Alternator options and install questions
03-28-2015, 02:47 PM
#1
Alternator options and install questions
Regarding my MY74 911. Indy tells me my alternator needs to be replaced (as well as battery). It has an internal voltage regulator. I asked about rebuilding mine and their recommendation was to purchase new from Valeo for $295. Labor quote is 4 hours; is it really that difficult to access in this early model year car?
So my questions; am I getting the best advice on the alternator replacement and is 4 hours reasonable to "remove and replace" an alternator? Porsche is located in Miami for what it's worth.
Update: As per Pelican, "all 911's up to 1981 has external regulators." So either the shop is incorrect, the Pelican parts tech article is wrong, or at some point a newer (post 1981) alternator was installed with an internal regulator (if that is even possible). Comments appreciated here as well.
So my questions; am I getting the best advice on the alternator replacement and is 4 hours reasonable to "remove and replace" an alternator? Porsche is located in Miami for what it's worth.
Update: As per Pelican, "all 911's up to 1981 has external regulators." So either the shop is incorrect, the Pelican parts tech article is wrong, or at some point a newer (post 1981) alternator was installed with an internal regulator (if that is even possible). Comments appreciated here as well.
Last edited by u7t2p7; 03-28-2015 at 02:58 PM. Reason: Added a quote from Pelican Parts Technical Guide
03-29-2015, 12:03 AM
#2
Im 99% sure the voltage regulator is external
Its not a hard job you need a special tool to hold the pulley
Realistically its a 2 hour job max to replace
Heres what you need
Valeo is oem 50 amp
Try rock auto or pelican
Heres the job step by step
http://www.pelicanparts.com/techarti...lt_replace.htm
Your part
http://www.ebay.com/itm/New-OEM-Alte...20b436&vxp=mtr
Its not a hard job you need a special tool to hold the pulley
Realistically its a 2 hour job max to replace
Heres what you need
Valeo is oem 50 amp
Try rock auto or pelican
Heres the job step by step
http://www.pelicanparts.com/techarti...lt_replace.htm
Your part
http://www.ebay.com/itm/New-OEM-Alte...20b436&vxp=mtr
04-03-2015, 11:53 AM
#3
Three Wheelin'
What is the best, most powerful, most reliable power generation system available for these cars? Every solution I've read about has issues (new Valeo is weak, Paris-Rhone is prone to failure, Bosche rebuilds don't seem to last).
04-03-2015, 03:15 PM
#4
Burning Brakes
Regarding my MY74 911. Indy tells me my alternator needs to be replaced (as well as battery). It has an internal voltage regulator. I asked about rebuilding mine and their recommendation was to purchase new from Valeo for $295. Labor quote is 4 hours; is it really that difficult to access in this early model year car?
So my questions; am I getting the best advice on the alternator replacement and is 4 hours reasonable to "remove and replace" an alternator? Porsche is located in Miami for what it's worth.
Update: As per Pelican, "all 911's up to 1981 has external regulators." So either the shop is incorrect, the Pelican parts tech article is wrong, or at some point a newer (post 1981) alternator was installed with an internal regulator (if that is even possible). Comments appreciated here as well.
So my questions; am I getting the best advice on the alternator replacement and is 4 hours reasonable to "remove and replace" an alternator? Porsche is located in Miami for what it's worth.
Update: As per Pelican, "all 911's up to 1981 has external regulators." So either the shop is incorrect, the Pelican parts tech article is wrong, or at some point a newer (post 1981) alternator was installed with an internal regulator (if that is even possible). Comments appreciated here as well.
On pages 110-111, it shows Technical Bulletin 1, which says it covers 1974-1983 911/T.
"Subject: New Alternator has Integrated Regulator"
"New-type alternator, part number 911 603 120 04 with integrated regulator, is now installed instead of former version, part number 911 603 120 02, which used a separate regulator. Regulator of the new version, part number 911 603 913 01 is located on the back of the alternator and can be replaced separately. Threads on the alternator shaft for installation of pulley have also been changed from M16 x 1 to M17 x 1.5."
It follows with other issues needed for the air duct, resistor, etc.
"Note: These changes were effective with 1982 model year production"
So it sounds complicated enough that everyone can rightfully claim to be right on this one. But I'd believe the Technical Bulletin as definitive. The extra labor in the quote could be accounting for some of the extra modifications that will be needed?
I'd be inclined to try to rebuild the one you have, or to carefully follow the Technical Bulletin instructions. I can email someone photos of the two pages, but I don't think I'm able to post pictures here.
04-03-2015, 03:39 PM
#5
Three Wheelin'
Surely there's a bullet-proof, dead-reliable, super-accurate voltage regulator that can handle the output of these alternators? It seems crazy to purchase old electronic components if fitment isn't a concern.
