 Ring and Pinion Backlash, What's everyone doing? |
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| Matt Romanowski |
 Apr 15 2013, 07:11 PM
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#1
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Senior Member  Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507  |
For the folks who are rebuilding their own transmissions, what are you using for a backlash measurement? The manual says around .007, but that seems a little tight. We're trying to get some temperature out of the transmission and were thinking about running a little looser. Anyone tried that?
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| 914forme |
Oct 9 2013, 07:17 AM
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#2
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Times a wastin', get wrenchin'! Group: Members Posts: 3,896 Joined: 24-July 04 From: Dayton, Ohio Member No.: 2,388 Region Association: None 
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Okay the magic mystery tool is really not needed. Okay thats is a miss statement, but if you want to make one, why not measure your own diff, get the exact center. Mark / Machine the position on the diff so you can measure from the same spot each time. Grab another side cover, drill a nice hole in it above the pinion and then use a bore gauge to measure your depth , a little math and you just replaced the VW and Porsche super secret tools.
You don't even need a fancy bore gauge a simple T gauge and a set of calipers will do the trick. I used this method after talking to Groot about it. And I do believe it worked. I ran that trans for 6 years now, no signs of bad things happening. I pulled the side cover last month and pulled the LSD out. Ring and Pinion where in perfect shape. It might have been luck, I tend to think it was just taking time and doing the math to get it all right. YMMV Now Pinion Backlash, I hate doing that, shims, pulling in and out. Subaru got that one right on the 5MT. Two bolts and a spanner wrench. Done. |
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| pcar916 |
Oct 9 2013, 08:24 AM
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#3
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Is that a Lola? Group: Members Posts: 1,523 Joined: 2-June 05 From: Little Rock, AR Member No.: 4,188 Region Association: None
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QUOTE(914forme @ Oct 9 2013, 08:17 AM)  Now Pinion Backlash, I hate doing that, shims, pulling in and out. Subaru got that one right on the 5MT. Two bolts and a spanner wrench. Done. An inverted 915/930 is ok too. The R&P is on the "right" side so the gear-stack doesn't have to come out to change spacers/shims. |
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Posts in this topic
Matt Romanowski Ring and Pinion Backlash Apr 15 2013, 07:11 PM
Mark Henry I wouldn't try that, maybe it's time for a... Apr 15 2013, 08:34 PM
Matt Romanowski
I wouldn't try that, maybe it's time for ... Apr 16 2013, 05:15 AM Mark Henry I don't race so mine is just stock.
But, I... Apr 16 2013, 08:02 AM pcar916 :agree: The backlash and contact pattern go work... Apr 16 2013, 08:16 AM Matt Romanowski You can have good settings and contact and still b... Apr 16 2013, 08:29 AM Dr Evil I use the factory tool, or at least a clone of it.... Apr 16 2013, 11:58 AM Jon B The factory states that .012-.018 is tolerance... ... Oct 6 2013, 10:32 PM Jon B
I use the factory tool, or at least a clone of it... Oct 7 2013, 10:49 PM Dr Evil
[quote name='Dr Evil' post='1850919' date='Apr 16... Oct 8 2013, 10:34 AM 396
[quote name='Dr Evil' post='1850919' date='Apr 1... Oct 8 2013, 12:31 PM Dr Evil Not using inches, why would you assume so? Decimal... Oct 6 2013, 10:35 PM Jon B
Not using inches, why would you assume so?
I didn... Oct 6 2013, 10:57 PM 396
Not using inches, why would you assume so?
Hi, I... Oct 7 2013, 05:44 PM Dr Evil Sure, whatever Oct 7 2013, 12:26 AM Matt Romanowski Jon - Good call.
As an update, we're going to... Oct 7 2013, 06:19 AM 76-914
Jon - Good call.
As an update, we're going t... Oct 7 2013, 08:19 AM Jon B
As an update, we're going to pull the transmi... Oct 7 2013, 10:00 PM r_towle Matt, what kind of differential do you use?
Rich Oct 7 2013, 07:56 PM Matt Romanowski
Matt, what kind of differential do you use?
Rich... Oct 7 2013, 11:32 PM zambezi
[quote name='Jon B' post='1936884' date='Oct 6 20... Oct 7 2013, 08:18 PM Dr Evil Ya, in my free time ;) Sorry, I am at my 9a-9p job... Oct 8 2013, 12:41 PM Dr Evil Search on Pelican as the guy who made them had a t... Oct 8 2013, 12:41 PM jimkelly see post #43
http://www.914world.com/bbs2/index.p... Oct 8 2013, 12:47 PM Dr Evil Um, no. That is not it. Oct 8 2013, 12:49 PM Matt Romanowski Post 21 shows one though. Oct 8 2013, 01:25 PM sixnotfour http://forums.pelicanparts.com/porsche-911...tml#p... Oct 8 2013, 01:56 PM Dr Evil
http://forums.pelicanparts.com/porsche-911...tml#... Oct 8 2013, 02:42 PM r_towle Matt,
Have you considered replacing the diff hous... Oct 8 2013, 07:44 PM Matt Romanowski
Matt,
Have you considered replacing the diff hou... Oct 8 2013, 08:25 PM Jon B We have a billet intermediate plate and side plate... Oct 8 2013, 09:35 PM Matt Romanowski
We have a billet intermediate plate and side plat... Oct 8 2013, 10:46 PM Jon B Matt,
You realize that's alot of engine and t... Oct 8 2013, 11:32 PM Matt Romanowski
Matt,
You realize that's alot of engine and ... Oct 9 2013, 06:07 AM r_towle
Matt,
You realize that's alot of engine and ... Oct 9 2013, 11:19 AM Jon B Can you replace the ring and pinion with the 8 too... Oct 9 2013, 12:07 PM John I use the VW tools. Got them to do 915's, but... Oct 8 2013, 07:52 PM Jon B John,
Those are excellent tools, and Porsche-reco... Oct 8 2013, 09:18 PM John
John,
Those are excellent tools, and Porsche-rec... Oct 9 2013, 08:18 PM Dr Evil Agreed, I hate setting preload. <_< Oct 9 2013, 08:23 AM Dr Evil Going to more teeth on the pinion of a 901 will ac... Oct 9 2013, 12:10 PM Jon B Going to more teeth on the pinion of a 901 will ac... Oct 9 2013, 02:08 PM Dr Evil I disagree. When it comes to the 901 pinion, more ... Oct 9 2013, 02:19 PM Jon B More teeth increase the gear's load bearing su... Oct 9 2013, 03:01 PM Dr Evil
We can disagree.
In any case it's really no... Oct 9 2013, 03:08 PM Dr Evil Late, but none the less relevant. Oct 9 2013, 04:30 PM Jon B It only began in April, so not quite a resurrectio... Oct 9 2013, 05:13 PM Dr Evil Yup, relevant, addressed two misplaced decimals, I... Oct 9 2013, 05:31 PM Jon B John,
I have more than one bar, but keep the smal... Oct 9 2013, 10:00 PM Jon B 914 Transmission
Measuring differential bearing pr... Oct 11 2013, 03:46 PM 396 Thanks for the indepth education. Now we know who ... Oct 11 2013, 03:54 PM Jon B 914 Transmission
Setting Ring & Pinion
Factor... Oct 11 2013, 04:03 PM |
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