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Do you have to run-in a rebuilt 915??
I'm due to collect the p-car after having the 915 overhauled on thursday. I'm sure the shop guys will tell me, but I don't want to go calling them every 5 minutes with meaningless crap between now and then!
Do the synchros need "bedding in" or something? I believe that they probably would, but I'm not sure. Can anyone help? Thanks AC ------------------ Adam Chaplin - 1976 911S Coupe |
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05-13-2001, 03:13 PM
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When I got my rebuilt 915, it shifted great, right out of the box. No one ever told me about a break-in period. On this board, there have been a lot of postings where rebuilders tell customers that they've got to wait a couple of thousand miles before they can expect their rebuilt transaxle to function correctly. To me, this sounds like sloppy workmanship -- that the rebuilders are buying time, certain that a healthy percentage of their customers will learn to live with a poorly-assembled 915 rather than endure a long series of visits back to the shop.
Did the factory tell anything like that to customers of new 911s? I think if a 915 is assembled to spec, with spec parts, it should function correctly. ------------------ Jack Olsen 1973 911 T (3.6) sunroof coupe jackolsen@mediaone.net |
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05-13-2001, 03:34 PM
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A fresh gearbox should feel a bit "tight", but as Jack says it should be able to hit all the gears smoothly and with no problems. I think many of the shifting difficulties that folks compain about after a rebuild are actually due to improperly adjusted shift linkages or clutches after the tranny is reinstalled.
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05-13-2001, 04:29 PM
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I'm not 100% sure about the 915, but the 901 transmission synchros will need a few hundred miles of wear-in or break-in time before they will begin to shift well. Up until then, it will be a bit stiff and difficult to get into gear...
-Wayne |
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05-13-2001, 05:30 PM
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Adam,
Although some describe 915 shifting as balky, a freshly rebuilt 915 is no different than a well-used one in needing a pause in the shifting 'rhythm' between gears. The 915 synchros can't be rushed, because opposing forces developed by the synchronizing mechanism always assure matched shaft/gear speeds before engagement takes place. Stiffness with new synchros may diminish after a few hundred miles of use, but the pause between gears is still needed throughout the life of the transaxle! The factory recommended that the transaxle gear oil be changed after 1000 miles in a new 915. That seems prudent with a rebuilt 915, as well! ------------------ Warren Hall 1973 911S Targa |
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05-13-2001, 05:59 PM
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Thanks guys!
I assumed that an oil change would be required after 1000 miles or so. It makes perfect sense. The shop doing the work for me are installing later model synchro energizers, brake shoes etc. Apparently, they've been upgraded many times since the original spec 76 ones. Should I use Swepco 201 when I change the oil? I mean, once it's broken in, should I try to protect it like that, or just use a good mineral oil? How many liters does the 915 take? Thanks again! If you were all here, I'd offer you all a drive of the finished product! Adam ------------------ Adam Chaplin - 1976 911S Coupe |
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05-14-2001, 02:46 AM
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Also, aftermarket synchros tend to be stiffer than genuine Porsche items so will take a while to loosen up.
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05-14-2001, 03:11 AM
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