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Cylinder 3. What is sensor and how do I get it out?
After sitting on the engine stand for the last year it is time for the rebuild to begin. Having some trouble removing tthe sensor located on the forward side of cylinder 3. I cannot get a wrench on it and it looks like it is meant to be taken out with a socket due to the cutouts in the cooling fins. The wire does not seem like it has an electrical connection fitting allowing it to slide off the end and I don't want to pull to hard. On the other end of the wire it looks like it has been cut at some point in time and then rejoined and heat taped. Is this the correct method?
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07-22-2015, 09:18 PM
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07-22-2015, 09:19 PM
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It's the CHT (cylinder head temperature) sensor. Not sure but there might be a special socket similar to a spark-plug socket that you put on it and then use an open box wrench on that. Or see here for a home-brew: CHT Sensor Replacement
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430 I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!! How about a NoBadDays DualChip for 964 or '95 993 Last edited by ischmitz; 07-22-2015 at 09:59 PM.. |
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07-22-2015, 09:56 PM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,445
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We use a deep 14mm 3/8" impact socket which has a long slot cut in the side with a cutoff disc to clear the wire. The early ones are 13mm. A non-impact socket is too flexy when cut. Don't over tighten when you reinstall it or it can shear off in the head.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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07-23-2015, 04:14 AM
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Registered
Join Date: Mar 2002
Posts: 46
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I just did that on my 86, I took an old snap-on 14mm and had a friend cut a long slot in it with a lathe. Worked great.
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07-23-2015, 04:53 AM
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Thanks guys for the help - appreciate the links too! Lots more questions coming soon I am sure.
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07-23-2015, 06:25 AM
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Schleprock
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,639
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I used a flare nut wrench
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Kevin L '86 Carrera "Larry" |
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07-23-2015, 09:55 AM
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Registered
Join Date: Oct 2008
Location: Denver, CO
Posts: 3,494
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looks like yours is the newer 2 wire version. When my one wire version went bad, I simply cut the wire, used a "standard" socket and replaced with the updated 2 wire version.
You might want to do a cost/benefit comparison between modding the socket and simply replacing the sensor? |
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07-23-2015, 10:18 AM
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1974 Porsche 911 Targa 3.6
