Threw a rod this weekend!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Zumo · 07-28-2003, 09:15 AM

Maybe.

I have only had the truck a year and a half. The motor was previously rebuilt before I got it with mabye 4000 miles since rebuild. I saw the receipts. Any how, just cruising down the high way and I start to hear a terrible clapping sound. Limp over to the side of the road and the sound gets louder and harder as I pull over. Then the motor dies.

I Got towed home. Truck still starts, just with a horrible knocking.

Am I right? A rod thrown? I think I can get by with just replacing the short black right? It's a 307 are the other parts interchangable with w 350?

Anyway, I was pi$$ed.

krue · 07-28-2003, 09:27 AM

Everything off your should bolt up to a 350. I don't know if your heads will be what you want on a 350.
That sux about your engine. Why I am thinking about a crate motor with a warranty!

Zumo · 07-28-2003, 09:54 AM

Yeah, I was thinking of upgrading the heads.

jewels. · 07-28-2003, 11:48 AM

zumo,

when my straight six went, it wasnt a rod. the head dropped a valve, which knocked around in the piston cylinder for about 30 seconds, and then rammed itself into the side of the front cylinder wall. (this consequently shattered the piston, dropped the piston rod, which rammed up into the bottom of the block). anyways, i pulled the head, and found an additional two valves were completely frozen.

because of that whole experience, i believe upgrading the heads is the way to go. hopefully, there isnt any damage to the block. but as long as that engine is knocking, DONT RUN IT if you can avoid it!

good luck tearin her apart, and let us know what the outcome is!

jewels.

chevy_fatman · 07-28-2003, 12:09 PM

Did you take the valve covers off yet to see what was the damage?
I had the same kind of problem on the highway when I was going to KS earlier this month, I was doing maybe 70 mph and all of a sudden I heard this snappind/popping loud noise, I pulled over and checked real quick under the hood, and everytime I'd hit the gas the clapping would get louder, I limped to the next exit and got to a shop, guy there listened to my motor and it said it was either a rocker arm or a pushrod, I pulled the valve covers off and sure enough, a rocker arm had broken in half!, replaced it and $40 later I was on my way, just ask Longhormail, he saw that rocker arm.

I hope that you only have the same problem I had, good luck tearing that motor apart.

GMCrazy · 07-28-2003, 12:29 PM

it couldnt be a rod, or it would'nt be runnin and you would most likely have a large exit hole in the block . hopefully it's like they have said, and you've just got a valvetrain problem. much luck!

Zumo · 07-28-2003, 12:30 PM

Well I pulled one side and it looked fine. I really havent had time to look at it since I am putting up a privacy fence. That was what I was using it for. I was lucky I was able to pick up all the lumber before it crapped out on me. I'll probably look at it in a few days.

RED71CHEVY · 07-28-2003, 01:01 PM

my 327 imploded about 2 months ago, same kind of noise, also on the interstate, mine broke the crank under a cap.

bigvinnie · 07-28-2003, 03:04 PM

it's pretty easy to tell an upper end problem from a lower end one by the sound, and the location... you may have spun a bearing or two, which would allow the motor to run but have a serious lower end knock...

Zumo · 07-28-2003, 03:11 PM

Quote:

Originally posted by GMCrazy
it couldnt be a rod, or it would'nt be runnin and you would most likely have a large exit hole in the block . hopefully it's like they have said, and you've just got a valvetrain problem. much luck!

Right, That's why I need to look a little deeper into it. I figure once I pull the valve covers I'll find out more.

07-28-2003, 09:15 AM	#1
Zumo Hot Rods For Life Join Date: Sep 2001 Location: Waxahachie, TX Posts: 3,305	Threw a rod this weekend!!! Maybe. I have only had the truck a year and a half. The motor was previously rebuilt before I got it with mabye 4000 miles since rebuild. I saw the receipts. Any how, just cruising down the high way and I start to hear a terrible clapping sound. Limp over to the side of the road and the sound gets louder and harder as I pull over. Then the motor dies. I Got towed home. Truck still starts, just with a horrible knocking. Am I right? A rod thrown? I think I can get by with just replacing the short black right? It's a 307 are the other parts interchangable with w 350? Anyway, I was pi$$ed. __________________ 1968 C10 LWB **SOLD* Andy Viva Los Bicicletas! Los Muertos Custom Bicycles Last edited by Zumo; 07-28-2003 at 03:11 PM.

