Power when on lock

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Jdring
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So I have driven a few G's now and quite a few exhibit the symptom of 'groaning' when applying power when you have some steering lock on.

What is that?  Is it simply the drive chain working against the rear differential?

prwales
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Re: Power when on lock

If you have a lot of steering lock its most likely the power steering

Nick123
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Re: Power when on lock
Being a cissy I try to avoid full lock on any vehicle at any time. You might look at your power steering fluid. I replaced mine last year. It was a horrid muddy gloop when it should have been a very pleasant shade of liquid red. Good luck.
JASONGDS
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Re: Power when on lock

There is also a little oil filter in the power steering reservoir,  two types of pas fluid, some is green , others red. MB should be able to advise the correct fluid with chassis no. Using full lock at slow speeds,  off road etc can  cause it to groan , or stall,  modern stuff the ECU increases the idle speed to compensate for the extra effort

Jdring
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Re: Power when on lock
No, this is not the groan I mean. Never go to full lock on power steering. I mean pulling out of a t-junction for example with half lock and some power. You get a background straining/groaning. UJs maybe? Rear Diff? You get it on most 460s when 4x4 selected and the car feels heavier.
JASONGDS
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Re: Power when on lock

Should not be using 4x4 on a hard road on a 460, really bad for it possible front c joint?  Or have had issues with steering column uj s getting stiff, if car been stood, give them a massive dose of WD40, etc

Pistonhead
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Re: Power when on lock

Yes you are correct, it is the rear crown wheel, not only turning the drive shafts but upon a turn it has to turn a mass of the differential hub and the gears churning in close ratio. Generally speaking even traveliing in a straight ahead position most rear diff's, I have noted are a touch more noiseier than they ought to be. Thank God it not a Ford Transit! they are worse for diff noise.

Best looked after is the regular bi-anniual oil change or is it every four years? I not sure at the moment. And ensuring the rear brake shoes are correctly adjusted. I know it sounds stupid but it is a stupid design flaw, the rear brake adjuster engauges applying the hand brake lever moving in reverse to keep the automatic adjuster within tolerence. I have read the manual three times and I am convinenced that is what I read. I need to read it again, I suppose.

One could try adding an oil noise reducer, I think it is a Wynn's product. It is a polymer additive designed to reduce friction and dampen noise.

Cure: Turn the radio on louder. laugh

Jdring
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Re: Power when on lock

Makes sense.  I reckon rear (and front) diff noise/loading.  I will be sure to keep the oil in mine renewed and topped up.  My old 460 probably hasn't had any for years.