C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

random knock sensor question

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Old Nov 8, 2015 | 11:28 AM
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Default random knock sensor question

anybody know if the thread size on the knock sensor is the same on all years?

like would my 85 ks threads be the same threads as my 87 ks threads and same as a all other years?

i know there are more ks's in different places, im just talking about the threads.

thnx.
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Old Nov 8, 2015 | 12:04 PM
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Threads are all the same. It's 3/8" NPT, IIRC.
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Old Nov 8, 2015 | 11:55 PM
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Same size it's been since 1955.
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Old Nov 10, 2015 | 05:26 PM
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Originally Posted by Cliff Harris
Same size it's been since 1955.

turns out it is 1/4. pipe thread.
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Old Nov 10, 2015 | 06:25 PM
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1/4 - 18
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Old Nov 10, 2015 | 06:46 PM
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They just used the block drain on that side of the block. Too much tape/sealer can effect the sensor from what I've herd.
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Old Nov 10, 2015 | 07:03 PM
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Originally Posted by VikingTrad3r
turns out it is 1/4. pipe thread.
Oops. SORRY! I actually typed 1/4...then second guessed myself!
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Old Nov 10, 2015 | 08:09 PM
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Originally Posted by BOOT77
They just used the block drain on that side of the block. Too much tape/sealer can effect the sensor from what I've herd.
have to use the right dope and torque no tape!!!!!!!
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Old Nov 10, 2015 | 10:20 PM
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this was my first try at a block drain system for flushing. worked good. ive improved it and will post better puctures.

im in the process of a three day douche for the 85.

it was disgusting the previous owner hacked the wiring to the fans. My guess is because it was overheating because the doorknob did not do regular coolant maintenance.



Originally Posted by antfarmer2
have to use the right dope and torque no tape!!!!!!!



Last edited by VikingTrad3r; Nov 10, 2015 at 10:22 PM.
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Old Nov 11, 2015 | 12:55 AM
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I took my new knock sensor to Lowe's and put together a block flush adapter:

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Old Nov 11, 2015 | 08:05 AM
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that does not look like the right dope and most likely the wrong torque because of it. I put new in could not bring myself to put in old parts. the new one came with the right dope.

Last edited by antfarmer2; Nov 11, 2015 at 08:11 AM.
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Old Nov 11, 2015 | 08:08 AM
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Originally Posted by Cliff Harris
I took my new knock sensor to Lowe's and put together a block flush adapter:

I like that!
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Old Nov 11, 2015 | 08:13 AM
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There's actually 1/4 NPT to garden hose adapters available in the market place. Not maybe an easy "local find" but they are out there.

A friend uses a short section of old compressor hose to get the fittings he uses outside of the tight confines of the engine/frame rail components in his car. Not a C4. I'd think configuring a short length of compressor hose would certainly make the effort less aggravating.

Last edited by WVZR-1; Nov 11, 2015 at 08:18 AM.
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