Knock Sensor Install - Teflon Tape?

Roman S

Petty Officer 2nd Class
Joined
Aug 1, 2007
Messages
105
Quick question about the installation of a new knock sensor. Would it be good practice to wrap a bit of teflon tape on the threads before screwing the knock sensor in?
1987 Alpha 1 - 2008 efi 5.7 L S/B.
ON the oppostie side of the engine there is s small brass plug to install. It has tape on it. Wondering if the same for Knock sensor?
Thanks Roman
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: Knock Sensor Install - Teflon Tape?

Would it be good practice to wrap a bit of teflon tape on the threads before screwing the knock sensor in?

It would not be a good practice to use teflon tape on any system in a boat. There are better products. Standard pipe dope with teflon in it is 10000% better than teflon tape.
TT wil also insulate the ground to sensors of any kind.
 

BLinindoll

Seaman
Joined
Sep 16, 2008
Messages
65
Re: Knock Sensor Install - Teflon Tape?

No. There should already be some kind of junk in the threads... usually orange. That's it.
 

Don S

Honorary Moderator Emeritus
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Aug 31, 2004
Messages
62,321
Re: Knock Sensor Install - Teflon Tape?

No. There should already be some kind of junk in the threads... usually orange. That's it.

That is ONLY if it is a genuine OEM Mercruiser part. Aftermarket manufactures miss that step, along with a few other obvious differences in some parts. How else can they make them cheaper.
 

turborich

Petty Officer 2nd Class
Joined
Aug 29, 2008
Messages
132
Re: Knock Sensor Install - Teflon Tape?

A knock sensor just screws into the block to detect engine knock, pre ignition. There should be no need for any thread sealant, besides it needs a good ground.
 

HT32BSX115

Supreme Mariner
Joined
Dec 8, 2005
Messages
10,083
Re: Knock Sensor Install - Teflon Tape?

I seem to remember the service manual indicating specifically to NOT use teflon (or thread sealant) tape on the knock sensor. There's really no reason anyway. You're not sealing anything anyway.
 

chiefalen

Captain
Joined
May 18, 2008
Messages
3,598
Re: Knock Sensor Install - Teflon Tape?

Nothing on the threads.

Was not even going to post when i saw Ht post, cause he got it right, always does.

No anti-seize ether.

Resist the urge to coat every thread with something.
 
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