bad sound - The 1947 - Present Chevrolet & GMC Truck Message Board Network

76bonanza · 05-18-2005, 04:02 PM

I just changed my oil drove it checked for leaks hear a knocking sound by were the engine and tranny join together. Can only hear it good when engine idels above idle can not hear but could be because of engine noise. I seem to think this same thing happened last time I changed my oil for like a week?

Any thoughts

Thanks guys

**old Rusty C10** · 05-18-2005, 04:29 PM

hmmm if youre lucky its a flex plate if youre not it could be the motor bearings

76bonanza · 05-18-2005, 05:00 PM

with my stethascope if I put it on the oil pan I dont hear it but if I put it on the bell housing I do hear it. Any reason it would do it when I change my oil or is that just considense?(spelling bad)

bodydropped · 05-18-2005, 05:09 PM

you have an oil passage stopped up some were

**old Rusty C10** · 05-18-2005, 08:38 PM

im willing to bet its the flex plate.. if an oil passage were blocked everytime the truck sat where the oil drained out of the passage it would still bang. keep checking the noise its prolly still there the rest of the time
if you want you could do a motor flush to rule out the blocked oil passage

76bonanza · 05-18-2005, 08:46 PM

if it is a flex plate what would that mean it is loose needs replacing?

**old Rusty C10** · 05-18-2005, 10:35 PM

the flex plate is like a flywheel if its cracked ( thats what makes the noise) its got to be replaced and thats about $50-70 at your local auto parts store the thing is you have to remove the trans or at the very least support it and slide it forward under the body so that you could get to the flex plate

bodydropped · 05-19-2005, 12:22 AM

I just changed my oil drove it checked for leaks hear a knocking sound by were the engine and tranny join together. Can only hear it good when engine idels above idle can not hear but could be because of engine noise. I seem to think this same thing happened last time I changed my oil for like a week?

so if it was the flex plate in my opioion it will be all the time idle and off idle

76bonanza · 05-19-2005, 06:12 PM

Do you think it could just be louder because the new oil is thiner and just seems louder with the new oil?

76bonanza · 05-19-2005, 07:18 PM

Also it is my daily driver and I have no money or time at this point should I be very concerned or mildly concerned?

86swb · 05-19-2005, 07:29 PM

But why would it quit after the oil has been in the engine for a week? Then start up again when he changes oil again. Does not make since (to me any way)

bodydropped · 05-20-2005, 10:16 AM

what oil ur runnin if its a higher grade is because the oil is thick and after awhile it thins but the thick oil takes awhile to get thru the motor if there is restrictions in it my motor i pulled out of my truck had 340,000 miles and it had like oil that was in there for ever that turned in to chunks of stuff but the motor never smoked it used ail because of bad seals but it ran damn good till i spun a rod bearing but it was a factory ls6 motor

76bonanza · 05-20-2005, 04:01 PM

I am running 15 40 castrol synth blend. it is what the previous owner ran for 10 years so I stuck with it.

71-longbed · 05-20-2005, 05:53 PM

unless its really hot where you live ...i'd run 10w30 or 40 ... do you fill the oil filter before you put it up in the engine ??

76bonanza · 05-20-2005, 06:19 PM

yes I do. He was runnin 20w50 and I went back to 15w40

82c10 · 05-20-2005, 07:23 PM

use 15-50 mystik, it's pretty thick, and it might help the noise go away, that might help, maybe for now

cheyguy · 05-20-2005, 07:36 PM

This is to WEIRD!! I noticed the same thing last weekend when I changed my oil. I had a friend look at mine and he said it was a loose torque convertor since the sound went away when I put it in reverse. You might give that a try.

edit: I think I noticed it during the oil change just because I pulled my truck into the garage , so there was more echo. So it didn't really have anything to do with the oil.

76bonanza · 05-20-2005, 07:29 PM

what is mystik? never heard of it.

82c10 · 05-20-2005, 07:41 PM

it's a motor oil, i think you should be able to get it at your local auto parts store

bodydropped · 05-21-2005, 02:13 AM

im runnin 50w vaoline racin oil in my truck my dads dualyl my moms burb my dads hot rod and show truck thats the oil we have been usin for many years and it seem to work good

bodydropped · 05-21-2005, 02:14 AM

its motor honey really really thinck stuff

76bonanza · 05-23-2005, 06:50 PM

One other thing if I warm it up in park and dont run it no sound only after driving around for a while.

05-18-2005, 04:02 PM	#1
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	bad sound I just changed my oil drove it checked for leaks hear a knocking sound by were the engine and tranny join together. Can only hear it good when engine idels above idle can not hear but could be because of engine noise. I seem to think this same thing happened last time I changed my oil for like a week? Any thoughts Thanks guys __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

05-18-2005, 04:29 PM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,310	hmmm if youre lucky its a flex plate if youre not it could be the motor bearings __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

05-18-2005, 05:00 PM	#3
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	with my stethascope if I put it on the oil pan I dont hear it but if I put it on the bell housing I do hear it. Any reason it would do it when I change my oil or is that just considense?(spelling bad) __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

05-18-2005, 05:09 PM	#4
bodydropped Registered User Join Date: Jan 2005 Location: beaumont,tx Posts: 757	you have an oil passage stopped up some were __________________ http://img.photobucket.com/albums/v5...ropped/sig.jpg

