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CHT sensor snapped off in head
I was changing the old single wire CHT sensor in my 87 3.2 today and it was taking a lot of effort to unscrew it. After approx. 1 1/2 turns it snapped off leaving only the threaded portion of the sensor flush in the head.
I was wondering if anyone else has encountered this and if so what worked and what didn't. I'm thinking about removing the shock and drilling it out, but I'm worried I might damage the head. Thanks, JP |
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05-25-2013, 03:35 PM
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Registered
Join Date: May 2013
Location: ma
Posts: 1,010
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I think i know what part you are talking about See if you can use a small cutting disk on it to cut a line into it and then use a flat head screwdriver to unscrew it.
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05-25-2013, 03:39 PM
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French Import
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Mine came off easy, but only because I have the engine out of course...
 Some people reported seized CHT and of course there is limited room to work on them in situ. Since yours was turning you are better off than most but sill proceed with caution. Try drilling a small hole and use an easy out if you can find the room.
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Gilles & Kathy Happiness is not having a Porsche in the garage... Happiness is having a Porsche on the road!  86 Porsche 911 Cabriolet, 2011 BMW 1200RT, 03 Saab 93 Cabriolet, 06 MB E350 Estate |
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05-25-2013, 05:25 PM
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6 cylinder symphony
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Hit it with liquid wrench/pbblaster while you formulate your plan.
I would try to drill it and then use an e-z out. Suckage. Regardless, sounds like no fun. I'm so glad that when I replaced mine it came out easy.
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'84 3.2 Targa '89 964 Coupe "What do you mean NEXT project?" - my wife |
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05-25-2013, 05:38 PM
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Registered User
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Yeah, I think I'm going to remove the left rear shock and try an EZ out. Thanks.
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05-25-2013, 05:54 PM
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On Tour
Join Date: Apr 2010
Location: New Mexico
Posts: 1,505
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+1 on the PB Blaster soak.... That's what I did before removing mine. Sure can't hurt.
Good luck, that's a tough situation.
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- 2018 Cayenne S 958.2 - 1988 Carrera 3.2 Coupe Marine Blue (SOLD) |
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05-25-2013, 08:27 PM
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Registered User
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Update - the EZ out method wasn't working out, I felt like the EZ out was going to snap, too. I just drilled the sensor from the center 1 bit size up over and over again until the paper thin slivers of what was left of the sensor came out. The sensor is hollow inside so there is a centered hole to start drilling from and it was very easy to keep it centered as long as you don't try to go too big too fast. I managed to save the threads and didn't even need to tap them afterwards (good thing because I do not have a 12mmx1.00 tap!). Only extra parts removed were the LR shock and heater blower.
Thanks for the suggestions and I hope my situation and resolution will help someone else someday. |
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06-06-2013, 02:28 PM
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On Tour
Join Date: Apr 2010
Location: New Mexico
Posts: 1,505
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Fantastic! Glad you got it out without further issue.. Now you can get back on the road.
Regards
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- 2018 Cayenne S 958.2 - 1988 Carrera 3.2 Coupe Marine Blue (SOLD) |
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06-06-2013, 06:33 PM
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Car with no name
Hester
