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11-18-2012, 10:13 AM
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#1 |
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Registered User
Join Date: Nov 2012
Location: jacksonville, Florida
Posts: 29
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350 unkown problem
I pulling away from a stop light like normal and I here a snapping sound and the engine shut off. And if I got to crank it I hear a tinking sound and it tried to crank but it don't. Idk if the timing chain broke or what. I haven't tore it apart yet. It seems like if the timing chain broke it wouldn't be trying to crank. Also earlier that night I before that happened I got into the throttle pretty good coming off of a light and when I let out of it around 4500 it wouldn't go down to idle and it stayed at 1400 and when I got home it was back to normal. Any help would be great. Thanks
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11-18-2012, 10:35 AM
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#2 |
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Active Member
 
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: 350 unkown problem
What engine?
Symptoms indicate stripped cam/crank timing gears or broken timing chain.
__________________
68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
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11-18-2012, 10:43 AM
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#3 |
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Registered User
Join Date: Nov 2012
Location: jacksonville, Florida
Posts: 29
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Re: 350 unkown problem
SBC 350. We just put a new lunatic cam kit in and reworked the heads
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11-18-2012, 03:33 PM
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#4 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,238
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Re: 350 unkown problem
sounds like the cam broke
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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11-18-2012, 04:16 PM
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#5 |
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Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: 350 unkown problem
You can check to see if it's cam, timing chain/gear by removing valve covers and turning or cranking the engine to see if the valves go up and down.
__________________
68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
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11-20-2012, 07:31 PM
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#6 |
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Justified!
Join Date: Apr 2007
Location: Valencia, Ca
Posts: 1,366
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Re: 350 unkown problem
So you are saying the motor turns over when you are trying to start it? And it makes the tinking sound consistantly? or it goes "tink" and stops, and does not move any more?
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Chad 1964 GMC Fleetside Shortbed....350/700R4 tranny 
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11-20-2012, 08:35 PM
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#7 |
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Registered User
Join Date: Nov 2012
Location: jacksonville, Florida
Posts: 29
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Re: 350 unkown problem
It was consistant but we pulled the head and we found that the #8 exhaust valve had broken and fell into the cylinder but luckily the cylinder wall and everything is fine.
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11-20-2012, 08:45 PM
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#8 |
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Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,948
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Re: 350 unkown problem
How big of a cam? Did you install new valve springs? Its extremely odd for a valve to just break. Usually they dont break until they are hit by a piston. Once in a while the valve face will break off of the stem. Theres something else wrong. The engine would still run with one dead hole.
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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11-20-2012, 09:19 PM
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#9 |
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Registered User
Join Date: Nov 2012
Location: jacksonville, Florida
Posts: 29
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Re: 350 unkown problem
The cam is 465 intake lift 4.88 exhaust lift 224 intake Duration and 234 exhaust duration @50 and yes new valve springs were installed. The Guy that built my dads motor is the one doing the work and he was able to crank it up. I didn't procced to continue trying to crank it after I heard the noise it was making. And I think that's where it broke at the face.
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11-20-2012, 09:56 PM
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#10 |
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Registered User
Join Date: Nov 2012
Location: jacksonville, Florida
Posts: 29
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Re: 350 unkown problem
Cause the stem was still in the keepers
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