 901 ZF LSD rebuild, 30 years of parts collecting pays off |
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| mgphoto |
 Feb 18 2016, 01:40 PM
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#1
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"If there is a mistake it will find me"  Group: Members Posts: 1,339 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California  |
Hello,
I started collecting parts of this project 30 years ago and the last parts have fallen into place. In this post I hope to clear up some confusion and convey some of what I found trying to complete this project. First piece  purchased form PAR in Yonkers NY 1986 914.332.209.00 casting number 51D The LSD found its way to me in 2013 from the venerable Cap'n Krusty  The diff needed some work as it was missing internal spring plates which are NLA.  Item number 4 in this factory illustration. This part places tension on the clutch pack which is measured as drag. The factory spec on this is 29 - 58 ft. lbs This item can be replaced by what is now called a "cup" spring from and early 928 part no. 928.332.555.00  seen here as item number 10 As for the internal wear parts, the 914 parts are NLA but, get this they are replaced by mostly 917 parts! WAY COOL. Just the beginning, stay tuned! Mike |
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| oldie914 |
Feb 21 2016, 05:36 AM
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#2
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Member Group: Members Posts: 102 Joined: 2-May 10 From: Germany Member No.: 11,680 Region Association: None |
I decided to inventory my flange collection and provide part numbers and some better dimensions. The attached picture shows 6 flange pairs. From left to right they are:
1. 901 332 209 15/21 used in the early 1969 911 with Aluminum case. Total length 109mm. Length of extension into differential is 56.5mm. Diameter 34mm. 2. 901 332 209 22 used in 911 with magnesium case from mid 1969 to 1971. Total length 105mm. Extension 56.5mm. Diameter 35mm. 3. 914 Flange. Total length 99.5mm. Extension 56.5mm. Diameter 35mm. 4. 901 332 220 915/21 used for mag case 911/915 with LSD. Total length 109mm. extension 61mm. Diameter 35mm. 5. 923 332 209 02 small flange used in 911SC after about 1981. Total length 109mm. Extension 56.5mm. Diameter 35mm. 6. 923 332 209 04/05 used in early 915 transmission. Same as 901 332 209 22 except total length is 106mm. Then I stuck the flanges into the matching differential carriers and measured the flange to flange spacing. The 901 and 911 were 260mm. The 915 was 262mm and the 914 was 250mm. The last picture compares the LSD flange to 901 332 209 22. Looks like there is enough metal there to allow the flange to be ground down to fit a LSD differential. Total length of the modified flange would be 4mm less than the original but that should not make a difference.     |
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Posts in this topic
mgphoto 901 ZF LSD rebuild Feb 18 2016, 01:40 PM
jd74914 I didn't realize there was a factory Salisbury... Feb 18 2016, 02:09 PM mgphoto OK here are a few tidbits about the ZF LSD.
Below... Feb 19 2016, 11:16 PM Mueller Maybe you can find a shop that does hard turning?
... Feb 20 2016, 12:06 AM oldie914 The 901 332 209 21 flange was used for the early 1... Feb 20 2016, 04:09 AM
mgphoto
The 901 332 209 21 flange was used for the early ... Feb 20 2016, 11:12 AM rgalla9146 This is great information.
I look forward to t... Feb 20 2016, 07:09 AM mgphoto Hey oldie914 thanks, I was hoping you could help w... Feb 21 2016, 10:36 AM 396 Thanks for this detailed information / education. ... Feb 21 2016, 02:11 PM rgalla9146 Are the 928 and 917 (!!!!!... Feb 21 2016, 09:46 PM mgphoto
Are the 928 and 917 (!!!!!... Feb 23 2016, 10:02 AM oldie914 When installing a new seal, clean the rust off the... Feb 22 2016, 03:20 AM mgphoto
When installing a new seal, clean the rust off th... Feb 22 2016, 09:51 PM veekry9 For those desiring a custom flange,I'm sure th... Feb 22 2016, 11:55 AM sixnotfour
911 owners do this more often than not when back... Feb 22 2016, 12:43 PM 396
911 owners do this more often than not when bac... Feb 22 2016, 01:44 PM ThePaintedMan Not to hijack, but I thought this was pertinent:
... Feb 22 2016, 07:05 PM mgphoto OK so at this point I though I should get some ref... Feb 23 2016, 09:49 AM mgphoto OK here is the list of internal parts and my measu... Feb 28 2016, 10:57 PM mgphoto Now for the measurements of some new parts.
Belle... Mar 6 2016, 04:36 PM 396
Now for the measurements of some new parts.
Bell... Mar 6 2016, 07:08 PM 396
Now for the measurements of some new parts.
Bel... Mar 8 2016, 12:30 PM mgphoto
[quote name='396' post='2312227' date='Mar 6 2016... Mar 1 2017, 08:46 PM jd74914 The diff looks so similar to the BMW e30 LSDs. IIR... Mar 6 2016, 07:32 PM mgphoto
The diff looks so similar to the BMW e30 LSDs. II... Mar 7 2016, 12:03 PM jd74914 Thank you! Now I just have to find my BMW mode... Mar 7 2016, 01:10 PM r_towle You gave me hope.
I don't feel like such a pro... Mar 8 2016, 08:46 PM mgphoto Another small step for me, one giant leap for my t... Apr 10 2017, 06:48 PM rgalla9146 Is it possible to test a LSD on the bench ?
Can... Apr 10 2017, 07:38 PM mgphoto
Is it possible to test a LSD on the bench ?
Ca... Apr 11 2017, 10:29 AM 914forme Clamp one side in a vice.
Take a torque wrench, y... Apr 11 2017, 10:45 AM jd74914 Not sure that will truly give you a full assessmen... Aug 31 2017, 10:20 AM mgphoto
Not sure that will truly give you a full assessme... Aug 31 2017, 10:56 AM jd74914
Since I am using new friction plates, the unit wi... Aug 31 2017, 12:08 PM |
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