Hydraulic Thrust arm bushing- Bentley 310-9???

[Gene in NC]

What's with "hydraulic" thrust arm bushings? New news to me. 12/88 production date car bushings replaced with 750s at about 60k . Thought that was the hot set up.

[BigKriss]

What's with "hydraulic" thrust arm bushings? New news to me. 12/88 production date car bushings replaced with 750s at about 60k . Thought that was the hot set up.

Do you have a link for the hydraulic thrust arm bushings? 750i bushings are the normal upgrade around here, you can press in M5 bushings or even polyurethane ones.

[BigKriss]

after reading your post a second time - u mentioned p310-9 of the bently manual which describes the thrust arm install and remove. maybe somone else can shed some light what is meant by hydraulic bushes

[Mobius]

after reading your post a second time - u mentioned p310-9 of the bently manual which describes the thrust arm install and remove. maybe somone else can shed some light what is meant by hydraulic bushesHydraulic bushings are not solid rubber; they're fluid filled and therefore have superior shock-dampening characteristics. 750 bushings are hydraulic, as I believe stock E34 thrust arm bushings are. Nothing terribly special.

[BigKriss]

Hydraulic bushings are not solid rubber; they're fluid filled and therefore have superior shock-dampening characteristics. 750 bushings are hydraulic, as I believe stock E34 thrust arm bushings are. Nothing terribly special.

Thanks Mobius, you learn something new everyday

[Anthony (M5 in Calgary)]

The M5 bushings are all rubber and likely the stiffest of the lot short of urethane. Probably the most durable too.

Anthony