Sound diagnosis, knocking?
02-03-2009, 04:44 PM
#1
Sound diagnosis, knocking? Well a friends LT1 is making some racket that I can't seem to figure out, please watch the video and let me know what you think. I'm hoping its not knocking, to my knowledge the motor has never been opened up, its got 161k on it, the trans has been replaced, I guess that happened about a year ago? Oil pressure is over 40 psi at 2k rpms, usually steady around 30psi on a warm idle, one time I did see it fluctuate at idle though.
What's this racket?
Let me know if a better video is needed. I've never actually heard a knocking motor and someone who knows what one sounds like so I have no idea what I'm listening for. Thanks -Corey
What's this racket?
Let me know if a better video is needed. I've never actually heard a knocking motor and someone who knows what one sounds like so I have no idea what I'm listening for. Thanks -Corey
02-03-2009, 04:52 PM
#2
Well a friends LT1 is making some racket that I can't seem to figure out, please watch the video and let me know what you think. I'm hoping its not knocking, to my knowledge the motor has never been opened up, its got 161k on it, the trans has been replaced, I guess that happened about a year ago? Oil pressure is over 40 psi at 2k rpms, usually steady around 30psi on a warm idle, one time I did see it fluctuate at idle though.
What's this racket?
Let me know if a better video is needed. I've never actually heard a knocking motor and someone who knows what one sounds like so I have no idea what I'm listening for. Thanks -Corey
What's this racket?
Let me know if a better video is needed. I've never actually heard a knocking motor and someone who knows what one sounds like so I have no idea what I'm listening for. Thanks -Corey
02-03-2009, 07:33 PM
#6
Bummer, now I know what it sounds like. I'll have to let my friend know its going to go eventually. The car(94 formula) has been driven around like this for a while now actually. Hmm no funds in his case for a 396, probably once it goes I'll help him find another stock LT1 to stick in it for cheap. I learned a lot from my motor swap, I think I could do the next one a lot faster.
02-03-2009, 07:42 PM
#7
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Bummer, now I know what it sounds like. I'll have to let my friend know its going to go eventually. The car(94 formula) has been driven around like this for a while now actually. Hmm no funds in his case for a 396, probably once it goes I'll help him find another stock LT1 to stick in it for cheap. I learned a lot from my motor swap, I think I could do the next one a lot faster.
How long did the whole process take you? did you roll it out on the tranny and axle?
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02-03-2009, 07:59 PM
#8
No I did mine out the top. Hard to say as I usually took a lot more time than was needed as I slowly ordered other parts I needed. I'll probably do this one out the top too if he wants to do a swap. Not sure what he will want to do after this news is delivered.
02-03-2009, 10:44 PM
#11
That rod knock sounds exactly like my previous LT1.
You could remove the engine and trans all at once if you drain all the fluids remove radiator, water pump and take the hood off.
Ive always liked taking it out the top, just found it to be fast and easy.
You could remove the engine and trans all at once if you drain all the fluids remove radiator, water pump and take the hood off.
Ive always liked taking it out the top, just found it to be fast and easy.
02-04-2009, 12:31 AM
#12
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I don't know how I'm going to break the news to the wife Corey! You'll have to do it gently! lol. Thanks for all the help guys and thanks for posting it up Corey!
02-04-2009, 05:16 AM
#14
I really didn't have any issues pulling it from the top last time. I honestly have no idea how many miles it has been driven this way, I do know its more than 500 miles though. His wife has probably a 50-60 mile commute round trip for work.
04-23-2009, 07:04 PM
#15
Ok as a update, are we sure it is def. knocking? I just ask as his wife beats on this thing, probably put 3k miles on it since posting this up. If its something really bad can you see metal particles in the oil? Going to do a oil change on it I guess.
04-24-2009, 10:39 AM
#19
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Yea, check the oil for sure. Pull the filter and cut it open and inspect that as well. If there is bearing material or metal parts coming apart in there, it'll show up in the pan and filter. Go from there.
04-25-2009, 05:10 PM
#20
an easier way to check for metal is to use a paint strainer or even a rag over a container. i always use paint strainers and they will pick out pretty much everything.