Before I crawl under the thing again..
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Freshman User
Joined: Nov 2003
Posts: 38
Likes: 0
From: Beaverton OR
Before I crawl under the thing again..
This forum seems to be a bit more technically oriented so heres a crank question. In the case of a bad bearing, or the knock as a result of a bad bearing, would the knock be present at all rpm's?
I'm getting a chattering/knocking at around 2500 rpm's and have ruled out i believe pinging and timing issues. i'm familiar with the sound of pinging from timing and bad gas ect.... and this seems to be located in one area. I was thinking maybe the arm on the fuel pump maybe, or possibly something around the area of the oil filter. with the history of this engine, wich is completely stock, all the ingredients that would cause a bearing to go have been present. but if my memory serves me right, i seem to remember the knocking from a bad bearing being pretty obvious and knocking at any speed. Thanks in advance if anyone has any insight. With the exception of this one noise thats driving me crazy, the motor is dialed in about as good as an old stock motor can be.
Thanks
I'm getting a chattering/knocking at around 2500 rpm's and have ruled out i believe pinging and timing issues. i'm familiar with the sound of pinging from timing and bad gas ect.... and this seems to be located in one area. I was thinking maybe the arm on the fuel pump maybe, or possibly something around the area of the oil filter. with the history of this engine, wich is completely stock, all the ingredients that would cause a bearing to go have been present. but if my memory serves me right, i seem to remember the knocking from a bad bearing being pretty obvious and knocking at any speed. Thanks in advance if anyone has any insight. With the exception of this one noise thats driving me crazy, the motor is dialed in about as good as an old stock motor can be.
Thanks
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
It could be an exhaust leak, I've had 'em where it'd only make the noise at a certain rpm.
Check the simplest stuff first. Like the fuel pump as was already said.
Does it only do it under load or all the time?
Check the simplest stuff first. Like the fuel pump as was already said.
Does it only do it under load or all the time?
Postmaster
Joined: Jan 2003
Posts: 3,775
Likes: 2
From: Conway Arkansas
Check for exhaust leaks.
I messed with a freakin exhaust leak for 2 months before I found it
It was making a weird sound and stuff, and I finally found it
#8 header bolts only had 1 in instead of 2... causing it to leak at a higher RPM
I messed with a freakin exhaust leak for 2 months before I found it
It was making a weird sound and stuff, and I finally found it
#8 header bolts only had 1 in instead of 2... causing it to leak at a higher RPM
Posting Guru
Joined: Nov 2003
Posts: 1,888
Likes: 1
From: Iowa
when my 390 was knocking BAD, i could tell it was coming from the top end in the head on the drivers side and when i recently pulled it apart i had founf the #7 intale valve seet had came out and was sitting there rattling around the valve, but this was a ver exsesive knock loud, but i dought thats whats wrong with yours and i dontt hink valve seets fall out very ofton either. good luck
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Freshman User
Joined: Nov 2003
Posts: 38
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From: Beaverton OR
Well I managed to listen to the noise coming from the pan while I had the thing up on a lift while it was idling. so I believe it's confirmed.......Now Do I just replace the bad one and not disturb the rest or is it better to just do them all while I have the pan off.
I don't want to get too fancy. The parts and labor I've put into it are already more than the truck is worth. this problem will not get better just worse if i don't get to it soon though. the parts are cheap enough. Is it recomended that All the bearings get done?
I know there are some close tolerances , I don't want to open up a can of worms.
I don't want to get too fancy. The parts and labor I've put into it are already more than the truck is worth. this problem will not get better just worse if i don't get to it soon though. the parts are cheap enough. Is it recomended that All the bearings get done?
I know there are some close tolerances , I don't want to open up a can of worms.
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