random clinking under the hood - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crm318 · 05-18-2007, 11:21 PM

just the other day. i noticed that there was a clinking coming form the engine compartment. it sounded like the fan was hitting something or like if you put a hand full of pennies in a dryer. i popped the hood and everything was in order. no loose bolts on the pullies and nothing touching the fan. the clinking happens about one fourth of the time that i start it up and it only happens on start up and lasts till i get to my destination (locally). it also only happens under accleoration. could it be a bad water pump or altenator? what do yall think?

mvfd70 · 05-18-2007, 11:28 PM

Water pump bearings???

crm318 · 05-19-2007, 10:18 AM

the next time i hear it, i will try to isolate the sound better.

cdowns · 05-19-2007, 10:32 AM

check the shield on the flywheel its very common for them to eat thru the bottom

EAST SIDE LOW LIFE · 05-19-2007, 10:37 AM

It does not sound like water pump bearings or an alternator to me. Could be in the valve train ..... clinking is a term I'm not familiar with, are you sure it is not a tapping noise that you hear? Hows your timing, could it be a pinging noise? ..... Need more info.

esll.

crm318 · 05-19-2007, 05:11 PM

i guess i could be more specific. its not a valvetrain noise. i have had those in the past. it is a more crisp higher pitch sound. my flywheel doesnt ave a cover also. the sound comes and goes. today i took a 200 mile trip and i stopped at a gas station to fill up. when i took off it started again. i then put the truck in park, and turned the truck off. i i then started it up and the noise was gone. i have no idea what it is. the timming is also set at 11 degrees. what does pinging sound like?

greasemonkey · 05-19-2007, 05:21 PM

You sure when the engine "torques" over when you are accelerating that the fan isn't hitting the shroud?

crm318 · 05-19-2007, 07:41 PM

im pretty sure there is no contact with the fan shroud. there is a thin layer of fine dust on the inside of it and you would be able to see where t makes contact if it did.

chadvicki · 05-19-2007, 08:00 PM

I have the exact same issue that you are mentioning. I know the noise and I describe it the same way as pennies in the dryer. It usually happens in the morning. I thought maybe the chain was hitting something. I am to mechanically inclined. I have no cover also and nothing is loose or is the fan hitting anything. cant wait to find out what it is.

Chad

IAFF2407 · 05-19-2007, 10:38 PM

check you starter, I had the same noise once, kept popping the hood to see if anything was dangling into the fan. I pulled the starter and check the shaft, there was more than a 1/2" play in the shaft. answer was the bendix spring was weak or broken. the gear would slip into the flywheel once in a while. changed the starter and the noise went away. hope this fixes your problem

Sammy · 05-19-2007, 11:58 PM

Is it possible to hear a loose Timing chain?

GREASEMONKEY72 · 05-20-2007, 04:35 AM

Quote:

Originally Posted by Sammy

Is it possible to hear a loose Timing chain?

if its hitting something...yes

GREASEMONKEY72 · 05-20-2007, 04:36 AM

Quote:

Originally Posted by IAFF2407

check you starter, I had the same noise once, kept popping the hood to see if anything was dangling into the fan. I pulled the starter and check the shaft, there was more than a 1/2" play in the shaft. answer was the bendix spring was weak or broken. the gear would slip into the flywheel once in a while. changed the starter and the noise went away. hope this fixes your problem

makes sense to me and explains why you cant see anything

Travis K · 05-20-2007, 11:19 PM

My '71 was doing that this week. Turned out to be a loose header bolt.

lbpd719 · 05-21-2007, 01:35 AM

also beware of the flexplate.. have seen those crack and do the same thing..

they usually crack right at the connection to the crank..

Bowtie001 · 05-21-2007, 12:26 PM

I am going to offer up an odd one that got me in the past - check the condition of the spark plug wire shields that bolt to the heads. I had one of those come loose and it had me for a while. They sound very "tinny" like pennies in a dryer...

-Brian

watahyahknow · 05-21-2007, 12:43 PM

use a long screwdriver hold your ear closed and put the screwdriver against the bone in front of youre ear and the other end of the screwdriver on different parts of the running engine , its basicly a stethoscope wish could let you find more closely where the sound is comming from .
just be careful with long hair jewelery and that sortah stuff around the fan and wirring belts .
it could be the distributionchain hitting the cover

05-18-2007, 11:21 PM	#1
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	random clinking under the hood just the other day. i noticed that there was a clinking coming form the engine compartment. it sounded like the fan was hitting something or like if you put a hand full of pennies in a dryer. i popped the hood and everything was in order. no loose bolts on the pullies and nothing touching the fan. the clinking happens about one fourth of the time that i start it up and it only happens on start up and lasts till i get to my destination (locally). it also only happens under accleoration. could it be a bad water pump or altenator? what do yall think? __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies Last edited by crm318; 05-19-2007 at 10:09 AM.

