Please note this thread has been inactive for 90 days. For the best results, please start a new thread.
Results 1 to 4 of 4
  1. #1
    Cadet
    Join Date
    Jun 2012
    Posts
    21

    Question knock sensor location??

    Hi Guy's I had a issue this weekend when a sensor on starboard side of 2002 5.0 gxi b(f) under the engine rotted off and started to pump water into the bilge when running and did not continue after it was shut down and bilge pump finally caught up. Alarm was going off. I can not locate this in my seloc book. I have to cut the nipple off that broke flush and could not be in a tougher spot. It has a single wire and a brass fitting with a 7/8 heater hose connected to it. I have the sensor out, I think it is a knock sensor and on the way back a short run the temp gauge did not work and the bilge pump had a tough time keeping up with the flow of water,Thankfully I did not have to go far when found.

  2. #2
    Honorary Moderator Emeritus Don S's Avatar
    Join Date
    Aug 2004
    Location
    Western WA.
    Posts
    62,323

    Default Re: knock sensor location??

    As I recall, the knock sensor mounts in a Tee fitting with the hose barb for the water hose, and fits into the block drain hole near the starter.
    Don S.


    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

  3. #3
    Cadet
    Join Date
    Jun 2012
    Posts
    21

    Default Re: knock sensor location??

    Yes Don that is exactly where it is and I thought that was the knock sensor but could find nothing in The Seloc book. Would that make my temp gauge show no temp,as it was working prior to this issue. I was trying to find a part # to get another one. Thanks Again and I feel at ease with your knowledge!

  4. #4
    Honorary Moderator Emeritus Don S's Avatar
    Join Date
    Aug 2004
    Location
    Western WA.
    Posts
    62,323

    Default Re: knock sensor location??

    Just go to your local auto store and get a machined street tee the proper size. Get steel, not brass. With the extra weight of the cooling hose out there, brass can crack to easily where it threads into the block.

    If you can't get a street tee, just use a regular tee and a close nipple. You can use a brass tee, just use a steel nipple that goes into the block.
    Don S.


    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

Similar Threads

  1. Knock Sensor
    By kkalsch in forum Mercruiser I/O & Inboard Engines & Outdrives
    Replies: 0
    Last Post: July 14th, 2012, 09:10 AM
  2. Does anyone know where to get this knock sensor>
    By sam60 in forum OMC I/O & Inboard Engines & Outdrives
    Replies: 2
    Last Post: November 1st, 2011, 09:21 PM
  3. 92 454 Knock Sensor
    By sam60 in forum OMC I/O & Inboard Engines & Outdrives
    Replies: 1
    Last Post: October 28th, 2011, 11:28 PM
  4. knock sensor
    By scoflaw in forum Mercruiser I/O & Inboard Engines & Outdrives
    Replies: 2
    Last Post: June 11th, 2010, 12:05 PM
  5. What is a Knock Sensor?
    By Les MacDougall in forum Yamaha & Suzuki Outboards
    Replies: 4
    Last Post: January 17th, 2009, 02:58 PM
  1. iboats Forum Directory - Over 100,000 forum posts organized by topic