Knock sensor replacement questions
Thread Starter
Burning Brakes
Joined: Jul 2004
Posts: 1,164
Likes: 71
From: MA
Knock sensor replacement questions
I will soon begin replacing my knock sensors and have a few questions for those that have replaced theirs. I have the service manual and the TSB regarding building a dam of RTV around the sensor.
1. I have a new wiring harness that includes the rubber plugs that seal the sensors to the valley cover. The manual doesn't mention anything about adding a coating of RTV to the rubber plugs to insure a good seal. Is this a good idea?
2. The TSB mentions building a RTV dam around the rear knock sensor rubber plug only. It recommends not making a complete circle of RTV around the plug. It says to leave ~20* arc off at the rear of the dam. It also doesn't mention anything about building a dam of RTV around the front knock sensor rubber plug. I have have seen pictures on the forum showing 360* RTV dams around the front and rear knock sensor rubber plugs. What would you recommend? The partial dam on just the rear as the TSB recommends or the complete 360* dams on both front and rear sensors?
1. I have a new wiring harness that includes the rubber plugs that seal the sensors to the valley cover. The manual doesn't mention anything about adding a coating of RTV to the rubber plugs to insure a good seal. Is this a good idea?
2. The TSB mentions building a RTV dam around the rear knock sensor rubber plug only. It recommends not making a complete circle of RTV around the plug. It says to leave ~20* arc off at the rear of the dam. It also doesn't mention anything about building a dam of RTV around the front knock sensor rubber plug. I have have seen pictures on the forum showing 360* RTV dams around the front and rear knock sensor rubber plugs. What would you recommend? The partial dam on just the rear as the TSB recommends or the complete 360* dams on both front and rear sensors?
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
I will soon begin replacing my knock sensors and have a few questions for those that have replaced theirs. I have the service manual and the TSB regarding building a dam of RTV around the sensor.
1. I have a new wiring harness that includes the rubber plugs that seal the sensors to the valley cover. The manual doesn't mention anything about adding a coating of RTV to the rubber plugs to insure a good seal. Is this a good idea?
2. The TSB mentions building a RTV dam around the rear knock sensor rubber plug only. It recommends not making a complete circle of RTV around the plug. It says to leave ~20* arc off at the rear of the dam. It also doesn't mention anything about building a dam of RTV around the front knock sensor rubber plug. I have have seen pictures on the forum showing 360* RTV dams around the front and rear knock sensor rubber plugs. What would you recommend? The partial dam on just the rear as the TSB recommends or the complete 360* dams on both front and rear sensors?
1. I have a new wiring harness that includes the rubber plugs that seal the sensors to the valley cover. The manual doesn't mention anything about adding a coating of RTV to the rubber plugs to insure a good seal. Is this a good idea?
2. The TSB mentions building a RTV dam around the rear knock sensor rubber plug only. It recommends not making a complete circle of RTV around the plug. It says to leave ~20* arc off at the rear of the dam. It also doesn't mention anything about building a dam of RTV around the front knock sensor rubber plug. I have have seen pictures on the forum showing 360* RTV dams around the front and rear knock sensor rubber plugs. What would you recommend? The partial dam on just the rear as the TSB recommends or the complete 360* dams on both front and rear sensors?
Once the plug is sealed with RTV, it will keep water and moisture out.
BC
