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Gas\Diesel Engine & Transmission:

Need some opinions



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Old 03-15-2005, 08:25 PM   #1
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Need some opinions

A few weeks ago my 454 started knocking after me and cody did some wheeling. It doesnt do it when it's cold, but gets louder when it warms up. It gets pretty quiet when under load, but is very noticeable when coasting. It still runs ok, just knocks.

I pulled the valve covers and everything looks good there. I also tried adjusting the valves, but it didnt help anything.

I havent done a compression check yet, my tester is back home. Do stuck rings typically show up on a comp. test?

My only other guess would be a loose rod bearing.

Anyone have any other ideas? I wish I could just completely rebuild it, butI need to get this thing up and running again so I'll have something to tow my junk with in a couple months. Unless someone has about 3 grand they want to part with.
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Old 03-15-2005, 09:50 PM   #2
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#4 Main bearing,
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If you need a ladder to work on your rig you might want to re-think your suspension.
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thats the look a 14yo boy has the 1st time he sees his 1st set of boobies . its the simple pleasures in life
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Old 03-15-2005, 10:06 PM   #3
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Is that a common problem?
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Old 03-15-2005, 10:08 PM   #4
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no... but it sounds very familiar to what I had once in my old dually

and a main will knock when the motor goes back to idle, what kinda oil pressure do you have at idle?
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If you need a ladder to work on your rig you might want to re-think your suspension.
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thats the look a 14yo boy has the 1st time he sees his 1st set of boobies . its the simple pleasures in life
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Old 03-15-2005, 10:22 PM   #5
 
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Change the oil and look for metal, might have knocked the skirt off a piston? Also might check to see that the harmonic ballancer hasent come apart?

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Old 03-15-2005, 10:23 PM   #6
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Is that a common problem?
might be mine started is doing the same thing, i did do a comp test they were all low 120 ??? sounds like a rattle ?



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Old 03-15-2005, 10:35 PM   #7
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low compression won't make it knock...

Wrist pin will knock - Pull off a plug wire and the wrist pin knock will go away

Main knock.. low oil pressure will make a loose main knock

Rod knock.. will do it all the tme

Cracked flywheel ... will sound like a rod knocking

plus what Catfish said above
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If you need a ladder to work on your rig you might want to re-think your suspension.
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thats the look a 14yo boy has the 1st time he sees his 1st set of boobies . its the simple pleasures in life
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Old 03-15-2005, 10:41 PM   #8
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Yes, like a rattle. I did change the oil, didnt notice anything. Oil pressure is good. Balancer also looks good.

I'm gonna pull the oil pan off next. I was just wanting to see if anyone knew of any similar or "common problems" with the BBCs.
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Thats pretty much how I feel about it....You gone yet?
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Old 03-16-2005, 11:02 AM   #9
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I donno...when my BBC went south, it did it all at once....
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Old 03-18-2006, 01:21 PM   #10
 
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sdutch69 just gettin started
my sb 350 doing same thing

my chevy 350 is doing the same thing yours is when i first start it it sounds fine after it warms up 5 mins or so it starts knocking down by oil pan.runs ok no oil pressure loss or power loss just starts knockin when cominig to red lights or at idle and fades away as im driving.havent as of yet to figure out problem pullin oil pan of today to inspect it any suggestions would be helpful
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Old 03-19-2006, 01:14 PM   #11
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hmm

Are the lifters maybe not holding up after it warms up? Maybe some trash or gunk got into one or more of them.
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Old 03-19-2006, 02:31 PM   #12
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when i first start it it sounds fine after it warms up 5 mins or so it starts knocking down by oil pan.runs ok no oil pressure loss or power loss just starts knockin when cominig to red lights or at idle and fades away as im driving.
When you come to a red light or idle situation the oil pressure drops because RPM is low. When the engine warms up the oil is thinner, but the engine isn't warmed up after only 5 mins. Does it knock under a load?

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pullin oil pan of today to inspect it any suggestions would be helpful
I would plastigage all the journals on the bottom end to check clearances. How old is the engine?
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Old 03-20-2006, 11:58 AM   #13
 
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sdutch69 just gettin started
runs great under load did notice some play on the bearings though right to left
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Old 03-20-2006, 01:37 PM   #14
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Pull the pan and check the bearings. Then you can eliminate alot of variables. Worked on a Vette one time that had a knock. Pulled the pan. Found a nut loose on a rod cap. It probably won't be that simple. But it will be a good place to start. You may be able to do a quick fix. Maybe just change one bearing until you can do a complete tear-down.
Good luck.
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Old 03-20-2006, 03:21 PM   #15
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I had a jeep that did that. It was a combo of bad gas and a faulty spark plug on the no. 6 cylinder.
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Old 03-20-2006, 06:25 PM   #16
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sounds like a wrist pin, which probly means rebuild time
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Old 03-25-2006, 12:15 PM   #17
 
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sdutch69 just gettin started
Well Pulled All the bearings and replaced them few of them were pretty scored mainly the front two. knocks gone now but kinda wondering what made them get that bad in the first place, kinda thinkin theres a more serious problem that made them go like that.
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