Steering Rebuild Questions |
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Steering Rebuild Questions |
DennisV |
Sep 24 2023, 11:25 AM
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#1
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Member Group: Members Posts: 468 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California |
Decided to tackle rebuilding the steering components of our 1970 914-6 this weekend. I have done a lot of searching and YouTube watching, but still have a number of questions:
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914Sixer |
Sep 24 2023, 05:42 PM
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#2
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
Rebuilding the steering rack is a job best left to experts. Requires special measuring tools.
Yes your steering rack is the same as the stock 914 BUT at assembly in Porsche plant they used a the 911 rack with 914 shaft. The 911 rack had a different openings. Starting in 1973 both 911 and 914 used the same rack up to 1989. |
r_towle |
Sep 24 2023, 05:45 PM
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#3
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
The bottom picture, the gear and all pieces to hold it in place.
I seem to recall there were three types (sizes of gear) over time There was also a “quick rack” kit out there for less turning of the steering wheel. I rebuilt a few back in the day, using other racks for parts…lots of measuring. |
Mikey914 |
Sep 24 2023, 09:39 PM
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#4
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The rubber man Group: Members Posts: 12,667 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
We originally planned to offer a rebuild kit. Problem is there are 6 variants that can fit into the 914. Of these each has other variations. That and the tolerance on racks require perfect alignment and tension must be set correctly on the drag puck. There are several variations of the drag puck as well as the bearings and even yokes.
We could put together kits, but the problem is identifying every variant, and then have to walk the customer through the rebuild without some of the required tools. This is why we do it as a service. Attached thumbnail(s) Attached image(s) |
Mikey914 |
Sep 24 2023, 09:49 PM
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#5
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The rubber man Group: Members Posts: 12,667 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
More
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burton73 |
Sep 24 2023, 09:56 PM
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#6
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burton73 Group: Members Posts: 3,524 Joined: 2-January 07 From: Los Angeles Member No.: 7,414 Region Association: Southern California |
Rebuilding the steering rack is a job best left to experts. Requires special measuring tools. Yes your steering rack is the same as the stock 914 BUT at assembly in Porsche plant they used a the 911 rack with 914 shaft. The 911 rack had a different openings. Starting in 1973 both 911 and 914 used the same rack up to 1989. ------------ I just want to point out that the steering shaft going from the steering wheel with U -joints to the steering rack is a different length on the 1985 Carrera rack or a 1978 911sc rack. One is shorter and I cannot remember which one is which. Part #21 on drawings. You can clearly see the difference on the 911 one in my picture of my spare set up from an 85 Carrera 911. Best Bob B |
Mikey914 |
Sep 24 2023, 09:57 PM
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#7
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The rubber man Group: Members Posts: 12,667 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
We vapor hone the castings and can provide Cerakote as an option.
Each shaft is polished, wear is checked and bushings honed to tolerances tighter than factory. We reassemble with white lithium grease so you can see they have been completely cleaned. The before and after. We have taken some that look like they were used as boat anchors and brought them back. Our process is through. Sure you can disassemble and replace grease and bearings. They don't always go back together without binding. Attached thumbnail(s) Attached image(s) |
Mikey914 |
Sep 24 2023, 10:03 PM
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#8
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The rubber man Group: Members Posts: 12,667 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
We do sell the assembled eyebolts as well as the kit mentioned
https://914rubber.com/rebuilt-eye-bolt-set-1 Please note that you get $30 back if you send in your cores. or buy just the bushing and shafts shown above. The big difference is we plated the the eye bolts and have done the work for you. Mark Attached thumbnail(s) |
Mikey914 |
Sep 24 2023, 10:07 PM
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#9
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The rubber man Group: Members Posts: 12,667 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
The bottom picture, the gear and all pieces to hold it in place. I seem to recall there were three types (sizes of gear) over time There was also a “quick rack” kit out there for less turning of the steering wheel. I rebuilt a few back in the day, using other racks for parts…lots of measuring. We also carry the reduction rack new rack and pinion. Problem is that it will not work on all racks due to variation in castings, bushings and bearings. It will reduce the throw to 2.5 turns of the steering wheel. |
mepstein |
Sep 25 2023, 05:38 AM
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#10
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914-6 GT in waiting Group: Members Posts: 19,272 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
Mark, what is the price to rebuild a 914 rack. I saw a couple different prices on the website. Thanks
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jhynesrockmtn |
Sep 25 2023, 07:14 AM
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#11
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Member Group: Members Posts: 418 Joined: 13-June 16 From: spokane wa Member No.: 20,100 Region Association: Pacific Northwest |
I rebuilt the front suspension of my Bumblebee this year. Everything but the carrier and torsion bars new. Added turbo tie rods as part of the process. I sent my rack to 914Rubber for rebuild as part of this process. Very happy with the results.
