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Big Will

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  1. Big Will

    Under seat battery size

    That's a big battery. The 175 width is the key though to getting it clamped down. I didn't think a 354 would fit but great if you can! That said, I have used this car in the Alps in pretty cold weather and haven't had a problem getting it started with this battery which I think is 680cca.
  2. Big Will

    Under seat battery size

    Hi there. Does your iX actually have a battery tray? Mine is mounted directly on the floor and a bracket and bolt hold it down. The key dimension is width for still being able to utilize the factory clamp. Width should be 175mm. I chose a 278 x 175 x175 mm Varta E43. Maximum dimensions that will fit I believe are: 315 x 175 x 190 mm
  3. Big Will

    E34 Gearbox & Diff Oils

    That was a good read. Thanks for linking to it. I had used Redline products on my AWD Volvo wagon in the past. The MTL definitely made an improvement in the shifting for that gearbox but several of my seals began leaking. The MTL was a touch thinner than the stock fluid. I probably should have used the MT-90.
  4. Big Will

    E34 Gearbox & Diff Oils

    I read the links you provided before. I was just noting that most people go with the recommendation to use ATF as far as I know. I haven't read up on the exact specs of how MTF-LT2 compares with Dex II or Dex III ATF but it's certainly plausible that BMW made a decision based on cold shifts etc. That said, I don't think they'd recommend a fluid that risked damaging the gearbox as they wouldn't have wanted to be replacing lots of gearboxes under warranty at the time. Total aside here but I've actually used the LT2 BMW fluid in my Volvo's gearbox simply because it was what I had at hand - identical specs to the Volvo equivalent fluid.
  5. Big Will

    E34 Gearbox & Diff Oils

    I haven't heard of this particular gearbox from ZF using MTF-LT2. RealOEM isn't always correct. Your owners manual should be If it helps, both Liqui Moly and Castrol recommend ATF for this application when you use their selector tools.
  6. Big Will

    E34 Gearbox & Diff Oils

    Your gearbox should have a tag on it saying ATF. I believe the BMW fill was ATF Dex II but most use Dex III now. S5D310Z is the same gearbox used on a lot of e34 and e36 cars. Your owners manual should note the type of fluid. It says ATF in mine. The 75W140 can be used in both the open and limited slip diffs. The LSDs should have a gear oil with a hypoid additive. It doesn't hurt to use this on open diffs it just isn't necessary. Also, there are 75w140 fluids with a limited slip additive and others without...same for 75w90.
  7. Big Will

    E34 Gearbox & Diff Oils

    That should all be correct. You can also use 75w140 if you want for the rear diff.
  8. Hello all, As I continue my quest to get this 525iX touring completely sorted, I'm currently working on solving a strange noise that I first noticed when I drove the car from the dealer back home. At the time, my priority was solving the no-start condition that the car developed on the trip back across Germany (a dead DME). At Autobahn speed (130+ kph) a very strange almost grinding noise would occur from what seemed like directly behind the instrument cluster. It was so constant and didn't really change in pitch but always started around the same speed and was so loud that it would completely drown out the radio! I've attached a video so you can get a sense. While the car was at BMW initially for the starting problem, I mentioned this and they said it was the noisy water valve. This made no sense and of course wasn't the problem. I removed the instrument cluster assuming it would be some broken clips or wires from the harness rubbing on something but driving the car without the cluster made no difference (at least I took the opportunity to change all 23 bulbs) and the cluster itself was in good shape. BMW then gave a shot at test driving it and decided that it was the cruise control cable in the engine bay whacking up against the strut tower because a cable mount was missing. We installed the missing cable mount (12511268352). This did not fix the problem. I continued to trouble shoot until almost by accident I tapped on the cruise control actuator. It was the exact same sound but much quieter (see video attached). I noticed that the 3 nuts mounting the actuator to the bracket were also loose probably from vibration. I replaced the two rubber grommets (37211119643) that dampen the attachment of the bracket to the SLS reservoir in the hope that new rubber would dampen the vibration and then replaced the 3 nuts that attach the actuator to the bracket studs and added some loctite. After a lot of driving, re-positioning the bracket, and re-tightening, the problem is solved. There is literally one orientation of the bracket that seems to keep the vibration to a minimum. However, I know that anytime I have to remove the actuator for any other repair, it will be a lot of effort to get it back into the one position that doesn't vibrate and cause the horrendous noise. I also opened up the actuator and noticed that indeed the noise is coming from inside the actuator itself. You can hear it by tapping on the case. Has anyone ever had anything like this before? Is there a solution other than buying a new actuator or hoping a used one won't have the issue? Also, I ordered a new mounting bracket but the one that arrived doesn't work for the iX because there's a little fuse box that needs to be attached to the bracket and the BMW part no longer seems to have the shoulder to mount it. Does anyone know what the correct part number is for the iX bracket? The number I used was 65711384767. You can see the iX bracket below with the shoulder for the plastic clip to attach the little fuse box. Thanks for any guidance as always! 525iX_noise_edited.m4v 525iX_noise_cruisecontrol_actuator.mp4
  9. Big Will

    Windscreen Wipers

    I don't have the link to the tech note but there is a particular angle (I think it's 84 degrees for the driver's side and 87 for the passenger side) that the wiper arms are supposed to have. There's a procedure that describes using a protractor to measure and then set the angle (carefully with a pair of vice-grips). It may be that the arm's angle is slightly off causing uneven pressure against the glass. Just a thought.
  10. Big Will

    Windscreen Wipers

    That adapter is still available and should be pretty easy to order.
  11. Big Will

    Windscreen Wipers

    I didn't notice that it made much difference on mine when I left it off temporarily. My driver's side wiper judders a lot even when its got a new blade. Maybe it was because I initially used an SWF one instead of a Bosch but I think clay-barring the glass will probably make the most difference.
  12. Big Will

    Battery tray question

    Just thought I'd update this thread. I installed a new Varta E43 680 CCA battery that fits more properly than the enormous one that was in there before. In terms of dimensions, this battery is 278 x 175 x 175 mm. I think the key dimension is the 175 width in terms of being able to access the bolt hole for the clamp. You should be able to fit up to 315 x 175 x 190 mm if you really needed a big battery. Once the new battery was in, it revealed a mounting point for either the rod and bolt style system or the battery clamp. I opted for the latter with part numbers 61211370816 (clamp) and 07119913589 (bolt), and replaced the mucky vent hose with some new tubing. I looked for the access panel for the ground and there appeared to be a plastic cap as described above but at least on my iX it's just a dummy plate that doesn't open. Maybe this wasn't a feature of all models?
  13. Big Will

    Battery tray question

    Thank you. That was very helpful. I hadn't noticed an access for the ground.
  14. Big Will

    Battery tray question

    Hi all, I took a peek at the battery under the rear seat of my iX and noticed that there was no battery tray. The previous owner installed a very large battery but there was no tray and no battery holder to be found. The vent was there thankfully. I noticed that the BMW battery warning label is actually installed on the floor leading me to believe that there never was a battery tray. I'm curious, is that the experience of other iX owners? Did your battery have any kind of mounting hardware to hold it in place? Thanks, --Will
  15. Big Will

    New e34 525iX owner

    I've gone to great lengths for manual gearboxes even importing the proper one from Sweden for my V70 AWD and then swapping it in as the AWDs were only available as automatics in the U.S. (These days I'm in Germany) An Alpina Allrad replica would be pretty neat. I've seen a few originals for sale in Switzerland but their prices are either sky high or the car is in quite a state of need. Cableguy - thanks for the name of the wood trim! I've wondered what the correct name was for it.
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