Clunking Noise from rear Diff area

Yamiuchi · Post by **Yamiuchi** » Fri Nov 04, 2011 9:21 am

Thanks for update Stromtech

v7jco · Post by **v7jco** » Fri Nov 04, 2011 2:15 pm

Check this thread
http://www.z4-forum.com/forum/viewtopic ... &view=next

I just had mine fixed and I've written it up

V7

Stromtech · Post by **Stromtech** » Fri Jan 06, 2012 1:02 am

Had mine fixed today..I also posted my fix on another thread on this forum....
http://www.z4-forum.com/forum/viewtopic ... ng#p424085

I thought I'd also share the fix here so the thread is updated properly for the next guy searching for answers.

My propeller shaft had some slop which the indy fixed by taking the 2 sections apart, putting in an o-ring and slathering silicon all over the splines before reassembling the 2 sections. He also checked the differential flange as per the SIB and added some loctite to the splines.

Result= Totally Quiet Drivetrain.

He removed the CDV and applied lithium grease to the shift rod ball above the propeller shaft while it was on the hoist.

Just like New again for 2 1/2 hours labour charge...

I am one happy camper...Kudos to R&W Motorsport in Victoria BC

thedumpster · Post by **thedumpster** » Sat Feb 18, 2012 12:52 am

Just to add my experience of this, I had a brand spanking new 5 series delivered on March 1st 2008, within a couple of months it started making a strange metallic 'click' noise when put in reverse and moving off. I mentioned it when it went for its first service and BMW told me the diff needed lubricating which they did and it didnt make any noise after that. I now have 2004 Z4 that has started doing the same thing so I'm pretty confident I know what it is... must be a bmw thing!!

raphael81 · Post by **raphael81** » Mon Dec 23, 2013 10:02 pm

Hello everyone. I,am French and I have some difficulties to understand the technical words used on this thred. I have the same problem (rear differential noise) with my z4 3.0 E85. The < Check 18th bulletin labelled "Differential Input Flange mating surface with the input flange is insufficiently greased" > is not working on the shipkiller.com website. Is it possible to send me this document or an other similar website ? Moreover, someone could give me the BMW PUMA 4670944 ? Which parts should be lube to minimize rear axle noise ? Have you got some picture or video ? Tank you

fishy · Post by **fishy** » Fri Mar 20, 2015 2:17 pm

Hi,

I just posted my solution to the Differential clunk repair with pics. viewtopic.php?f=3&t=30050&p=1109757#p1109757

Enjoy

Questiopns welcome!

firefoxchris · Post by **firefoxchris** » Tue Aug 16, 2022 1:01 pm

Very old thread but still relevant. Had mine fixed today and thanks to everyone on this thread for their input. From reading all the posts my friend also found the official BMW bulletin for the fix, I took this to the garage, they did it and it is fixed! I'm so happy, the clunk was getting slightly louder and annoying over time and it got my worried.

Attached is the BMW bulletin including the parts and process needed. I think the lubricant required is no longer made but my garage had an equivalent type. Total cost was £265, mainly labour to strip it back to get to the differential - then it was just a small cost for the seal and lubricant.

Not a sound now

Hope it helps someone! Still loving my Z4 E86 Coupé, 174,000 miles now!!

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: Z4Clunk1_Page_2.jpg (69.63 KiB) Viewed 508 times

Secondtothird · Post by **Secondtothird** » Wed Aug 17, 2022 9:46 am

Much obliged.

Owen

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