Steering Rack Bushes - Rubber or Delrin
09-10-2018, 11:21 PM
#16
Rennlist
Basic Site Sponsor
Basic Site Sponsor
I don't understand solid aluminum, at all.....not even a tiny little bit!
There is going to be harmonics/wear between the steering rack and the aluminum sleeve....that's a given.
What mount are you planning on using in that steering rack bushing hole, once the aluminum bore is worn?
Come on guys. Just because someone makes it and offers it, doesn't automatically mean you should use it.
Try to be 5% smarter than what you are working on!
There is going to be harmonics/wear between the steering rack and the aluminum sleeve....that's a given.
What mount are you planning on using in that steering rack bushing hole, once the aluminum bore is worn?
Come on guys. Just because someone makes it and offers it, doesn't automatically mean you should use it.
Try to be 5% smarter than what you are working on!
__________________
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
09-12-2018, 05:32 AM
#17
Racer
I don't understand solid aluminum, at all.....not even a tiny little bit!
There is going to be harmonics/wear between the steering rack and the aluminum sleeve....that's a given.
What mount are you planning on using in that steering rack bushing hole, once the aluminum bore is worn?
Come on guys. Just because someone makes it and offers it, doesn't automatically mean you should use it.
Try to be 5% smarter than what you are working on!
There is going to be harmonics/wear between the steering rack and the aluminum sleeve....that's a given.
What mount are you planning on using in that steering rack bushing hole, once the aluminum bore is worn?
Come on guys. Just because someone makes it and offers it, doesn't automatically mean you should use it.
Try to be 5% smarter than what you are working on!
09-12-2018, 05:44 AM
#18
Drifting
Thread Starter
In the end I didn't fit the Delrin, mainly because I don't have access to a press
Refitting the rack would have been fine if I hadn't spent hours fighting the coupling
With hindsight perhaps I should have removed it from the steering shaft and fitted it to the rack first
Refitting the rack would have been fine if I hadn't spent hours fighting the coupling
With hindsight perhaps I should have removed it from the steering shaft and fitted it to the rack first
09-12-2018, 05:51 AM
#19
Racer
20t hydraulic Press is on my list once I make room for it in the garage. Bushes and bearings on the rear subframe assembly dont look like theyll come out without a fight.
Centering bolt sent in todays post.
Centering bolt sent in todays post.
09-12-2018, 08:15 AM
#20
Drifting
In the end I didn't fit the Delrin, mainly because I don't have access to a press
Refitting the rack would have been fine if I hadn't spent hours fighting the coupling
With hindsight perhaps I should have removed it from the steering shaft and fitted it to the rack first
Refitting the rack would have been fine if I hadn't spent hours fighting the coupling
With hindsight perhaps I should have removed it from the steering shaft and fitted it to the rack first
Use one of bolts from the rack and a couple of big washers to press the bushes in.
09-12-2018, 09:39 AM
#21
Drifting
Thread Starter
I meant to say that I didn't fit the Delrin because I don't have access to a press in order to remove the old rubber bushes
And I can't even remember how I did it last time, because I actually fitted these bushes some years ago
The problem is I've had the car so long now that I seem to be redoing a number of jobs (and I'm struggling to remember how I did them originally)
I'm also running out of time because I have to have the 928 ready since it's looking increasingly unlikely that I'll have the Cerbera back together for the Ring in a couple of weeks time
09-12-2018, 09:56 AM
#22
You don't need a press to remove the old bushes but it certainly does make it a lot easier. A big time saver so worth the money if you have the space in my opinion. Air chisel/hammer helps a lot on this job as well.
For fitting I seem to remember just tapping the delrin bushes in with a dead-blow hammer.
Duncan
For fitting I seem to remember just tapping the delrin bushes in with a dead-blow hammer.
Duncan
09-12-2018, 12:31 PM
#23
Drifting
After lots of investigation noting that there are MANY aluminum steering rack bushings for other cars, I went with aluminum.
No need to remove steering rack or its lines.
Also, there is no need for a press to remove the original bushings, just burn them out with a small map/propane torch - less than 5 minutes per bushing.
Next, chisel out the outer bushing shell, that's another 5 minutes per bushing.
Install of new bushings is super simple, just tap them in.
Driving, they were a BIG improvement for me with no additional vibration/harshness.
My recommendation is go with the aluminum ones.
No need to remove steering rack or its lines.
Also, there is no need for a press to remove the original bushings, just burn them out with a small map/propane torch - less than 5 minutes per bushing.
Next, chisel out the outer bushing shell, that's another 5 minutes per bushing.
