machining 750 bushes for e28

[rob101]

hello everyone,

just wondering if anyone knows the site that has the dimensions that you have to machine the 750iL bushes to fit the e28 thrust arms. think i might give it a go, for shits and giggles.

[rob101]

bump damn

[Anthony (M5 in Calgary)]

bump damn

Try www.mye28.com

[genphreak]

Try www.mye28.com

Heating them up might do it...?

[rob101]

Heating them up might do it...?

lol the diameter difference is in the vicinity of 5 mm i read so yeah have to machine but thats okay, i just remember seeing a site somewhere with the procedure etc. i just can't find it .

[genphreak]

lol the diameter difference is in the vicinity of 5 mm i read so yeah have to machine but thats okay, i just remember seeing a site somewhere with the procedure etc. i just can't find it .

I thought that e34 ones fit straight on/were the same, maybe some are different, I don't know. I'll measure the old ones I have tommorrow and advise the diameter for you then. Nick

[bfd]

I thought that e34 ones fit straight on/were the same, maybe some are different, I don't know. I'll measure the old ones I have tommorrow and advise the diameter for you then. Nick

No, E28 control arms are smaller than E34 and thus the 750i bushings do not fit. There are basically 3 vendors who sell a milled 750i bushing to fit the E28 control arm: Bav Auto ($60 each), Dinan ($50 each) and www.ultimategarage.com ($35 each).

As to milling your own, from the BMW database:

Date: Tue, 28 Mar 2000
From: "Steve D'Gerolamo" <steved3@idt.net>
Subject: [uuc] 750 Thrust Arm Bushings

You don't need to spend a lot of money on these for your E28 or E24 car.
Pick up a pair of fluid filled 750i bushings (the green ones made by Boge)
and take the center down equally on both sides so it fits perfectly in your
subframe. I use a 20hp Leadwell lathe but you can use a few hand tools
around the shop. Now machine a few mm off the steel casing equally on both sides so this will not contact the subframe with side deflection of the
arm.

If your thrust arms are in very good shape except for the bushing, you can
simply replace the bushings...on the car with an OTC7249 or you can
carefully remove the old arms with the proper ball joint press (you dont
want to damage the ball joint side) and 5-10 tons with your shop press and
proper sized arbor.

I personally would rather replace the thrust arms with new Lemforder/oe
components at this time. This way you can use a bit more force and a
separator fork to muscle the old ones out. Pick up a new set of arms from
your favorite parts supplier and press in your newly machined bushings. Be
careful using a shop vice and big socket in lieu of a press and
arbor....you may break the handle off the vice or puncture the bushing
(remember, these are fluid filled) with a poor fitting socket. SD (PS-
these bushings work great in E32/E34 cars without the machining)

[rob101]

there is the other option of those grunt bushes aren't they made by a mob in australia? noltec?

[Anthony (M5 in Calgary)]

[QUOTE=bfd]You don't need to spend a lot of money on these for your E28 or E24 car.
Pick up a pair of fluid filled 750i bushings (the green ones made by Boge)
and take the center down equally on both sides so it fits perfectly in your
subframe. I use a 20hp Leadwell lathe but you can use a few hand tools
around the shop. Now machine a few mm off the steel casing equally on both sides so this will not contact the subframe with side deflection of the
arm.

QUOTE]

Ah, I see. The OD of the bush is correct for the ID of the thrust arm but the bushing itself is too wide to fit in the subframe...

[Bill R.]

narrow it up enough to fit... a mill is more elegant.. most people dont use a lathe on it.. but anything to remove material from the sides will work.. however crude it is.



[quote=Anthony (M5 in Calgary)]

You don't need to spend a lot of money on these for your E28 or E24 car.
Pick up a pair of fluid filled 750i bushings (the green ones made by Boge)
and take the center down equally on both sides so it fits perfectly in your
subframe. I use a 20hp Leadwell lathe but you can use a few hand tools
around the shop. Now machine a few mm off the steel casing equally on both sides so this will not contact the subframe with side deflection of the
arm.

QUOTE]

Ah, I see. The OD of the bush is correct for the ID of the thrust arm but the bushing itself is too wide to fit in the subframe...