924Board.org

[Johann]

I have just ordered new Control Arms for the 931 and they arrived yesterday fully assembled with new bushes and balljoint already in place. They look great and for the price of €44 it is a right bargain compared to buying the bushes and balljoints and rebuilding the control arm yourself.

What I am unsure about the the castor bushing. According to PET I should have 477.407.181 A

On my new control arms I have a bushing that looks like this:


However on many Porsche webshops I see a part with metal inside it like this one


Who can tell me which is the correct version?

[Dutch924-racer]

these ar fine, I had them from Powerflex an they also did not have the metal insert, but never had any problems with it.

The ones with the metal insert can be a pain to get off when they are old/ rusted
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937 trackday car
Series 2 engine
951S turbo and intercooler
Fast road camshaft
Forge recirculation valve + boost controller

[ideola]

[Johann]

Thanks guys,

I just ordered the uprated part. I was considering PowerFlex, but I am not a fan op polyurethane bushes. They are ok on sway bars but they are too noisy for my liking.

I'll be sure to update you guys on the progress with my suspension ugrade

[Glemon]

poly bushings need a liberal application of silicone grease or they will squeak and also wear faster. I have found I have to reapply every two years or so, or they start getting noisyour again. https://www.amazon.com/gp/aw/d/B000DZFUPC/ref=mp_s_a_1_1?ie=UTF8&qid=1483710142&sr=8-1&pi=AC_SX236_SY340_FMwebp_QL65&keywords=silicone+grease&dpPl=1&dpID=517tAb1ugnL&ref=plSrch one example of the product. The rubber parts are lower maintenance for this reason, but you can avoid the noise with the grease.
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88 924S
68 TR250
02 IS300

[ideola]

[Johann]

The new castor bushes arrived today. They are quite a bit more chunky than the older style bushes.





While both have metal inserts they clearly have a different design parameters. Since I am now going to have metal on metal what is the best advice for lubrication?

My first choice is ceramic grease, but would love to hear your advice.

[Rasta Monsta]

That is a press fit. The metal sleeve isn't designed to turn on the arm, suspension movement is from deflection of the bushing. Ergo, on installing, it must be clocked to correspond to the position of the control arm relative to the body while loaded.

In other words, when the car is sitting on the ground, the bushing shouldn't have any twist.

Same situation with the front bushing... the mounting bolt isn't tightened until the suspension is loaded.
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Toofah King Bad

• WeiBe (1987 924S 2.5t) - 931 S3

[Johann]

Ah, that makes sense. Thank you Rasta!