924Board.org

[Portporschedon]

had the identical problem.
Front wheel re-balance improved it, but not by much.
Full alignment check and another wheel re-balance by a Porsche dealer solved the issue.

Happy motoring

Don
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White 1983 924 - Renovated to near original condition and my daily driver

Dolomite 1986 924S - Coming to the end of a 4 year refurbishment.


Life is not a rehearsal

[bureau13]

Sorry, I wasn't clear...I feel it in the steering wheel. I don't know that wheels are actually doing anything, but my steering wheel shakes.

[bureau13]

Rear control arm bushings caused a vibration in the steering wheel?

To be honest, I'm sure mine are, let's just say not new Probably should be changed regardless...

[peterld]

Does your steering wheel move, or rather the steering column, when the car is at standstill? If so, it's the plastic bush at the top of the column.
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80/81 932/8 ROW

[kondzi]

[bureau13]

The steering wheel shakes at speed. Actually, over a range of speeds, and when heavy braking, but say I speed up to 65, I will feel it, if I go faster it will get worse but sometimes I can get it into a sweet spot where it is hardly doing it at all.

I don't really feel anything obvious when I try to move the column at a standstill.

I had assumed that I was feeling vibration up through the wheels/tires/steering linkage, but all the obvious items there were dealt with, and it didn't improve.
_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)

[kondzi]

Try to see if front wheels wobble. You can stick out your arm with phone in hand over the window and try to record it.

When doing this 65mph and your driving wheel shakes, press clutch pedal. Sometimes vibration from the drive shaft transfers to the rest of the car, but I doubt it.

When dealing with bent brake rotors with light braking it should shake, with hard shaking this should stop. If in your case as you state hard braking equals driving wheel shake / wheel wobble I think it's related to the front suspension.

How old are your tires?

Do you drive the car all the time or it was sitting not driven for a longer period? (tires could get deformed, flatten where touching ground - balancing will not help in that case)

Did you do a proper wheel alignment? Front and rear?
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Konrad
'89 951 US
'88 Mustang 5.0 LX Convertible (factory specs)
'84 911 Carrera 3.2 RoW (factory specs)
'81 931 RoW (TBD)
'81 Ford Capri 2.8i (factory specs)
'79 Ford Capri 2.9 (heavily modded)

[Portporschedon]

[quote="bureau13"]Sorry, I wasn't clear...I feel it in the steering wheel. I don't know that wheels are actually doing anything, but my steering wheel shakes.


I understood your problem.
My problem was identical to everything you describe.
It took a wheel alignment check and a wheel balance to correct the problem.
Apparently Porsche will only do a 4 wheel alignment check (in the UK anyway), however any competent garage will be able to do a front wheel alignment and wheel balance.

My problem was sorted, yours may be caused by other issues, however a front wheel alignment & balance would be my first thing to check before I started pulling steering columns etc.
As has been mentioned, if the steering wheel can be moved side to side, its probably a bush or bearing in the column.

Good luck with the problem.
Regards
Don
_________________
White 1983 924 - Renovated to near original condition and my daily driver

Dolomite 1986 924S - Coming to the end of a 4 year refurbishment.


Life is not a rehearsal

[!tom]

Bent wheel
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78 924 NA
5-lug

[Fasteddie313]

[bureau13]

That makes a lot more sense! I'll check them out. I would definitely prefer that to something in the steering linkage...

[Fasteddie313]

Mine looked and felt ok but replacing fixed the problem..
Was an easy job replacing with poly ones, sliced the old ones with a cutoff wheel and new slipped right on..
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80 Turbo - Slightly Modified

[bureau13]

I put this issue on the back burner due to other priorities, but I removed my seized AC compressor today (finally!) and the steering shaft is right there. If I grab the shaft and shake it, there's not a lot of play, but enough to make this sound (see linked video). Is this normal? I'm guessing it's not, and could be the issue I'm feeling.

https://photos.app.goo.gl/cavL5oB9Vs675Xej9
_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)

[james911996]

I had the same issue with a 944 Turbo a few years ago.
Wheels balanced, new tyres, new discs, etc. Lots of money spent with an independent transaxle specialist. To no avail.

Eventually went to a wheel shop. They took the two from wheels out and did 2 things:
- sanded them down where the wheel makes contact with the hub - they said there was some old paint not completely flat
- rebalanced the wheels (properly this time I guess)

And in 15mn it was all fixed.

So maybe try and find someone with modern wheel balancing equipment and try again.

Best of luck
James

[bureau13]

So no one knows if this "knocking" is normal? I guess unless the compressor is out of the way you don't really have access to it from the top.