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  • Diff Breathers

    Hi All,

    I fitted extended diff breathers on Saturday. If anyone is thinking of doing it, don’t be afraid – it really is as easy as others have made out.

    It might be a very good idea to do it, too, because when I freed off my standard rear breather (after a liberal douse of WD40), there was a “pffff” as pressure was released – the breather cap was sort of welded/corroded sealed to the nut part.

    I think this means the rear diff hadn’t been breathing for quite a while. I put the breather back in after checking the pitch, and when I took it out again to fit the new union, there was another “pffff”.

    Anyway, I got 2 brake line unions from a motor shop, some clear plastic hose (turns out I didn’t need 5 metres after all… ) and 4 small hose clips, all for about €20.

    The thread pitch of the new unions wasn’t correct. When I held old and new together, the threads were out by a about half a thread over 5 threads or so. I carefully wound the new union in, anyway. It was a little tight (and got tighter as I turned), but it did go in with about 5 full turns. It’s definitely sealed, and I’m sure that I’ll be able to get it out and the original back in if I have to.

    For the rear, I ran the hose along the LSPV pipe with one cable tie, leaving a little slack, then up the fuel filler pipe and secured with another cable tie, again with a little slack.

    I took the plastic fuel filler surround off so I could get in and secure the hose and route it out under the rear right wheel arch. I had to cut a little slot out of the surround to get it back on, but you’d barely notice that.

    For the front, I ran the hose up over what I think is the front drive shaft and over the steering shaft, and cable tied the end to a bracket near what I think is the brake fluid reservoir. The hose touches the bottom of the engine/transmission, so I wrapped a few turns of duck tape around the hose where it touches, in the hope that the hose won't melt through.

    I haven’t fitted filters to the ends of the hoses yet, but I will. I also bought new oils for the diffs, but didn't get round to them.

    Actually, it'd be great if someone could confirm that I got the correct oils - Extreme Pressure 80W90 for the rear (I'm told this is called "hypoid"), and semi-synthetic 75W90 for the front.

    Really easy, and really cheap. Makes me feel that little bit closer to being a real off roader now… Just have to save for the ARB snorkel now… And what’s white grease?

    Mark
    Attached Files
    :

  • #2
    try jacking the rear up so the suspension is fully extended on each side and in the middle, just to check there's enough slack on the rear pipe.... doesn't look like alot.
    nee nar nee nar, i'm a fire engine!

    Comment


    • #3
      I'm a paranoid git and reckon that your cross meshed threads wont seal and you should worry that one day you might be a paranoid git too ......



      Comment


      • #4
        don't get us wrong and think we're critisising... just constructive comments... cos i hate it when that happens...


        although jim's probably dissing it big time!! hehehe!!
        nee nar nee nar, i'm a fire engine!

        Comment


        • #5
          JimL,

          Is there a way I could check they're sealed (without driving through water and then finding out my diffs are full of emulsion)? I did turn each union backwards till I felt the threads align before I turned them in. I'm pretty sure I didn't cross thread (lil ol' optimist me, eh?), more like spread the existing threads a little. Anyway, if I can get unions with the exact same threads, I will replace them. Have you done this? If so where did you get the unions? You are in Meath, Ireland, right?

          Dabigman,

          Thanks for that - I'll check the axle drop when I get home this evening. I do have loads more hose left, so I can fit a longer one if I have to. Is it better to not secure the hose anywhere between diff end and exit end?


          Don't worry about the comments - wouldn't you rather someone put you right than let you suffer?

          Mark
          :

          Comment


          • #6
            Originally posted by silvtr1000
            JimL,

            Is there a way I could check they're sealed (without driving through water and then finding out my diffs are full of emulsion)? I did turn each union backwards till I felt the threads align before I turned them in. I'm pretty sure I didn't cross thread (lil ol' optimist me, eh?), more like spread the existing threads a little. Anyway, if I can get unions with the exact same threads, I will replace them. Have you done this? If so where did you get the unions? You are in Meath, Ireland, right?

            Dabigman,

            Thanks for that - I'll check the axle drop when I get home this evening. I do have loads more hose left, so I can fit a longer one if I have to. Is it better to not secure the hose anywhere between diff end and exit end?


            Don't worry about the comments - wouldn't you rather someone put you right than let you suffer?

