.


http://i26.photobucket.com/albums/c110/codyjh/DSC02046.jpg

i used an air hose just like the one in the picture a few years back and i somehow got a kink or somthing in the line didnt notice it until i had blown a seal, id check to make sure it hasnt bent over or anything

heres a pic of the kink in the line after i notice the oil comeing from the drum
http://i15.photobucket.com/albums/a353/alabamatacomaguy/breather1.jpg

also saw someone asking about where they raised it to heres a pic of it coming out by the gas tank filler cam
http://i15.photobucket.com/albums/a353/alabamatacomaguy/newb2.jpg

[connor.s]

Does anyone know if this fits the 05? (puts on fire suit...)

yes it fits.. haha i have an 05 taco :D

[cvlighthouse]

Like others, I didn't bother drilling the hole. I just removed the plastic cover and ziptied it to the bed bracket behind on the right.

http://i250.photobucket.com/albums/gg263/cvlighthouse/cheap%20trick/IMG_3641.jpg

My opinion is that it looks better without it there. And you don't have people knocking their knuckles on it and asking, "what's that." I could hear a smog technician asking that...

http://i250.photobucket.com/albums/gg263/cvlighthouse/cheap%20trick/IMG_3646.jpg