Crankshaft Position Sensor Question - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-29-2005, 11:32 AM   #1
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Hi all, I just purchased my first Bonneville for $330 at a police auction and I love it! I had no idea that Bonnevilles were so popular as evidenced by this forum etc... It sounds like these cars are pretty awesome, my dad is currently driving a 3.8 with over 240,000 on it and his previous 3.8 had over 340,000 miles on it! My car is a 92 SE and has 174,000 on it. I had put about 500 miles on it when it died on me while driving it, the car would crank and eventually started. I drove the car another 150 miles and it did the same thing this time it would turn over but wouldn't start. Both times it died it threw a "service engine soon" light. Through searching these forums I suspected that it was the crankcase sensor. This morning I went out and ran the code retrieval (BTW thats an excellent tutorial in the TechInfo section) and it showed a code 18, which is a cam/crank error as I suspected. Now down to my question (sorry about the long post), according to Chilton when reinstalling the crankshaft bolt I "torque it down to 110 ft. lbs, plus an additional 76 degree rotation". I am not quite sure what they are talking about with the additional 76 degree rotation and how would you measure it? Is it critical that you get exactly a 76 degree rotation? Thanks all for your help in advance.
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Old 09-29-2005, 11:41 AM   #2
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Close is good enough on the extra degrees.

Think about a right angle..90 degrees and a V is about 45 degrees... so somewhere up the middle between L and V is 76 degrees.
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Old 09-29-2005, 11:49 AM   #3
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Thanks Bill, I was figuring about the same. I just wasn't sure how critical it was and wanted to bounce it off someone that has replaced a few.
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Old 09-29-2005, 11:51 AM   #4
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Working with a dealership mechanic for years taught me a couple things..

It'* pretty infrequently they actually use a torque wrench because their arms are calibrated or it'll slow them down and flat rate doesn't pay slow people well.

You'll be close and that'll be right on the money as far as the engineering of it goes.
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Old 09-29-2005, 12:14 PM   #5
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I am going to go out and pull the access cover and check the wiring harness (sounds as if its pretty common for them to go bad) to the sensor. If the wiring is good I will replace the sensor and give you guys an update when I am done. Thanks again for all your help.
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