            Mark
            Have a search, the correct p/n has been posted before along with pictures. You mentioned a release of air when you removed the original caps, its safe to assume therfore that you don't have any leaks in the casing, to test the seal of the union you could therefore blow down the tube you fitted and use a little soapy water to check for leaks around the fitting. Before doing so be aware however that the casing is not meant to be pressurised, so dont use any form of pump or airline or you could damage seals, you really only need 1 or 2 psi to check, about as much as your lungs can provide should be more than adaquate.
            Maurice
            Hilux Surf FAQ at www.hiluxsurf.eu

            Comment


            • #7
              Call me a nerd, but I love these little tips. I know they're just canny common sense, and sometimes I even come up with them myself, but I do get excited about them.

              My blow should be sufficient - in science class in first year, we did an experiment where we had to blow into a bottle of water to disperse some of that water into another bottle. I displaced 550cc of water - officially the biggest puff in the class. I learned that if you ignore slagging, the slaggers will get bored and stop slagging.

              Cheers, Morr.

              Mark
              :

              Comment


              • #8
                officially the biggest puff in the class.


                hehehe! now theres a boast not many would make!
                mudnstuff.me.uk

                Comment


                • #9
                  Just had a look at your pics and things seem a little dry underneath - would do no harm in giving her a good underseal before Mr rust does too much damage - did mine about 3 weeks ago and used 12 cans of underseal with added wayoyl + it looks the bizz too...

                  Comment


                  • #10
                    Ironic you should comment - that's my next job. When I did the exhaust two Saturdays ago (http://www.yotasurf.co.uk/forums/showthread.php?t=7359), all I'll say is thank you to whoever it was that advised me to wear goggles... It was a Northern Irish car, so would have been subjected to road salt.

                    There were flakes coming off here and there, so I will be asking for all and any advice going soon.

                    Mark
                    :

                    Comment


                    • #11
                      Originally posted by silvtr1000
                      ..... It was a Northern Irish car, so would have been subjected to road salt. ..
                      Mark
                      Northern Irish vehicles are well known here in the south for their rust accumulation, thankfully our lack of salt does help keep the undersides relatively ok.
                      I'm sure even if the councils here did use road salt it would not be too much of a problem anyway, considering how severe the roads have to get before they consider throwing even a token amount of grit on them!
                      Maurice
                      Hilux Surf FAQ at www.hiluxsurf.eu

                      Comment


                      • #12
                        OH, we only use grit. I thought it was salt. Thats much better!
                        Derek :
                        1990 Hilux Surf SSR Ltd
                        [B][COLOR=DarkOrange][U]S[/U][/COLOR][/B]ave [B][COLOR=DarkOrange][U]U[/U][/COLOR][/B]p [B][COLOR=DarkOrange][U]R[/U][/COLOR][/B]eadies [B][COLOR=DarkOrange][U]F[/U][/COLOR][/B]ast. Cause you're gonna need them!

                        Comment


                        • #13
                          Originally posted by silvtr1000
                          JimL,

                          Thanks for that - I'll check the axle drop when I get home this evening. I do have loads more hose left, so I can fit a longer one if I have to. Is it better to not secure the hose anywhere between diff end and exit end?


                          Mark
                          um... needs to be secured somewhere, just make sure there's enough slack to allow for the axle drop, which is quite a lot on the back!... also moves side to side a bit as it's a solid beam axle.
                          nee nar nee nar, i'm a fire engine!

                          Comment


                          • #14
                            Mark, this part can be got from Toyota, its a surf part just a more recent one. Something to note is that the old breathers I took out were only wound in maybe 3 or 4 times and they were tight. I forgot that when I fitted the new front one and wound it down to the butt but it took a lot of wasted effort.

                            Comment


                            • #15
                              Originally posted by JimL
                              Mark, this part can be got from Toyota, its a surf part just a more recent one. Something to note is that the old breathers I took out were only wound in maybe 3 or 4 times and they were tight. I forgot that when I fitted the new front one and wound it down to the butt but it took a lot of wasted effort.
                              Looking at that union it apears to have a taper thread and is not ment to be screwed all the way down.

                              [SIZE=7][COLOR=YellowGreen][SIZE=5][FONT=Comic Sans MS]The difference between the men and the boys .................... the price of their toys ![/FONT][/SIZE][/COLOR][/SIZE]

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