Replacement of rear sub frame bushes

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ilovemy2.8z3
Joined: Wed 26 Oct, 2016 12:54
Posts: 3

  Z3 coupe 2.8

Replacement of rear sub frame bushes

Post by ilovemy2.8z3 »

It's that clunk again
1997 2.8 Roadstar recently passed its MOT with flying colours except for an advisory on the rear sub frame bushes. Everything else checks out on the rear clunk so going to have the bushes replaced - certainly some movement on O/S sub frame.

Anyone got any hints or advice on how to tackle the job, and others things which it is sensible to replace while its being done.

Also interested to hear of any garages/technicians within 25 miles radius of Congleton who have done a good job - and at what charge ??

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Deano1712
Z Register organiser
Joined: Sat 05 Aug, 2006 12:56
Posts: 1395

  M roadster S50
Location: Leeds

Re: Replacement of rear sub frame bushes

Post by Deano1712 »

Subframe needs to be removed, or at least dropped to ground. This involves taking off exhausts and handbrake cables, disconnecting driveshaft. The pesky brackets that attach to sills can be difficult to get off due to M8 caphead screws being corroded - worth checking those as pre-task. The old bushes are difficult to remove and really need a special tool or pressing out. Some have resorted to burning them out! I recommend upgrading the bushes to poly. While doing the job its worth refreshing fuel tank straps and the trailing arm bushes.
Z3M with a few mods...and a little bit more power

ilovemy2.8z3
Joined: Wed 26 Oct, 2016 12:54
Posts: 3

  Z3 coupe 2.8

Re: Replacement of rear sub frame bushes

Post by ilovemy2.8z3 »

Thanks - a useful resume of the challenges. Certainly a garage job but doesn't sound too bad if you have the gear for bush removal. I guess un-seen corrosion is the 'elephant in the room' - will give everything a good dose of WD-40 before they start.

Mazza
Joined: Thu 21 May, 2020 17:42
Posts: 2

  Z3 roadster 1.9

Re: Replacement of rear sub frame bushes

Post by Mazza »

I stripped mine down at the beginning of this year and replaced all the rubber bushes, springs, shocks, brakes etc. Having access to a press is really useful. I had the old beam bushes and the diff bush pushed out and new ones pushed in, as I used OEM rubber ones. If you go for the poly. version ones they are much easier to put in by hand.
Also, the 4 hex recessed bolts that hold the beam plates in are no longer available so a lot of release fluid and ensure that they are cleaned out and the hex driver is well inserted ( a tap with a hammer is recommended, before trying to undo them)

I removed the rear beam axles and diff in my garage with the car on axle stands. Not difficult just a bit awkward due to the weight of the component parts.

ilovemy2.8z3
Joined: Wed 26 Oct, 2016 12:54
Posts: 3

  Z3 coupe 2.8

Re: Replacement of rear sub frame bushes

Post by ilovemy2.8z3 »

Thanks. Comments appreciated. Still something I am going to entrust to a skilled mechanic even if it costs me a penny or two !

Mike Fishwick
Joined: Fri 19 Jun, 2009 10:27
Posts: 2054

  Z3 roadster 2.8
Location: Daglan, France

Re: Replacement of rear sub frame bushes

Post by Mike Fishwick »

You could try making some pieces of 100 mm sewer pipe to fit intothe spaces on each side of the bush - this can make a surprising difference. Also make sure that the crossmember is not touching the body or the stiffening backet.
A Z3 is not just for Christmas - it's for life!

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