Vibration through steering column on slow turns - but not always....

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carnutoxon
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So, this is an original style 2017 model G350d with 19" wheels and 275/55 Pirelli Scorpion tyres. Sometimes when parking or doing a 90 degree turn, I can feel a string vibration through the steering column and I can also hear it. It's pretty loud. Mostly RH turns but not always. MB dealer has had the column out and replaced a sleeve? Or bush where the column goes through the body shell.  No change. Might even be worse.  Dealer is stumped so I'm trying the experts!  Any thoughts? Might it be to do with the front diff even? 
The other steering issues I have are a) that on full LH lock it feels like the steering linkage is catching on something so you have to jiggle it a bit to free it up and b) the steering doesn't stay aligned - I now have to turn it 5 degrees to the left to travel straight.   Any thoughts on these questions please?

 

Jdring
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Re: Vibration through steering column on slow turns - but ...

Hopefully you will get better responses than me, but here's some input.

1. I never put steering on full lock either side - its just not good. (buggers the relief valve or something)

2. I have an older G350D (2012) and the steering is a little heavy but good and centred.  If you have to hold the steering wheel to stop the drift, then it suggests tracking.

3. if you have a worn drag link ball-joint, it can 'jump' when at the extremities of movement...needs replacing.  But a main dealer will have seen that right away (I would think).

Turning circle in the 463 doesn't seem to me to be as good as in my 460 (but thats comparing a LWB with SWB).  Maybe there should be a restriction on yours?  I'll have a look.

Theo
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Re: Vibration through steering column on slow turns - but ...

I would focus on your point b):  "the steering doesn't stay aligned - I now have to turn it 5 degrees to the left to travel straight." That sounds to me like a serious tracking issue, i.e. misaligned wheels. Any tyre shop can check that.

 

 

bigblock
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Re: Vibration through steering column on slow turns - but ...

Have you got the original factory wheels fitted. Sometimes with aftermarket wheels the offset is incorrect  which will cause the wider tyres to rub on the chassis leg when on full lock.

It could also be that you front diff is locked or has not disengaged properly although that should be obvious from the front diff light showing red on the switch. Have you used the difflocks recently? You would have to have locked the centre and rear diff before you could lock the front diff as they only work in sequence although when you disengage the centre diff they should all disengage automaticaly. If they are not used regularly the activation pistons are prone to seizing. If the front diff is engaged and you make sharp turns on tarmac you will feel a severe judder through the steering and will hear a metalic banging or clanking noise. The steering will also feel vague and the vehicle will track left and right when accelerating.

Regarding the steering wheel alignment I would say if you didn't have this issue before the steering column was removed and replaced by the dealer then they have probably misalligned it when they replaced it. Most likely cause is that they have not put the steering wheel on straight !

 

carnutoxon
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Re: Vibration through steering column on slow turns - but ...

Thanks to all for the thoughts and suggestions.  I really appreciate you taking the time.  I'm going to follow up on these points, and the dealer has also just identified that I have split gaiters which has allowed dirt ingress to the ball joints, and so a degree of grinding.  Parts are on order. Tracking and alignment will be looked at too.  So let's see where this leads.  To pick up on a few points, the wheels are standard (but I've been thinking about switching to a smaller rim diameter, maybe 16", and possibly going to steel, while keeping the overall diameter around 31") and I agree about the turning circle - supertanker territory - which adds to the grin factor but does mean you reach for full lock when on other cars, you wouldn't.  I'm not showing any diff lights but will use the locks and check they are engaging/disengaging.  

 


 

 

G-Restorations
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Re: Vibration through steering column on slow turns - but ...

 

Check your tyres for deformation,  we've had several Pirelli shod 4x4s with wonky tyres,  Pirelli's seem to be very prone to carcase damage.

cheers, Gordon

JASONGDS
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Re: Vibration through steering column on slow turns - but ...

Did your dealer replace the steering column?  

Easy one to try, give the column UJs a real soaking in WD40 etc, drive around on lock to lock a few times,  repeat. 

Mine seized once I left the car for a few months