help please
Thread Starter
1st Gear
Joined: Nov 2012
Posts: 1
Likes: 0
help please
I have an 87 conv 117,000 and i developed a knock sound like a rod or bearing but at idle i will get maybe 10 light knocks a minute inconsistance louder ones to 3000 rpm and after 3000 it goes away i checked torque converter bolts they r tight sound is coming from drivers rear of engine but really cant pinpoint it i have a little knowledge but with the intermittingg and the disappear after3000 rpms im baffled and hope its not the lower end any ideas should i take out converter bolts and slide it back and start it up and see if noise is gone or any other ideas
Safety Car
Joined: Apr 2011
Posts: 3,660
Likes: 22
If you put a wrench on the TC bolts and those are tight, (my first thought) I'd see if there is anything in the pan. Drain the oil into a clean pan and filter some thru a clean paint filter or similar fabric to see if there are any signs of bearing material...silvery liquid stuff floating in the oil. I wouldn't panic just yet...Mine will do something similar...goes away for weeks at a time then suddenly for no reason the knocking/bumping at idle comes back. Mine is only idle and inconsistant.
I wonder if crank end run-out may be the source? Crank shaft floating back and forth in the bearings just enough for something to rub internally as it rotates? Beyond that wild *** guess, I've got nothing !
If you can, oil analysis will prove one way or another what is going on internally.
I wonder if crank end run-out may be the source? Crank shaft floating back and forth in the bearings just enough for something to rub internally as it rotates? Beyond that wild *** guess, I've got nothing !
If you can, oil analysis will prove one way or another what is going on internally.
Le Mans Master
Joined: May 2006
Posts: 9,226
Likes: 9
From: Irvine Ca
One easy fix for me....the air pump/smog pump was going out....I know that sounds funny, but it made a knocking sound and for some reason the sound didn't seem to be coming from there.....
Take a long screw driver or any metal rod, place one end on 'any' point of the motor and then put your ear on the other end. Use the other end to actually close your ear canal from outside sound.
Keep moving the rod around, you'll soon find out exactly where the sound is originating from. At least you'll know where to start.
Take a long screw driver or any metal rod, place one end on 'any' point of the motor and then put your ear on the other end. Use the other end to actually close your ear canal from outside sound.
Keep moving the rod around, you'll soon find out exactly where the sound is originating from. At least you'll know where to start.
Slingshot
Joined: Dec 2001
Posts: 3,817
Likes: 24
From: Charlotte NC
One easy fix for me....the air pump/smog pump was going out....I know that sounds funny, but it made a knocking sound and for some reason the sound didn't seem to be coming from there.....
Take a long screw driver or any metal rod, place one end on 'any' point of the motor and then put your ear on the other end. Use the other end to actually close your ear canal from outside sound.
Keep moving the rod around, you'll soon find out exactly where the sound is originating from. At least you'll know where to start.
Take a long screw driver or any metal rod, place one end on 'any' point of the motor and then put your ear on the other end. Use the other end to actually close your ear canal from outside sound.
Keep moving the rod around, you'll soon find out exactly where the sound is originating from. At least you'll know where to start.
But, try a mechanic's stethoscope. They are under $4. Check it out:http://www.harborfreight.com/mechani...ope-41966.html
