Removing halfshaft flanges
01-14-2007, 02:59 PM
#32
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Originally Posted by ppressle
May be a silly question, but, if you change out the ring gear bearings, don't you need to readjust the whole diff ?
If one changes the carrier bearings, only the diff assembly need to be shimmed to position it correctly. Chances are it will be correct, but one needs to check it for proper bearing preload, then move shims around (from left to right) to set backlash.
01-14-2007, 03:03 PM
#34
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Originally Posted by chris walrod
but one needs to check it for proper bearing preload, then move shims around (from left to right) to set backlash.
01-15-2007, 10:14 AM
#35
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Originally Posted by viperbob
Keep going Paul...
So do you have your rebuild kit yet? I generally find for the 993 that they are stupid expensive ($750 - 950 dealer list, yes you can get them cheaper). You wind up with a new, 2 clutch LSD that will be worn again very quickly. For a shop doing it with the cost of labor (obviously you are doing a DIY), it is just a little more to do a new Porsche Motorsport or Guard LSD. If you just want a TBD (torque biasing diff ala Quaiffe type) then it is almost a wash. On my car I installed a Guard unit and sold my dead diff on eBay. Thought I might get $100 or so. It went for almost $900 and I even said that it was dead and needed to be rebuilt in the ad. Crazy...
Keep going...
So do you have your rebuild kit yet? I generally find for the 993 that they are stupid expensive ($750 - 950 dealer list, yes you can get them cheaper). You wind up with a new, 2 clutch LSD that will be worn again very quickly. For a shop doing it with the cost of labor (obviously you are doing a DIY), it is just a little more to do a new Porsche Motorsport or Guard LSD. If you just want a TBD (torque biasing diff ala Quaiffe type) then it is almost a wash. On my car I installed a Guard unit and sold my dead diff on eBay. Thought I might get $100 or so. It went for almost $900 and I even said that it was dead and needed to be rebuilt in the ad. Crazy...
Keep going...
Paul mentioned to me that some of the stock housings allow rebuild with 2 friction plates per side, rather than 1 per side. I am hoping to be in that boat.
01-15-2007, 10:17 AM
#36
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Thread Starter
Originally Posted by Toga
Excuse my ignorance, but even my Harraps dictionnary doesn't have it: what are the shims?
Great job Paul! Could you post pics from the LSD opened?
Cheers
Great job Paul! Could you post pics from the LSD opened?
Cheers
01-22-2007, 02:12 PM
#37
Three Wheelin'
Thread Starter
Uncle!
After measuring the thicknesses of the friction plates, steels, etc on either side of the differential, Guard decided there was too much difference side to side and it would be better for me to send it there for rebuild. So, off it went this morning across the continient.
Inside I could see that one of the friction plates was worn smooth on one side. Also, I have quite thick spacer plates (4.50mm one side, 4.60mm on the other). Fingers crossed that Guard will be able to reduce this making room for two friction plates per side.
On a side note, Guard Transmission has been fantastic to deal with. They totally supported the DIY approach, but when things didn't measure exaxtly symmetrical side to side (the aforementioned spacer steels, for ex) they called and said I'd get better results if they had the housing, etc there to get the best stack-up they could. They even called back again to warn me to do a really good job packaging it, and that I should do what I could to avoid customs charges in each direction since the part is returning here.
I've attached some pics of part of my shipping solution, and of some of the internals, and a gratutious one of my new and old vises. First time with my friends camera, so some of the pics are not the best.
Inside I could see that one of the friction plates was worn smooth on one side. Also, I have quite thick spacer plates (4.50mm one side, 4.60mm on the other). Fingers crossed that Guard will be able to reduce this making room for two friction plates per side.
On a side note, Guard Transmission has been fantastic to deal with. They totally supported the DIY approach, but when things didn't measure exaxtly symmetrical side to side (the aforementioned spacer steels, for ex) they called and said I'd get better results if they had the housing, etc there to get the best stack-up they could. They even called back again to warn me to do a really good job packaging it, and that I should do what I could to avoid customs charges in each direction since the part is returning here.
I've attached some pics of part of my shipping solution, and of some of the internals, and a gratutious one of my new and old vises. First time with my friends camera, so some of the pics are not the best.
01-22-2007, 06:54 PM
#39
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Originally Posted by Paul902
After measuring the thicknesses of the friction plates, steels, etc on either side of the differential, Guard decided there was too much difference side to side
Originally Posted by Paul902
I have quite thick spacer plates (4.50mm one side, 4.60mm on the other). Fingers crossed that Guard will be able to reduce this making room for two friction plates per side.
01-22-2007, 07:15 PM
#40
Three Wheelin'
Thread Starter
Originally Posted by JasonAndreas
Did you ever get the 964 workshop manuals?
Never got 'em, but have the thing right apart now, anyway. It would be great to have them though.
Porsche sells spacers ($5-10USD) as small as 1mm thick and as large as 5mm in increments of 0.1mm
Never got 'em, but have the thing right apart now, anyway. It would be great to have them though.
Porsche sells spacers ($5-10USD) as small as 1mm thick and as large as 5mm in increments of 0.1mm
