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Old 15-07-2017, 02:59 AM
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Suspension squeak - urethane bushes?

I have all urethane bushings on the rear suspension of my 240 (1972) and it squeaks like mad at the back when there's big and slow movement such as going up/down a bit of kerbing. I'm not really aware of it on the road but at low speed a big bump like a sleeping policeman brings it out too. I'm pretty sure it's the bushings where the rear anti-roll bar is bolted to the body. It's loud enough to sound bad inside the car so it must make the old girl sound completely shagged to any pedestrian that hears it!
Question is, can this be cured with some sort of grease or should I just bin those two urethane bushes and fit rubber ones instead? I know they might not last as long but it isn't too difficult to fit new ones.
Is this one area where the rubber bushes still have the edge over urethane?
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Old 15-07-2017, 08:43 AM
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Were the urethane bushes greased when they went on?
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Old 15-07-2017, 10:39 PM
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I didn't put them on myself, but yes. I think there was a sachet of stuff supplied with them.
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Old 15-07-2017, 11:48 PM
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Can't find it now but remember reading an article which specifically said use the grease that comes with the bushes or suffer the squeaking!
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Old 16-07-2017, 02:29 AM
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you will get squeaking eventually either way
problem is the origenal rubber bushings are deigned to twist and deform to allow movement unlike the urethane ones that allow the rubber to pivot and slide in their housings which causes squeaking when urethane on steel rub causing the squeaking.
the grease helps prevent it but if it gets washed out (usually by jet washing) or not enough was applied on assembly then your going to get squeeking
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Old 16-07-2017, 09:55 AM
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What type of grease can be used?
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'72 240z RHD (4BOA) Painted and waiting assembly.
'72 240z LHD Silver "Rat look" daily runaround.
'76 280z ExLHD Red v8 Lexus powered restomod.
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Old 16-07-2017, 01:47 PM
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[QUOTE=Tony 260Z;276095
Is this one area where the rubber bushes still have the edge over urethane?[/QUOTE]


I think there's lots of area's where rubber bushes have the edge over urethan.
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Old 16-07-2017, 03:00 PM
racer racer is offline
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Quote:
Originally Posted by Tony 260Z View Post
I have all urethane bushings on the rear suspension of my 240 (1972) and it squeaks like mad at the back when there's big and slow movement such as going up/down a bit of kerbing. I'm not really aware of it on the road but at low speed a big bump like a sleeping policeman brings it out too. I'm pretty sure it's the bushings where the rear anti-roll bar is bolted to the body. It's loud enough to sound bad inside the car so it must make the old girl sound completely shagged to any pedestrian that hears it!
Question is, can this be cured with some sort of grease or should I just bin those two urethane bushes and fit rubber ones instead? I know they might not last as long but it isn't too difficult to fit new ones.
Is this one area where the rubber bushes still have the edge over urethane?
I've seen this before Tony. Probably badly designed bushes.
If they have a smooth bore they cant retain any grease on the crush tube surface.

If the bore has a pattern inside the grease will be retained.
Also the edge of the bush should not protrude beyond the crush tube, or it will bind up.

I learnt the hard way myself when I used the wrong bushes on my M3 a few years back.

Here's a video to explain better than I can.

https://www.youtube.com/watch?v=_z6OEohnPKw
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Old 18-07-2017, 01:43 AM
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Hmmm...thanks all. I'll prob start by undoing the bolts on the arb-to-body joint and lubing them like mad. We'll see what that does. I don't mind going back to rubber on those but it'd be a pain on the lower suspension arms... the damn pins will have to come out again
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Old 16-10-2017, 12:12 AM
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Well, all the ARB bushes are now the most heavily lubed ARB bushes in the world and the bloody thing still squeaks. Sooo.. lower control arms. Is there a way to get lube in there without dismantling? Which bit generates the squeak? Is it the inner crush tube squeaking against the poly or the metal ring of the lower arm with the poly moving inside that? It's driving me mad :-(
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Old 16-10-2017, 08:15 AM
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Reminds me of the Vw golf tv add many years ago. Turned out to be the drivers ear rings. Have you checked yours?
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Drives:

'73 240z 1JZ-GTE. Was pretty quick. 11.10@132.5mph
'72 240z RHD (4BOA) Painted and waiting assembly.
'72 240z LHD Silver "Rat look" daily runaround.
'76 280z ExLHD Red v8 Lexus powered restomod.
'74 260z LHD Restomod just started.
'71 240z LHD zg arched. Still in California.

Go to: www.240z.me.uk to checkout the cars.
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Old 16-10-2017, 11:13 AM
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Passengers, but well remembered! Forgotten about this ad completely .... !

https://www.youtube.com/watch?v=eKmf0YjZXqo
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1972 240Z US LHD ...
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