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Alternater change

butch199
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butch199 Member

butch199

Posted
Posted

Alternator died on my 99 996 c2. I replaced it this weekend, thanks to info posted on this forum it was easy job. As an FYI I want to let everyone know that their are 2 hard plastic vacuum lines running over top of the alternator (not sure what they are for). Be careful they are brittle and break very easy(don't ask how I know) and are a real pain to replace because of minimal clearance on top of engine.

Thanks to all contributors on the forum.

1999Porsche911 Member

1999Porsche911

Posted
Posted (edited)
Alternator died on my 99 996 c2. I replaced it this weekend, thanks to info posted on this forum it was easy job. As an FYI I want to let everyone know that their are 2 hard plastic vacuum lines running over top of the alternator (not sure what they are for). Be careful they are brittle and break very easy(don't ask how I know) and are a real pain to replace because of minimal clearance on top of engine.

Thanks to all contributors on the forum.

Those 2 lines are to control the resonance flap on the back crossover intake tube. They start at the electric changeover valve (behind alternator) and one goes to the vacuum reserve canister and the other to the flap.

Edited by 1999Porsche911
butch199 Member

butch199

Posted
  • Author
Posted
Alternator died on my 99 996 c2. I replaced it this weekend, thanks to info posted on this forum it was easy job. As an FYI I want to let everyone know that their are 2 hard plastic vacuum lines running over top of the alternator (not sure what they are for). Be careful they are brittle and break very easy(don't ask how I know) and are a real pain to replace because of minimal clearance on top of engine.

Thanks to all contributors on the forum.

Those 2 lines are to control the resonance flap on the back crossover intake tube. They start at the electric changeover valve (behind alternator) and one goes to the vacuum reserve canister and the other to the flap.

Thanks for info--what does the resonance flap due?

  • 2 weeks later...
TimR Member

TimR

Posted
Posted
Alternator died on my 99 996 c2. I replaced it this weekend, thanks to info posted on this forum it was easy job. As an FYI I want to let everyone know that their are 2 hard plastic vacuum lines running over top of the alternator (not sure what they are for). Be careful they are brittle and break very easy(don't ask how I know) and are a real pain to replace because of minimal clearance on top of engine.

Thanks to all contributors on the forum.

Any advice you can give me on removing the alternator in my Boxster. I have the two bolts removed that attached the alternator to the engine, but the alternator won't budge. It looks like it needs to be rotated clockwise a little before it will slide out, but I can not get it to rotate.

Where there instructions listed on how to remove the alternator, because I could not find any?

Thanks.

butch199 Member

butch199

Posted
  • Author
Posted
Alternator died on my 99 996 c2. I replaced it this weekend, thanks to info posted on this forum it was easy job. As an FYI I want to let everyone know that their are 2 hard plastic vacuum lines running over top of the alternator (not sure what they are for). Be careful they are brittle and break very easy(don't ask how I know) and are a real pain to replace because of minimal clearance on top of engine.

Thanks to all contributors on the forum.

Any advice you can give me on removing the alternator in my Boxster. I have the two bolts removed that attached the alternator to the engine, but the alternator won't budge. It looks like it needs to be rotated clockwise a little before it will slide out, but I can not get it to rotate.

Where there instructions listed on how to remove the alternator, because I could not find any?

Thanks.

Loosen the bolt that runs thru the pully(the bolt on right as you look at it) a few turns, then tap with a hammer to push the bushing out in the back of the alternater a few mm. You should spray some wd40 on the bushing too. This frees up the alternator to be turned clockwise and removed easily. ZThis is the method described in shop manuel--it worked for me.

Good luck.

  • 5 weeks later...
pajamaguy28 Member

pajamaguy28

Posted
Posted

what was the deciding sign that the alternator needed to be replaced? how many miles did you have at the time? any source for your instructions for replacement? thanks. i will be doing that in the next few days here

butch199 Member

butch199

Posted
  • Author
Posted
what was the deciding sign that the alternator needed to be replaced? how many miles did you have at the time? any source for your instructions for replacement? thanks. i will be doing that in the next few days here

Battery went dead and I noticced the guage sometimes showed only 12 volts when running at 2000rpm. I tested with my battery charger-it has a test function to test the alternator. It showed a fault. My car is 99 996 with about 50000 when alternator went bad. Idid search on the sight and foound DIY, really was an easy projecy- good luck

CosmosC4S Member

CosmosC4S

Posted
Posted

My car is in the shop right this moment for a new alternator,

I was quoted $320 for a rebuilt Bosch alternator (includes next day shipping) and 3hrs labor ($275)

Picking it up end of tomorrow.

butch199 Member

butch199

Posted
  • Author
Posted
My car is in the shop right this moment for a new alternator,

I was quoted $320 for a rebuilt Bosch alternator (includes next day shipping) and 3hrs labor ($275)

Picking it up end of tomorrow.

I bought rebuilt alternator from Pelican Parts for around $300., put it in myself took a little over 1 hour --easy DIY

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