Install of new bushings is super simple, just tap them in.
Driving, they were a BIG improvement for me with no additional vibration/harshness.
My recommendation is go with the aluminum ones.
09-12-2018, 06:53 PM
#24
Nordschleife Master
Paul I didn't need to remove rack entirely to fit the Delrin bushes, but I did have it unbolted from x-member of course, and removed the PS lines.
The original rubber bushes weren't bad at all so it was just a WYIT during an engine mount change — there wasn't much in the way of leaked oil on the originals. I replaced inner and outer steering rods at same time which had about 75K on them, so it's impossible to say what difference the new bushes made, but afterwards the steering felt very smooth and positive, and I wasn't aware of any extra vibration at all. I understand the aluminium bushes will create noticeable vibration.
The original rubber bushes weren't bad at all so it was just a WYIT during an engine mount change — there wasn't much in the way of leaked oil on the originals. I replaced inner and outer steering rods at same time which had about 75K on them, so it's impossible to say what difference the new bushes made, but afterwards the steering felt very smooth and positive, and I wasn't aware of any extra vibration at all. I understand the aluminium bushes will create noticeable vibration.
I had the rack unbolted and hanging.
I used a hammer & cold chisel to fold the metal part of the rubber bushing over, and then tapped it out. It probably took 15 - 30 min to do each one, but I was being careful with the hammer. The last one came out a lot faster than the first.
Air would have cut the time to a few minutes each.
I used a C-clamp to 'press' the derlin bushings in.
Mine were original (I think) and had maybe 80k miles on them. I didn't notice any huge difference in the steering, but it was an "over winter" project, so it was 4 months or so from the last time with the original bushings to the first time with the derlin.
09-14-2018, 02:11 PM
#25
Three Wheelin'
This was similar to my experience.
I had the rack unbolted and hanging.
I used a hammer & cold chisel to fold the metal part of the rubber bushing over, and then tapped it out. It probably took 15 - 30 min to do each one, but I was being careful with the hammer. The last one came out a lot faster than the first.
Air would have cut the time to a few minutes each.
I used a C-clamp to 'press' the derlin bushings in.
Mine were original (I think) and had maybe 80k miles on them. I didn't notice any huge difference in the steering, but it was an "over winter" project, so it was 4 months or so from the last time with the original bushings to the first time with the derlin.
I had the rack unbolted and hanging.
I used a hammer & cold chisel to fold the metal part of the rubber bushing over, and then tapped it out. It probably took 15 - 30 min to do each one, but I was being careful with the hammer. The last one came out a lot faster than the first.
Air would have cut the time to a few minutes each.
I used a C-clamp to 'press' the derlin bushings in.
Mine were original (I think) and had maybe 80k miles on them. I didn't notice any huge difference in the steering, but it was an "over winter" project, so it was 4 months or so from the last time with the original bushings to the first time with the derlin.
Not a big difference for me, but I’m only street driving, the difference could be perceptible on a track but I don’t know.
Actually, if you want a more tactile and responsive driving feel... consider a 350mm steering wheel. That seemed to make the biggest difference on my car.
09-14-2018, 06:38 PM
#27
Drifting
Sorry, I wasn't being very clear before
I meant to say that I didn't fit the Delrin because I don't have access to a press in order to remove the old rubber bushes
And I can't even remember how I did it last time, because I actually fitted these bushes some years ago
The problem is I've had the car so long now that I seem to be redoing a number of jobs (and I'm struggling to remember how I did them originally)
I'm also running out of time because I have to have the 928 ready since it's looking increasingly unlikely that I'll have the Cerbera back together for the Ring in a couple of weeks time
I meant to say that I didn't fit the Delrin because I don't have access to a press in order to remove the old rubber bushes
And I can't even remember how I did it last time, because I actually fitted these bushes some years ago
The problem is I've had the car so long now that I seem to be redoing a number of jobs (and I'm struggling to remember how I did them originally)
I'm also running out of time because I have to have the 928 ready since it's looking increasingly unlikely that I'll have the Cerbera back together for the Ring in a couple of weeks time
09-15-2018, 11:12 AM
#28
Drifting
I installed Delrin during motor mounts and OPG jobs. To remove the originals (two were mushy from oil soaking) I drilled holes to perforate the rubber, plucked out the centers and pried the outers sleeves out. Installed the Delrin bushes with a large C-clamp. I immediately noticed the steering was much more crisp and positive feeling. No noticeable vibration. I'd guess that fresh OEM bushings would feel similar to Delrin, relative to how the old ones allowed a bit of movement (I observed it while my wife turned the steering wheel).