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Registered
Join Date: Sep 2007
Location: Norway
Posts: 358
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Charging problems
Hi. My son's 924 har developed charging problems. We hope it is the volt-regulator that is not working.
What is the easiest way of changing it? |
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01-02-2011, 02:40 AM
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Registered
Join Date: Jul 2010
Posts: 104
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First thing you do is remove the battery cable.
If your alternator has a cold air intake on the back, then this will first have to be removed. In some cases, you will need to completely undo the alternator to get to the nuts. Then it's a simple matter of undoing the two screws that hold in the VR/ brush unit. Pop in the new one, and you're good to go. This photo is what a typical (not necessarily Porsche) Bosch alternator looks like, without the air supply: http://www.coolcatcorp.com/faqs/LucasBosch5.jpg |
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01-02-2011, 01:24 PM
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Redline Racer
Join Date: Jan 2007
Posts: 2,444
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Good to check the slip rings and clean them while you're in there.
__________________
1987 silver 924S made it to 225k mi! Sent to the big garage in the sky |
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01-03-2011, 10:51 PM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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Another while-you-have-it-out suggestion (if you do take it out), besides cleaning the slip-rings, would be to either replace (if any play) or re-lube the shaft bearings.
__________________
>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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01-04-2011, 05:44 AM
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Redline Racer
Join Date: Jan 2007
Posts: 2,444
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So those bearings are oilable and not sealed?
__________________
1987 silver 924S made it to 225k mi! Sent to the big garage in the sky |
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01-05-2011, 12:29 PM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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NO! They are GREASE lubricated. But they use rubber seals, not the metal shields. What you do, is pop a "grease injection needle" onto the grease gun's zirk fitting. Then gently run the tip of the "hypodermic" needle under the inner lip of the rubber seal, with the opening hole facing into the bearing, and pump some grease into it. Wipe off any excess grease. This will greatly extend the service life (almost to infinity) of ANY bearing of this style. When bearings are new, they contain some grease. But I have found that the amount in them varies greatly, from a somewhat decent amount, to iffy, to very little, to occasionally even none. I'm convinced that this is the reason why some bearings fail sooner than others. So I always add extra grease, even to brand new bearings. I don't believe that I have ever had a bearing fail yet, which I added extra grease to. And you CAN also do the metal-shield bearings, but you need to pierce into the shield (use a pick, so you don't damage the grease needle's tip), making a hole in it, where you pump the grease into. I then seal the hole by first wiping the shield clean, and then placing a small "patch" made of aluminum tape over it.
I'm sure that the bearing manufacturers won't be happy that I exposed this information. It can only hurt their sales numbers for replacement bearings. But my primary objective is to help out my fellow p-car owners. Maybe this info ought to become "sticky"? |
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01-06-2011, 05:31 AM
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