Knocking traced to exhaust on frame!!!
Thread Starter
TECH Apprentice
Joined: Jan 2023
Posts: 340
Likes: 47
From: Corpus Christi, TX
Knocking traced to exhaust on frame!!! Well I must admit that I have been fooled. After having the initial cam failure and be terrified to dump money into the vehicle which I also did not have at the time I decided to buy a used cheap same cam to also avoid retuning. Mechanically after repairing it seemed ok but shortly after driving a new knocking sound which led to this post and the findings that the trays I received with my flat non DOD valley cover weren't non DOD trays and causing that gouge which I assumed was the noise. The trays showed up and I said nothing because the sound persisted.
I spent yesterday swapping in 7100ch's because I thought then it was Rod Knock to find my crank in perfect new condition.
I must add that getting the vehicle to knock consistently was difficult and a huge factor in why I tore the upper and lower engine apart. People mention alot of tools to use as a stethoscope but the magnet on an antenna tube to retrieve dropped iron is the best. Mine has a polished half circle dome cap that is soft on the ear and it is just precise in the sound in the way it attaches to bolts. I had tried used a copper pipe and a rod on a cup. I almost thought it was the tranny rebuild I just did but the transmission was silent. I finally get the truck making the sound real well and It ended up being the mid exhaust tapping on the frame!!!
Im so happy that my engine is ok I went crazy looking for this knocking sound.
And no hard feelings Karen I still love you.
I spent yesterday swapping in 7100ch's because I thought then it was Rod Knock to find my crank in perfect new condition.
I must add that getting the vehicle to knock consistently was difficult and a huge factor in why I tore the upper and lower engine apart. People mention alot of tools to use as a stethoscope but the magnet on an antenna tube to retrieve dropped iron is the best. Mine has a polished half circle dome cap that is soft on the ear and it is just precise in the sound in the way it attaches to bolts. I had tried used a copper pipe and a rod on a cup. I almost thought it was the tranny rebuild I just did but the transmission was silent. I finally get the truck making the sound real well and It ended up being the mid exhaust tapping on the frame!!!
Im so happy that my engine is ok I went crazy looking for this knocking sound.
And no hard feelings Karen I still love you.
Last edited by Guy with a Chevy; Aug 14, 2023 at 09:40 PM.