05-18-2005, 08:38 PM	#5
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,310	im willing to bet its the flex plate.. if an oil passage were blocked everytime the truck sat where the oil drained out of the passage it would still bang. keep checking the noise its prolly still there the rest of the time if you want you could do a motor flush to rule out the blocked oil passage __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

05-18-2005, 08:46 PM	#6
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	if it is a flex plate what would that mean it is loose needs replacing? __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

05-18-2005, 10:35 PM	#7
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,310	the flex plate is like a flywheel if its cracked ( thats what makes the noise) its got to be replaced and thats about $50-70 at your local auto parts store the thing is you have to remove the trans or at the very least support it and slide it forward under the body so that you could get to the flex plate __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! Last edited by old Rusty C10; 05-18-2005 at 10:37 PM.

05-19-2005, 12:22 AM	#8
bodydropped Registered User Join Date: Jan 2005 Location: beaumont,tx Posts: 757	I just changed my oil drove it checked for leaks hear a knocking sound by were the engine and tranny join together. Can only hear it good when engine idels above idle can not hear but could be because of engine noise. I seem to think this same thing happened last time I changed my oil for like a week? so if it was the flex plate in my opioion it will be all the time idle and off idle __________________ http://img.photobucket.com/albums/v5...ropped/sig.jpg

05-19-2005, 06:12 PM	#9
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	Do you think it could just be louder because the new oil is thiner and just seems louder with the new oil? __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

05-19-2005, 07:18 PM	#10
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	Also it is my daily driver and I have no money or time at this point should I be very concerned or mildly concerned? __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

05-19-2005, 07:29 PM	#11
86swb Born a Chevy Man Join Date: Apr 2005 Location: Navarre, Florida Posts: 10,221	But why would it quit after the oil has been in the engine for a week? Then start up again when he changes oil again. Does not make since (to me any way) __________________ John or 86 (Viet Nam combat Vet-BIG RED ONE) '65-'66 1986 Chevy SWB Silverado 1984 Chevy Longbed Silverado New Kia Sportage (Wife's car and she loves it) CHEVY, American made w/pride! If you can read this, YOU NEED TO THANK A TEACHER! If you can read this in ENGLISH, PLEASE THANK A SOLDIER! GOD BLESS AMERICA AND BLESS OUR FIGHTING TROOPS

05-20-2005, 10:16 AM	#12
bodydropped Registered User Join Date: Jan 2005 Location: beaumont,tx Posts: 757	what oil ur runnin if its a higher grade is because the oil is thick and after awhile it thins but the thick oil takes awhile to get thru the motor if there is restrictions in it my motor i pulled out of my truck had 340,000 miles and it had like oil that was in there for ever that turned in to chunks of stuff but the motor never smoked it used ail because of bad seals but it ran damn good till i spun a rod bearing but it was a factory ls6 motor __________________ http://img.photobucket.com/albums/v5...ropped/sig.jpg

05-20-2005, 04:01 PM	#13
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	I am running 15 40 castrol synth blend. it is what the previous owner ran for 10 years so I stuck with it. __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

05-20-2005, 05:53 PM	#14
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	unless its really hot where you live ...i'd run 10w30 or 40 ... do you fill the oil filter before you put it up in the engine ?? __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

05-20-2005, 06:19 PM	#15
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	yes I do. He was runnin 20w50 and I went back to 15w40 __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO



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05-20-2005, 07:23 PM	#16
82c10 needin' money Join Date: May 2005 Location: Chickasha, Oklahoma Posts: 1,106	use 15-50 mystik, it's pretty thick, and it might help the noise go away, that might help, maybe for now

05-20-2005, 07:36 PM	#17
cheyguy Registered User Join Date: Oct 2002 Location: Manchester, TN Posts: 215	This is to WEIRD!! I noticed the same thing last weekend when I changed my oil. I had a friend look at mine and he said it was a loose torque convertor since the sound went away when I put it in reverse. You might give that a try. edit: I think I noticed it during the oil change just because I pulled my truck into the garage , so there was more echo. So it didn't really have anything to do with the oil. __________________ '71 Cheyenne Super '80 Custom Deluxe '75 Blazer Last edited by cheyguy; 05-20-2005 at 07:43 PM.

05-20-2005, 07:29 PM	#18
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	what is mystik? never heard of it. __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

05-20-2005, 07:41 PM	#19
82c10 needin' money Join Date: May 2005 Location: Chickasha, Oklahoma Posts: 1,106	it's a motor oil, i think you should be able to get it at your local auto parts store

05-21-2005, 02:13 AM	#20
bodydropped Registered User Join Date: Jan 2005 Location: beaumont,tx Posts: 757	im runnin 50w vaoline racin oil in my truck my dads dualyl my moms burb my dads hot rod and show truck thats the oil we have been usin for many years and it seem to work good __________________ http://img.photobucket.com/albums/v5...ropped/sig.jpg

05-21-2005, 02:14 AM	#21
bodydropped Registered User Join Date: Jan 2005 Location: beaumont,tx Posts: 757	its motor honey really really thinck stuff __________________ http://img.photobucket.com/albums/v5...ropped/sig.jpg

05-23-2005, 06:50 PM	#22
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	One other thing if I warm it up in park and dont run it no sound only after driving around for a while. __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

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