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Post by Jens Munk on Jan 24, 2020 12:14:11 GMT
What kind of lubrication do you recommend when pressing new front suspension rubber bushings in place? None? Dish washing? Hand soap? Special lube?
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Post by johnwp5bcoupe on Jan 24, 2020 13:10:00 GMT
Hi Jens not washing up liquid is full of salt! I use silicone grease
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Post by djm16 on Jan 25, 2020 1:35:34 GMT
The answer will depend on the type of bushing you use.
Polyurethane bushes are harder material, and are designed to rotate on the pin as the suspension goes up and down, so silicone grease, +- nickel antiseize is appropriate.
Rubber bushes are designed to grip the pin and not rotate, only distort with suspension movement. So paradoxically, lubricating them may shorten their life by allowing some rotation.
Having said that, I used a trace of castor grease when I had rubber bushes, as castor seems to oxidise to some extent and allow the rubber to grip.
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Post by Ken Nelson on Jan 25, 2020 4:06:35 GMT
Wouldn't a small amount of either red rubber brake grease or silicone grease also be OK to use to push the rubber bushings in with?
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Post by djm16 on Jan 25, 2020 5:37:14 GMT
Wouldn't a small amount of either red rubber brake grease or silicone grease also be OK to use to push the rubber bushings in with? Bear in mind that my reply is based on first principles, not on wide observation. Silicon grease is highly stable and will continue to lubricate and allow unwanted rotation long after installation. My experience with castor grease is that it goes gummy with age and exposure. YMMV. |
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Post by enigmas on Jan 25, 2020 10:18:31 GMT
Ken...yes! I'm currently rebushing the front suspension of my ZB MG Magnette.
* Just remember don't fully tighten the bushing nuts until you have the full load of the vehicle acting on them. Bounce the car up and down then tighten the nuts. The Metalastic bushes (Bonded rubber to steel sleeve...rear wishbones on the P5) will shear early in their life if you fail to use this method.
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Post by Jens Munk on Jan 30, 2020 9:51:53 GMT
Which polyurethane bushings are you using for your P5 wishbones? Source? The answer will depend on the type of bushing you use. Polyurethane bushes are harder material, and are designed to rotate on the pin as the suspension goes up and down, so silicone grease, +- nickel antiseize is appropriate. Rubber bushes are designed to grip the pin and not rotate, only distort with suspension movement. So paradoxically, lubricating them may shorten their life by allowing some rotation. Having said that, I used a trace of castor grease when I had rubber bushes, as castor seems to oxidise to some extent and allow the rubber to grip. |
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Post by enigmas on Jan 30, 2020 10:57:38 GMT
The following article is a very interesting read if you really want to know the differences between rubber and poly bushes. Rubber versus Polyurethane BushesNB. I fitted red poly bushes to the inner lower front suspension arm of my MK3 coupe well over a decade ago when the power steering unit was constantly weeping over this particular bush. I'd replaced the rubber bush several times over the years due to ATF rotting it out. Perhaps a year or so later I had the power steering box properly rebuilt to remedy the weeping issue. The red poly bush is currently still in place, in good shape and it doesn't squeak! |
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Post by Jens Munk on Jan 30, 2020 11:57:20 GMT
Thanks for the info. I see that Scotts has them:
Pricey, though.
Jens.
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Post by djm16 on Feb 2, 2020 22:33:42 GMT
I just went to a couple of local suspension specialists with the dimensions, bought the ones closest in size for about $10, and then cut them down to the right length. They came in fancy packaging and included crush tubes that I did not use.
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