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Senior Member
Join Date: Mar 2001
Location: Calgary, Alberta, Canada
Posts: 424
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Battery boiling
1988 Carrera. When I go for a lon highway drive. It almost appears like the battery is bein overcharged and starts boiling.
Does anyone have some diagnosis. Battery works fine. Has enough CCA to turn the engine over - and starts fine.
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Targa 88 www.pelicanparts.com/gallery/targa88 There is speed.... and then there is VELOCITY |
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10-07-2006, 03:18 PM
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Voltage regulator.
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"It gets a little bit louder above 5,000 RPM so you can't hear the passenger scream" Porsche 911 Turbo |
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10-07-2006, 03:29 PM
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Registered
Join Date: Oct 2004
Location: Dayton, Ohio
Posts: 765
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Ditto on what dozer said. get it out of there before it frys your electrical system. while you are at it just replace the alternator too.
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Bill 87 911 Targa 06 Toyota Sequoia |
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10-07-2006, 03:54 PM
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,268
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Yep, bad VR. I was able to purchase one locally for ~$25 IIRC. I suspect you could get the parts that you need from Pelican P. It's technically "internal" but it's really just bolted to the back of the alt. I recommend everyone with a 911 get a Voltmeter. I suspect my car was overcharging for months. Fortunately no damage was done. (the 911 is built like a tank) You can either change the VR, front bearing, and brushes yourself for $30-40 and an afternoon, or get the alt rebuilt by someone and that'll probably cost $75-100. I think getting a rebuilt alt is a couple hundred bucks.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa  SOLD 2004 - gone but not forgotten
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10-07-2006, 05:47 PM
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Registered
Join Date: Nov 2005
Location: CA
Posts: 7,286
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Obviously it's the VR as every said. When I had my problem, someone even said if a battery cell is dried, the symptom is the same. So there is a possibility there. You can check both, the battery and VR.
I took the alternator out myself and let the pro do the rebuild. Cost me a little over $150.
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Fat butt 911, 1987 |
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10-08-2006, 05:13 PM
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Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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What does your voltmeter say at the battery terminals with the engine running?
Joe |
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10-09-2006, 08:15 AM
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Registered
Join Date: Aug 2002
Location: Galivants Ferry, SC
Posts: 10,550
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Boiling battery is clear sign of over-voltage...bad voltage regulator.
This Tech article might be of some help for the cars with internal VR's--->http://www.pelicanparts.com/techarticles/911_volt_reg_replace/911_volt_reg_replace.htm - Wil
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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10-10-2006, 05:54 AM
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1978 Porsche 911 dp-Motorsport 3.3 Turbo
