Getting closer to figuring out what happened to my motor..... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Zumo · 08-02-2003, 07:44 PM

Looks like I may have "dropped a valve".
This pics seems to depict valve guide damage:

Zumo · 08-02-2003, 07:47 PM

Another pic.

I am in the process of taking the head off to send it to the machine shop to get it checked.

*racedvl* · 08-02-2003, 08:27 PM

Is the inner spring broken? I had broken a spring before, changed the spring, and she still running.

Class of 69 · 08-02-2003, 09:06 PM

The piece in his hand is the bronze guide, not part of a spring. I don't remember the engine history, or circumstances of the damage, but I hope the valve didn't hit the piston. Would take a serious hit on the valve face to force the stem to break the guide. It has obviously had exhaust leaking past the seat also, to be going up the stem. I will hope it's just a simple fix for ya!

Zumo · 08-04-2003, 10:24 AM

I hope so. I will be taking the head of this week to see if there is more damage. I reall hadn't had time to mees with it, although I did take the exhaust of this weekend. If I can save the head Ill send it to the machine shop.

beautimus · 08-04-2003, 07:54 PM

might not be a "dropped" valve as in broke it.
may be a case of "floated" one . like overreved and the spring couldn't return the valve to its seat in time and piston pushed it closed and bent it slightly, poping the side out of the guide.
i don't know the circumstances so its hard to say.
you may get lucky and find a small circular scar on the piston top, and a valve and guide that needs attention. or if your luck is like mine, a broken valve, a cracked head, and a busted piston .
good luck, Tony

Dandeluxe · 08-04-2003, 10:54 PM

Zumo,
this is wild that is almost exactly the same exact thing that happened to my 350 i pulled my head and it put an oval shape mark in my piston. it was on the passenger side at the no. 2 of valve intake on the no. 4 piston cylinder. i took the head to a machine shop and they told me it would cost 300 dollars they said i should just buy a new head so i think ill try to find a new head at the junkyard. and rebuild it im so sick of this crap im ready to throw in the towel and sell all . i think it's a test these trucks are a big test . oh well, DAN

jewels. · 08-04-2003, 11:37 PM

hey zumo, and all the others subscribed --- here is the original thread that zumo posted about his motor having problems --- you can read up on what happened:

Zumo's Motor Problem Thread a short while ago

beautimus · 08-05-2003, 03:24 AM

thanks jewels

well after reading the previous thread , i gotta say that blows my theory out of the water. i never heard of a valve doing anything like that just cruizin down the road.
i just can't understand how the keepers are still in place
and yet the valve guide is busted.
let us know what you find. this is a new one on me.
Tony

08-02-2003, 07:44 PM	#1
Zumo Hot Rods For Life Join Date: Sep 2001 Location: Waxahachie, TX Posts: 3,305	Getting closer to figuring out what happened to my motor..... Looks like I may have "dropped a valve". This pics seems to depict valve guide damage: __________________ 1968 C10 LWB **SOLD* Andy Viva Los Bicicletas! Los Muertos Custom Bicycles Last edited by Zumo; 10-04-2007 at 10:08 PM.

08-02-2003, 07:47 PM	#2
Zumo Hot Rods For Life Join Date: Sep 2001 Location: Waxahachie, TX Posts: 3,305	One more pics Another pic. I am in the process of taking the head off to send it to the machine shop to get it checked. __________________ 1968 C10 LWB **SOLD* Andy Viva Los Bicicletas! Los Muertos Custom Bicycles Last edited by Zumo; 10-04-2007 at 10:08 PM.

08-02-2003, 09:06 PM	#4
Class of 69 Registered User Join Date: Mar 2003 Location: Stillwater MN Posts: 1,166	The piece in his hand is the bronze guide, not part of a spring. I don't remember the engine history, or circumstances of the damage, but I hope the valve didn't hit the piston. Would take a serious hit on the valve face to force the stem to break the guide. It has obviously had exhaust leaking past the seat also, to be going up the stem. I will hope it's just a simple fix for ya! __________________ 69 GMC K10 ..some restoration required....still..

08-04-2003, 10:24 AM	#5
Zumo Hot Rods For Life Join Date: Sep 2001 Location: Waxahachie, TX Posts: 3,305	I hope so. I will be taking the head of this week to see if there is more damage. I reall hadn't had time to mees with it, although I did take the exhaust of this weekend. If I can save the head Ill send it to the machine shop. __________________ 1968 C10 LWB **SOLD* Andy Viva Los Bicicletas! Los Muertos Custom Bicycles

08-04-2003, 07:54 PM	#6
beautimus Registered User Join Date: Mar 2002 Location: woodstock, alabama, usa Posts: 938	might not be a "dropped" valve as in broke it. may be a case of "floated" one . like overreved and the spring couldn't return the valve to its seat in time and piston pushed it closed and bent it slightly, poping the side out of the guide. i don't know the circumstances so its hard to say. you may get lucky and find a small circular scar on the piston top, and a valve and guide that needs attention. or if your luck is like mine, a broken valve, a cracked head, and a busted piston . good luck, Tony __________________ i survived cancer and kidney stones, but my kids are killing me.

08-02-2003, 08:27 PM	#3
racedvl Account Suspended Join Date: Jan 2000 Location: Woodstock, IL Posts: 7,020	Is the inner spring broken? I had broken a spring before, changed the spring, and she still running.

08-04-2003, 10:54 PM	#7
Dandeluxe Senior Member Join Date: Nov 2001 Location: st.louis mo. Posts: 717	head damage Zumo, this is wild that is almost exactly the same exact thing that happened to my 350 i pulled my head and it put an oval shape mark in my piston. it was on the passenger side at the no. 2 of valve intake on the no. 4 piston cylinder. i took the head to a machine shop and they told me it would cost 300 dollars they said i should just buy a new head so i think ill try to find a new head at the junkyard. and rebuild it im so sick of this crap im ready to throw in the towel and sell all . i think it's a test these trucks are a big test . oh well, DAN __________________ 1969 cst swb 350/400 th . DANNY C . ["]FRIENDS DONT LET FRIENDS DRIVE F@RD$!! 1969 cst swb corvette hugger orange with 400 hp sbc I started out with nothing and i held on to it

08-04-2003, 11:37 PM	#8
jewels. Registered User Join Date: Jul 2001 Location: Munster, IN Posts: 1,100	hey zumo, and all the others subscribed --- here is the original thread that zumo posted about his motor having problems --- you can read up on what happened: Zumo's Motor Problem Thread a short while ago __________________ 68 C10 Red Step 350 my first child & main focus 58 3200 Apache LWB Step the upcoming project

08-05-2003, 03:24 AM	#9
beautimus Registered User Join Date: Mar 2002 Location: woodstock, alabama, usa Posts: 938	thanks jewels well after reading the previous thread , i gotta say that blows my theory out of the water. i never heard of a valve doing anything like that just cruizin down the road. i just can't understand how the keepers are still in place and yet the valve guide is busted. let us know what you find. this is a new one on me. Tony __________________ i survived cancer and kidney stones, but my kids are killing me.



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