Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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tr7v8mike
Michael Booth
Sydney, Australia
(18 posts)

Registered:
02/22/2015 10:26PM

Main British Car:
1981 TR7 Rover 4.6

Knock sensor
Posted by: tr7v8mike
Date: January 12, 2021 05:45PM

Hi,
I'm looking to fit a knockSenseMS knock sensor to my S2 4.0L engine but I'm struggling to find a good spot. Can anyone suggest an appropriate location or, failing that, a spot I can drill and tap (safely)?

Thanks

Michael


turbodave
dave cox

(60 posts)

Registered:
04/30/2018 03:00PM

Main British Car:


Re: Knock sensor
Posted by: turbodave
Date: January 13, 2021 12:35PM

The factory knock sensors were on a boss adjacent to the center core-plug on each side of the block - surely that's a good stating point? If you don't have a boss, then you'll need to get creative.


tr7v8mike
Michael Booth
Sydney, Australia
(18 posts)

Registered:
02/22/2015 10:26PM

Main British Car:
1981 TR7 Rover 4.6

Re: Knock sensor
Posted by: tr7v8mike
Date: January 14, 2021 02:57AM

Hi Dave,
I found the holes but they are quite a bit bigger than the aperture in the sensor I have.
I guess my options are
1) epoxy a bolt into the hole, grind it off flush, then drill and tap it.
2) Bolt a block of aluminium to the hole with the bolt head recessed then bolt the sensor to the block
3) Grind off the lip on the sump pan and fix the sensor with one of the sump pan screws
4) Can I just epoxy the sensor on? or is that just way too lazy


turbodave
dave cox

(60 posts)

Registered:
04/30/2018 03:00PM

Main British Car:


Re: Knock sensor
Posted by: turbodave
Date: January 14, 2021 09:16PM

By virtue of what the knock sensor is, and how it functions, mounting it in epoxy, or the bolt that it attaches to, mounted in epoxy, is by far NOT what you want to do.
Personally, I'd machine an insert to thread into the hole, and accept the sensor, or another option is to drill out to 3/8" NPT (or whatever size works), wind in an aluminum taper plug with red Loctite, and then drill-tap that to accept the sensor, The taper thread will definitely hold well and fully transfer the micro vibrations.


waterbucket
Philip Waterman
England
(99 posts)

Registered:
07/30/2011 01:08PM

Main British Car:
1972 MGB GT

Re: Knock sensor
Posted by: waterbucket
Date: January 18, 2021 03:44PM

Have you tried looking for a knock sensor with a bigger hole? I have two Jaguar AJV6 engines one is a 2001 and I think they have a 12mm hole the later engine has smaller holes from memory 8mm. Both sensors are made by Bosch and I am told they are equally effective.


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