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technicalninja |
Sep 25 2023, 07:52 AM
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#12
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Senior Member Group: Members Posts: 1,219 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region |
I've rebuilt multiple rack and pinions over my automotive career.
I've done a 964 PS rack as I could find no-one local that I trusted. Same with a rack out of a 93 Honda Prelude with 4-wheel steering. Everyone and their uncle told me the Honda rack was the same for 2wh vs 4 wh. They were all wrong! It was significantly different and had I let someone else do it the 4wh steer would have never worked again! By perusing this forum, I find that there are many different possible combinations for an early 914 rack. Even with my extensive experience I'd just send mine to 914 rubber if I needed one... Not worth the hassle if there are multiple variations. Needs to go to someone who has seen and is aware of the pitfalls. |
Mikey914 |
Sep 25 2023, 10:44 AM
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#13
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The rubber man Group: Members Posts: 12,667 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
Mark, what is the price to rebuild a 914 rack. I saw a couple different prices on the website. Thanks @mepstein Here’s a video about what we do https://youtu.be/fYrZ9Fga5JA We have really 2 prices. The more expensive for option A,B, and C is outright. We will refund the core, but charge enough to make sure it comes back if you send back in 90 days. Type A Outright https://914rubber.com/rebuild-service-for-s...006-91434701401 Exchange https://914rubber.com/rebuilt-steering-rack-type-a-exchange Steering rack Type A: Type A racks are the most common on 914's and even have a casting number that includes 914 in it. 914.347.010.01, 914.347.010.06, 914.347.014.01 are the casting numbers of the type A rack. They are part of the casting and not stamped. Type B Outright https://914rubber.com/rebuilt-steering-rack...ber-91434701006 Exchange https://914rubber.com/rebuild-service-for-s...ber-91434701006 Steering rack Type B: These racks are clearly marked ZF. They do not have placards, nor do they have the bulbous body like the C racks. They were interchangeable with 911s of the same period. They are completely different castings than the type A or C. A notable difference are the stampings: ( 7820 900 165 - 20 137 ), (7820 900 166 20 214 ), and (7826955 112 / 20 286 ). Type C Outright really depends on rack, many variables we may have what you need, we may not. Recommend dropping us an email with pictures Scott at 914rubber.com Exchange https://914rubber.com/steering-rack-type-c-rebuild-service The listing is a little confusing in that it looks like it’s a purchase, but we may not have stock to do so. Steering rack Type C: There are several versions of Type C steering racks. Most are early 912, or 911 racks. They are characterized by the oversized bulb shape at the center. Known serial numbers are 78 20 501 115 and 78 20 900 129. Hopefully the video helps. |
mepstein |
Sep 25 2023, 11:24 AM
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#14
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914-6 GT in waiting Group: Members Posts: 19,272 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
I think I get it now. Thanks!
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DennisV |
Oct 7 2023, 12:02 PM
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#15
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Member Group: Members Posts: 468 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California |
Setting the tension seems important, but other than that I'm not seeing what is dissuading folks from doing this themself. What are the pitfalls that am I missing?
Clearly there are variations and difficulty in finding some of the parts. Most of the bushing are available from 914 Rubber. The few odd bits I had to source that might help others:
On disassembly, ours looks pretty good save the broken puck. I'm going to give this a go this weekend. I might regret it down the road, but time will tell. P.S. I'm not trying to take anything away from the service that Mark / 914 Rubber offer. The end results look great and they clearly have satisfied customers. I bought what parts I could from them. |
Montreal914 |
Oct 8 2023, 09:48 AM
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#16
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Senior Member Group: Members Posts: 1,559 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California |
(IMG:style_emoticons/default/popcorn[1].gif)
YouTube video I found. I didn't see the Delrin piece in it though. This was solid metal. (IMG:style_emoticons/default/confused24.gif) Delrin seems smoother, but maybe prone to wear faster? https://www.youtube.com/watch?v=kjg82Gv_-Go |
DennisV |
Oct 9 2023, 02:23 PM
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#17
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Member Group: Members Posts: 468 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California |
Here is a shot of ours after being disassembled and cleaned. I thought it might be of interest to others as it is a variation I have not seen in other threads or videos. The thrust ring is held in place by a threaded housing cover. There were no shims. I assume the tension is determined by how tight you screw it down.
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Mikey914 |
Oct 9 2023, 03:30 PM
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#18
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The rubber man Group: Members Posts: 12,667 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
You are correct. The internal housing has to be removed to clean it throughout. If not any solvents used will get trapped diluting new grease and contaminating new grease.
We refer to this as a type c rack. |
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