05-18-2007, 11:28 PM	#2
mvfd70 Registered User Join Date: Jan 2007 Location: Opdyke, IL Posts: 775	Re: random clinking under the hood Water pump bearings??? __________________ 1978 Chevrolet Silverado 3/4 ton 400 small block. 2000 F-250 Powerstroke 2002 GMC Yukon Denali XL

05-19-2007, 10:18 AM	#3
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Re: random clinking under the hood the next time i hear it, i will try to isolate the sound better. __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

05-19-2007, 10:32 AM	#4
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: random clinking under the hood check the shield on the flywheel its very common for them to eat thru the bottom __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

05-19-2007, 10:37 AM	#5
EAST SIDE LOW LIFE Senior Member Join Date: Mar 2007 Location: VANCOUVER ISLAND, B.C., Canada Posts: 1,602	Re: random clinking under the hood It does not sound like water pump bearings or an alternator to me. Could be in the valve train ..... clinking is a term I'm not familiar with, are you sure it is not a tapping noise that you hear? Hows your timing, could it be a pinging noise? ..... Need more info. esll. __________________ Tomorrow is for doing today's stuff. ************************************* This truck has just the right amount of energy for me! Author: Warren Lake .... (member)

05-19-2007, 05:11 PM	#6
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Re: random clinking under the hood i guess i could be more specific. its not a valvetrain noise. i have had those in the past. it is a more crisp higher pitch sound. my flywheel doesnt ave a cover also. the sound comes and goes. today i took a 200 mile trip and i stopped at a gas station to fill up. when i took off it started again. i then put the truck in park, and turned the truck off. i i then started it up and the noise was gone. i have no idea what it is. the timming is also set at 11 degrees. what does pinging sound like? __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies Last edited by crm318; 05-19-2007 at 05:11 PM.

05-19-2007, 05:21 PM	#7
greasemonkey Registered User Join Date: Dec 2001 Location: Pace, FL Posts: 2,155	Re: random clinking under the hood You sure when the engine "torques" over when you are accelerating that the fan isn't hitting the shroud? __________________ 1942 Master Deluxe 1969 C/10 1985 Blazer CUCV 1987 Jimmy 2004 Tahoe 2005 Silverado 1500 2005 Silverado 3500

05-19-2007, 07:41 PM	#8
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Re: random clinking under the hood im pretty sure there is no contact with the fan shroud. there is a thin layer of fine dust on the inside of it and you would be able to see where t makes contact if it did. __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies Last edited by crm318; 05-19-2007 at 07:41 PM.

05-19-2007, 08:00 PM	#9
chadvicki Registered User Join Date: Nov 2006 Location: California Posts: 87	Re: random clinking under the hood I have the exact same issue that you are mentioning. I know the noise and I describe it the same way as pennies in the dryer. It usually happens in the morning. I thought maybe the chain was hitting something. I am to mechanically inclined. I have no cover also and nothing is loose or is the fan hitting anything. cant wait to find out what it is. Chad

05-19-2007, 10:38 PM	#10
IAFF2407 Registered User Join Date: Dec 2005 Location: White Rock Canada Posts: 865	Re: random clinking under the hood check you starter, I had the same noise once, kept popping the hood to see if anything was dangling into the fan. I pulled the starter and check the shaft, there was more than a 1/2" play in the shaft. answer was the bendix spring was weak or broken. the gear would slip into the flywheel once in a while. changed the starter and the noise went away. hope this fixes your problem Last edited by IAFF2407; 05-19-2007 at 10:40 PM.

05-19-2007, 11:58 PM	#11
Sammy Registered User Join Date: Apr 2000 Location: Bonne Terre, Mo Posts: 3,005	Re: random clinking under the hood Is it possible to hear a loose Timing chain? __________________ '69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"

05-20-2007, 11:19 PM	#14
Travis K Registered User Join Date: Mar 2007 Location: Bismarck, ND Posts: 81	Re: random clinking under the hood My '71 was doing that this week. Turned out to be a loose header bolt.

05-21-2007, 01:35 AM	#15
lbpd719 Zappaphile! Join Date: Apr 2007 Location: Los Banos, California Posts: 228	Re: random clinking under the hood also beware of the flexplate.. have seen those crack and do the same thing.. they usually crack right at the connection to the crank.. __________________ 1969 C20 LWB Camper Special - The Beater.. 1998 Cheyenne V6 - 4/6 Drop - For The Son

05-21-2007, 12:26 PM	#16
Bowtie001 Project underway - finally. Join Date: Feb 2007 Location: Greenville, SC Posts: 493	Re: random clinking under the hood I am going to offer up an odd one that got me in the past - check the condition of the spark plug wire shields that bolt to the heads. I had one of those come loose and it had me for a while. They sound very "tinny" like pennies in a dryer... -Brian __________________ 1972 GMC Pre-resto... awaiting allocated funding.

05-21-2007, 12:43 PM	#17
watahyahknow Registered User Join Date: Jul 2006 Location: the netherlands europe Posts: 4,335	Re: random clinking under the hood use a long screwdriver hold your ear closed and put the screwdriver against the bone in front of youre ear and the other end of the screwdriver on different parts of the running engine , its basicly a stethoscope wish could let you find more closely where the sound is comming from . just be careful with long hair jewelery and that sortah stuff around the fan and wirring belts . it could be the distributionchain hitting the cover __________________ i got a job again and having fun at it too idea's for the trucks and the order of things to do are taking shape and get closer to being realized , a few more months and i be able to start building for real i complete 2 of the trucks intoo running fashion one custom and one basicly stock the thirth will be sacrificed for parts



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