07-28-2003, 09:27 AM	#2
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Everything off your should bolt up to a 350. I don't know if your heads will be what you want on a 350. That sux about your engine. Why I am thinking about a crate motor with a warranty! __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

07-28-2003, 09:54 AM	#3
Zumo Hot Rods For Life Join Date: Sep 2001 Location: Waxahachie, TX Posts: 3,305	Yeah, I was thinking of upgrading the heads. __________________ 1968 C10 LWB **SOLD* Andy Viva Los Bicicletas! Los Muertos Custom Bicycles

07-28-2003, 11:48 AM	#4
jewels. Registered User Join Date: Jul 2001 Location: Munster, IN Posts: 1,100	zumo, when my straight six went, it wasnt a rod. the head dropped a valve, which knocked around in the piston cylinder for about 30 seconds, and then rammed itself into the side of the front cylinder wall. (this consequently shattered the piston, dropped the piston rod, which rammed up into the bottom of the block). anyways, i pulled the head, and found an additional two valves were completely frozen. because of that whole experience, i believe upgrading the heads is the way to go. hopefully, there isnt any damage to the block. but as long as that engine is knocking, DONT RUN IT if you can avoid it! good luck tearin her apart, and let us know what the outcome is! jewels. __________________ 68 C10 Red Step 350 my first child & main focus 58 3200 Apache LWB Step the upcoming project

07-28-2003, 12:09 PM	#5
chevy_fatman Where's my beer? Join Date: Aug 2002 Location: I live in the state of denial.... Posts: 5,621	Did you take the valve covers off yet to see what was the damage? I had the same kind of problem on the highway when I was going to KS earlier this month, I was doing maybe 70 mph and all of a sudden I heard this snappind/popping loud noise, I pulled over and checked real quick under the hood, and everytime I'd hit the gas the clapping would get louder, I limped to the next exit and got to a shop, guy there listened to my motor and it said it was either a rocker arm or a pushrod, I pulled the valve covers off and sure enough, a rocker arm had broken in half!, replaced it and $40 later I was on my way, just ask Longhormail, he saw that rocker arm. I hope that you only have the same problem I had, good luck tearing that motor apart. __________________ Paul How do you make the invisible, visible?.........You take it away.

07-28-2003, 12:29 PM	#6
GMCrazy David Tye Join Date: Jul 2003 Location: Abbeville, Alabama Posts: 52	it couldnt be a rod, or it would'nt be runnin and you would most likely have a large exit hole in the block . hopefully it's like they have said, and you've just got a valvetrain problem. much luck! __________________ David -68 GMC w/327

07-28-2003, 12:30 PM	#7
Zumo Hot Rods For Life Join Date: Sep 2001 Location: Waxahachie, TX Posts: 3,305	Well I pulled one side and it looked fine. I really havent had time to look at it since I am putting up a privacy fence. That was what I was using it for. I was lucky I was able to pick up all the lumber before it crapped out on me. I'll probably look at it in a few days. __________________ 1968 C10 LWB **SOLD* Andy Viva Los Bicicletas! Los Muertos Custom Bicycles Last edited by Zumo; 07-28-2003 at 03:08 PM.

07-28-2003, 01:01 PM	#8
RED71CHEVY Registered User Join Date: Dec 1999 Location: LEXINGTON,SC,USA Posts: 208	my 327 imploded about 2 months ago, same kind of noise, also on the interstate, mine broke the crank under a cap. __________________ TIM '71 CUSTOM C-10 torch red ,350 roller GM crate,3.73 GEARS, REAR 4"DROP SPRING, FRONT 2.5" DROP SPINDLE-1.5"lower spring, FRONT=17x8(4.5bs) W/265-60-17, BACK=17x9.5 (5bs)W/285-60-17, Vintage Air Sure Fit AC------NEVER ENDING PROJECT!!

07-28-2003, 03:04 PM	#9
bigvinnie Registered User Join Date: Aug 2001 Location: escondido, ca 92026 Posts: 1,222	it's pretty easy to tell an upper end problem from a lower end one by the sound, and the location... you may have spun a bearing or two, which would allow the motor to run but have a serious lower end knock... __________________ '72 short step, 350, 700R4, tilt, ps, pdb, a/c, lowered coils, etc., other work in progress... San Diego, CA 72 Stepside Project



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