Dave7778 Posted August 2, 2015 Report Share Posted August 2, 2015 07 AWD makes a grinding or scraping noise when coasting in gear or neutral, but goes away under acceleration. Brakes are new, bearings are new, transmission is about 35k old. Can be heard best on passenger side. Tires all match and have the same amount of wear. I'm at a loss. Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted August 2, 2015 Report Share Posted August 2, 2015 How many miles on your Edge? Is the noise continuous or intermittent when coasting? Is it only when you start up it up and drive away after letting it sit for some time? AWD immediately begs the question: PTU. So check the PTU fluid condition, see if there are any signs of leaks on the unit or the driveway. With your foot on the brake, work slowly through the gears and listen carefully to see if you can hear it while the Edge is not moving. Did you install the brakes yourself (rotors AND pads, or just pads or ...)? Are the caliper slide pins and pistons moving freely? Is the transmission that was installed new/recertified/used? Check all nuts & bolts on the parts replaced to make sure everything is mounted properly & securely. May have to use loctite to secure those that have come loose. Quote Link to comment Share on other sites More sharing options...
macbwt Posted August 2, 2015 Report Share Posted August 2, 2015 I would start by jacking it up and giving everything a go over then spinning the wheel etc. Sometimes drive train noise can transmit them selves from on location to another so this also makes diagnosis a difficult situation. Being AWD PTU is always suspect. It could also be bearings on the drive line to the rear. This drive line is either a two or three piece so you may want to check that out also. Grinding as a note will generally be more pronounced from brakes that have been sitting even from an overnight rest. Not sure how many miles you have the NEW bearings, but I have had a bearing fail with just 20k miles on it. Brakes is stuck can wear quickly down to metal and grind also, usually a front or rear catch will cause one end to stick and wear down to metal so check the pads. You should be able to do this inspection with flash light and removing the tires and some real close viewing. Quote Link to comment Share on other sites More sharing options...
Dave7778 Posted August 3, 2015 Author Report Share Posted August 3, 2015 Replaced both front bearings about 8k ago and the passenger rear on July 30th, brakes are about 500mi old, yes I did them myself and I put high temp grease on the guide studs. Also did the bearings myself. I read on one of these threads that although the PTU claims zero maintenance that the oil often breaks down at high mileage and leads to PTU failure. It doesn't leak anywhere but I'd like to drain and refill it, but I'm not sure how or what kind of oil it uses. Quote Link to comment Share on other sites More sharing options...
Dave7778 Posted August 3, 2015 Author Report Share Posted August 3, 2015 Oh, and usually squeaky brakes goes away when u apply brake pressure but this sound is completely unaffected by applying brakes. The only thing that stops it is acceleration. Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted August 3, 2015 Report Share Posted August 3, 2015 (edited) Definitely check out the PTU fluid then. It uses 75w140 gear lube (specs in owner's manual). More useful info regarding the PTU in this thread: http://www.fordedgeforum.com/topic/10914-ptu-leak-failures/ Edited August 3, 2015 by WWWPerfA_ZN0W Quote Link to comment Share on other sites More sharing options...
Dave7778 Posted August 3, 2015 Author Report Share Posted August 3, 2015 Wow that was a very helpful write up on that link. I tried to hand pump out the old oil but can't get the suction hose past the gear into the bottom. The little bit I got out was still runny by definitely saturated with metal filings so I hope it's salvageable. I think that adding the drain plug on the bottom is the way to go. Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted August 3, 2015 Report Share Posted August 3, 2015 Do drain & fills at short intervals initially. As it thins out with each fill, should be easier to pump out more. Measure how much you are putting back in each time, if you can get the stated capacity out, that'd be perfect! You do have to use a flexible hose to get to the bottom. Like these kits: http://amzn.com/B000CMDPBM http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_x_22973737-P_x_x http://www.amazon.com/dp/B006AZKBO4 Quote Link to comment Share on other sites More sharing options...
macbwt Posted August 3, 2015 Report Share Posted August 3, 2015 Hope for the best but plan for the worst. Metal in oil is never a good sign of a healthy gear system. Quote Link to comment Share on other sites More sharing options...
Dave7778 Posted August 8, 2015 Author Report Share Posted August 8, 2015 Just had the live oil changed. Not much came out, but what did come out was shiny with metal. Still making the same noise. How many bearings are inside the PTU and are they hard to replace? Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted August 8, 2015 Report Share Posted August 8, 2015 There's a real risk that the PTU is done for You could try having it changed once more, hopefully with better results. No idea on how many bearings there are, though I faintly recall the_natrix investigating and listing some part numbers ... Quote Link to comment Share on other sites More sharing options...
Dave7778 Posted August 11, 2015 Author Report Share Posted August 11, 2015 UPDATE: FIXED. Inner race on the front wheel bearing broke loose and allowed debris inside. Replaced and noise is gone. I now have 138k miles on my PTU and all is well. I installed the PTU drain plug (what a bitch) and replaced oil 3 times. Runs like a champ now!! 2 Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted August 11, 2015 Report Share Posted August 11, 2015 Rather a wheel bearing than a PTU!!! Enjoy the fruits of your labor Quote Link to comment Share on other sites More sharing options...
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