Knock Sensor Replace??
Thread Starter
Burning Brakes
Joined: Aug 2004
Posts: 771
Likes: 0
From: Washington District of Columbia
Knock Sensor Replace??
After draining the coolant thru the knock sensor holes, is it necessary to
use a SEALANT of some sort on the sensors when re-inserting them
back into position? Thanks
use a SEALANT of some sort on the sensors when re-inserting them
back into position? Thanks
Safety Car
Joined: May 2007
Posts: 3,651
Likes: 10
From: Apple Valley MN
I've pulled my knock sensors twice and reinstalled them without adding any sealant, and have had no leaks. If you're installing new sensors and they don't have any sealant, then by all means you will need to apply some to the threads.
Pro
Joined: Feb 2009
Posts: 600
Likes: 1
From: Woodbridge Virginia
Curiosity question only. What is the advantage for one to drain the coolant through the knock sensor? Looking at your profile shows you have a LT1. Is it also a good thing to do the same to a LT4 and if so what other year 'vettes would this be applicable too? Thank you in advance.
BTW I agree with the not applying anything to the threads of the knock sensor for the various sstated reasons.
Olcrusty
BTW I agree with the not applying anything to the threads of the knock sensor for the various sstated reasons.
Olcrusty
Thread Starter
Burning Brakes
Joined: Aug 2004
Posts: 771
Likes: 0
From: Washington District of Columbia
Curiosity question only. What is the advantage for one to drain the coolant through the knock sensor? Looking at your profile shows you have a LT1. Is it also a good thing to do the same to a LT4 and if so what other year 'vettes would this be applicable too? Thank you in advance.
BTW I agree with the not applying anything to the threads of the knock sensor for the various sstated reasons.
Olcrusty
BTW I agree with the not applying anything to the threads of the knock sensor for the various sstated reasons.
Olcrusty
completely drain the block. Otherwise, quite a bit remains in the system.
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 66
From: Queensland, AUSTRALIA
Ive never bothered putting anything on the threads, and ive never had one leak either. Make sure you do them up to the right torque as specified in the genuine GM service manual.
100% correct. That is exactly why. When you dont remove them, the block will stay completely full, and the most youll ever get out will be the amount that will flow from the lowest hose you remove. The hoses are not that low. The knock sensors are at the lowest point of the cooling system ( as far as the engine side of it is concerned )
If this is an LT1, draining the radiator will do just that and nothing else. The main inlet and outlet on the LT1 water pump are abit higher than both the pump and the block, so at best, you will get a bit out of the heads, but again not all of it.
Water wont flow up hill, and neither will coolant.
If this is an LT1, draining the radiator will do just that and nothing else. The main inlet and outlet on the LT1 water pump are abit higher than both the pump and the block, so at best, you will get a bit out of the heads, but again not all of it.
Water wont flow up hill, and neither will coolant.
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
It is a 1/4 NPT (pipe thread).
Without some type of thread sealant, you are taking a chance on it leaking. If I reuse a sensor, I clean off the residual red sealant applied by GM, and re-apply a very thin coat of liquid teflon.
Without some type of thread sealant, you are taking a chance on it leaking. If I reuse a sensor, I clean off the residual red sealant applied by GM, and re-apply a very thin coat of liquid teflon.
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Drifting
Joined: Nov 2005
Posts: 1,324
Likes: 5
From: Charlotte NC
Curiosity question only. What is the advantage for one to drain the coolant through the knock sensor? Looking at your profile shows you have a LT1. Is it also a good thing to do the same to a LT4 and if so what other year 'vettes would this be applicable too? Thank you in advance.
BTW I agree with the not applying anything to the threads of the knock sensor for the various sstated reasons.
Olcrusty
BTW I agree with the not applying anything to the threads of the knock sensor for the various sstated reasons.
Olcrusty
Melting Slicks
Joined: Aug 2008
Posts: 2,082
Likes: 50
From: Palmdale CA
Can we purchase this from a parts house/GM?
