Differential Noise
#23
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Mine's got slight whining when off throttle. Mainly wehen coasting around 60-80 km/h. I ordered the bearings already, still the seals to go. I'll head to Al Tayer (local dealer) tomorrow to buy/order as many companies abroad don't send to P.O. Box.
QUOTE=myexcursion;1703021]What symptoms does a bad differential exhibit?
QUOTE=myexcursion;1703021]What symptoms does a bad differential exhibit?
#24
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Btw can someone contact PiersXK as I quess I can't send private messages yet. I just want to know the garage he used building his diff in Dubai! 👍🏾
Mine's got slight whining when off throttle. Mainly wehen coasting around 60-80 km/h. I ordered the bearings already, still the seals to go. I'll head to Al Tayer (local dealer) tomorrow to buy/order as many companies abroad don't send to P.O. Box.
QUOTE=myexcursion;1703021]What symptoms does a bad differential exhibit?
QUOTE=myexcursion;1703021]What symptoms does a bad differential exhibit?
#25
#26
#29
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It's almost always a gear mesh problem. As they wear they'll make noise. If the bearings go or the lash changes from gear face wear they'll make noise. Not much you can do about it except replace the gearset and hope your shop does a decent job with setting them up. Not difficult to mess up.
#30
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I can hear a whirring sound, sort of like an old aeroplane propellor, most noticeable around 60-70mph. Seems to be coming from the rear end. Had the car in for service yesterday, they didn't have time to properly diagnose it but said they checked the wheel bearings and they seem to be fine. They didn't do a road test, however so not sure how certain they can be. They want the car back to do proper diagnosis.
So could the sound I describe be a symptom of a failing diff? Anythig I can do to rule that or anything else out (the "freewheel test" maybe - I guess pop the car in N while it's exhibiting the noise)?
So could the sound I describe be a symptom of a failing diff? Anythig I can do to rule that or anything else out (the "freewheel test" maybe - I guess pop the car in N while it's exhibiting the noise)?
#31
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Put it up on a 2 post hoist so the wheels are off the ground, have someone in the driver's seat run the car in gear to the speed you normally hear the noise (DSC turned off of course).
Get underneath and listen for where the noise is coming from. Not exactly A+ health and safety practise but that's how the bad diff in my XJR was confirmed...
Get underneath and listen for where the noise is coming from. Not exactly A+ health and safety practise but that's how the bad diff in my XJR was confirmed...
#32
#33
#34
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Look for metal filings , also any play in the diff pinion when rotating the drive shaft
Off the top of my head I don't recall seeing a drain plug, if there is a plug obviously remove and drain otherwise you'll need to suck it out the filler plug which you'll need a 3/8 ratchet to remove .
Off the top of my head I don't recall seeing a drain plug, if there is a plug obviously remove and drain otherwise you'll need to suck it out the filler plug which you'll need a 3/8 ratchet to remove .
Last edited by steve_k_xk; 04-05-2018 at 04:40 AM.
#35
#36
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Fair enough, I'm not the most mechanically minded but it's not going to hurt to change the fluid, as far as I know it's not been done and the car is showing almost 93k miles. I'll have a good look first, see if there's any signs of issue with the diff or the CV joints etc.
#37
#38
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The key with a diff is the setup. Installing new bearings alone won't do. The pinion depth, bearing preloads and backlash all must be re-measured and adjusted as necessary afterwards. Get it wrong and it will make noise. I found my diff to be on the very outer edge of spec when I did my Quaife. Installing the new bearings/races helped tighten the specs but we still changed the shims a few thousandths. This improved the backlash and the on/off slop was all but gone.
Here's the thread:
https://www.jaguarforums.com/forum/x...lation-155867/
Here's the thread:
https://www.jaguarforums.com/forum/x...lation-155867/
#39
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Hi
I have an 2007 XK8 Convertible here in Dubai and I requested Jaguar to check out a running sound from the rear of the car. I thought it was a wheel bearing. Their free-wheel test identified the differential as being the source of the sound and their notes stated, "Need to follow JTB00175v6. Estimate rear differential assembly".
The car has only done 98000km (61000m).
Does anyone know what this message means.
More importantly what does this noise indicate? Lack of oil or a more important problem??
I will try and ask Jaguar but it is not easy contacting the service team without going in.
Thanks
I have an 2007 XK8 Convertible here in Dubai and I requested Jaguar to check out a running sound from the rear of the car. I thought it was a wheel bearing. Their free-wheel test identified the differential as being the source of the sound and their notes stated, "Need to follow JTB00175v6. Estimate rear differential assembly".
The car has only done 98000km (61000m).
Does anyone know what this message means.
More importantly what does this noise indicate? Lack of oil or a more important problem??
I will try and ask Jaguar but it is not easy contacting the service team without going in.
Thanks
#40
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Just a thought. Sometimes we forget the basics... Not sure on the 2007, however, early x100's have zerk ( grease) fittings on the rear axle universal joints. Rare is it people, service stations grease anything these days. Helped my 99 XK8. I also removed the rear behind axle mufflers for a wee bit of extra muscle sounding. I installed dynamat insulation in trunk area to remove the inherit drone from the exhaust. All well. Rich