Knock coming from somewhere RB320

[FlyingBadger]

Hi all

I have an RB320 that has started knocking, it seems to coming from the front right (O/S) when turning right at slow speed.

I have had it up on the ramp this afternoon and checked all bushes etc. for play.

The only one that has play is the centre prop shaft bearing/rubber carrier, I can push the prop shaft up and it hits the floor, is this excessive play on these or is it supposed to have that much movement?

Thanks in advance.

FB

 

[kershaw-330s]

 

I wouldn't think they should have that much play that it would hit the car , I'm no expert but to me that sounds too much

 

 

 

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[Piggysniffer]

9 hours ago, kershaw-330s said:

 

 

I wouldn't think they should have that much play that it would hit the car , I'm no expert but to me that sounds too much

 

 

 

 

 

 

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Agreed, a prop shaft surely should not be able  hit the floor ???

[FlyingBadger]

Right

Got a new centre bearing/carrier fitted, re-installed the prop and that seems to have solved the constant knock.

There is still a knock coming from O/S front.

From 1-10 MPH there is a constant knock, knock, knock, wheels straight and turning to the right, doesn't seem to be there when turning left and it seems to disappear when going a little faster, say 20 MPH.

I have checked bushes etc. again and the ARB drop links seem to move around a lot, the rears are tight.  I have been reading that the driveshaft CV joints go and this is the same sort of knocking noise.  I have tried to move the driveshaft's in search of play and they seem to be fine, (tested on a ramp with wheels hanging down).

Anyone got any views on this?

Thanks

FB

[stuartie]

You probs won't get alot of movement on the cv joints as it only takes a slight bit of wear for them to start knocking and most of the time its not till you get them stripped down that you'll see the movement in them 😉

[FlyingBadger]

1 minute ago, stuartie said:

You probs won't get alot of movement on the cv joints as it only takes a slight bit of wear for them to start knocking and most of the time its not till you get them stripped down that you'll see the movement in them 😉

Thanks for your reply Stuartie

I shall get on with removing the O/S drive shaft and report back my findings.

FB 

[savage bulldogs]

Outer c.v's do tend to make a "clicking" with rotation of the wheel on full lock when worn .

You might not have heard it with the wheels hanging down , due to there being a lot less stress on them (cars weight) and the difference in the angle of the wishbones .

Try doing a slow circle with someone outside the car to see if they can hear it . Make sure it's nothing simple like droplinks or a mud flap catching a tyre .

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[FlyingBadger]

On 12/09/2017 at 6:49 PM, savage bulldogs said:

Outer c.v's do tend to make a "clicking" with rotation of the wheel on full lock when worn .

You might not have heard it with the wheels hanging down , due to there being a lot less stress on them (cars weight) and the difference in the angle of the wishbones .

Try doing a slow circle with someone outside the car to see if they can hear it . Make sure it's nothing simple like droplinks or a mud flap catching a tyre .

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Thanks Savage Bulldogs

The O/S mudflap was touching the tyre on full lock, I have removed this for the time being and retested - Still getting a knock when wheel straight and when turned to the right.

I have had someone outside the car while turning and its certainly coming from the front O/S wheel area.

The rear ARB bushes and drop link bushes are shot - the ARB moves left and right within the D bushes and the drop links move about.

The front ARB D bushes are still tight but there is some movement from the drop links but not sure if this is "excessive play" or they are just moving as being poked with a pry bar!!  Should there be any movement in the drop links at all?

Thanks

FB

[mattiekane]

I'd lean towards CV joint

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[savage bulldogs]

Difficult to say how much play is too much on the front droplinks tbh . But the rear arb shouldn't move in the u clamps , id get that sorted fairly sharpish bud . Just make sure you check the size of your rear arb before ordering new d bushes .

Does it do it over bumps or just randomly in a straight line ?

If its a knock rather than clicking top mounts and bottom balljoint could be worth checking too


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[FlyingBadger]

Hi all

It is more of a knocking noise, but as the wheels go round it seems to knock, knock, knock, if you get my meaning?

It seems to be more noticeable over bumps but does it when moving in a straight line and turning to the right.

I will check the top mounts today, bottom ball joints checked and nothing untoward there.

Thanks

FB

[FlyingBadger]

Right

Top mounts checked, they seem fine, no excessive movement etc.

So it seems everything is pointing to the drive shaft/s, going to get on with removing O/S first and check that for wear and damage.

One thing I have noted about the rear ARB is that it is really rusty, the powder coat has come off and I am not sure if the diameter has shrunk due to the rust so I am going to replace the bushes first and hopefully the ARB wont need replacing, I am also going to replace front ARB bushes and drop links just for peace of mind as there is movement from the drop links but unsure if it excessive.

I will report back once I have removed the drive shaft.

Thanks all

FB