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Farmall & IHC Tractors Discussion Forum
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OT broken valve spring

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Bummer

12-23-2006 01:10:40




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Has anybody else had this problem with a newer Chevy truck? I started my to warm up little the other day and when I came out to go it was chugging and missing and after changing what the computer said was bad I now have to pull the pass side head and change a valve spring and check the piston for damage. Also should I change all the springs on both heads or just fix the one cylinder. Thanks




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Fromjb2

12-23-2006 13:52:23




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 Re: OT broken valve spring in reply to Bummer, 12-23-2006 01:10:40  
Hi Bummer, I don't know if you can still do the old mechanic's trick with the nylon rope on the newer Chevy engines or not.
Here is the trick:
1)Remove spark plug from bad cylinder and with piston in the down position, tie a big knot on one end of 1/4 inch nylon rope and feed the other end in thru the spark plug hole into the engine cylinder, then rotate engine with socket wrench on crankshaft pulley nut until piston and rope limit at the top. This will hold valve in closed position.
2)Now with proper tools remove and replace valve spring.
3)With socket wrench on crankshaft pulley nut, reverse direction until rope can be remove from spark plug hole.

Good luck
JB2

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Shaggy

12-23-2006 12:57:21




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 Re: OT broken valve spring a little more info in reply to Bummer, 12-23-2006 01:10:40  
Hello.
The bad valve spring is in my truck. Its a 02 Chevy with a 6.0 with 53,000 miles and it all started with a miss on what seemed to be 1 cylinder and then it was 2 (1 and 3) but the bad spring is on #4 and it did bounce on the piston for a few seconds. Thanks for the help and Merry Christmas!
Shaggy and Family



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El Toro

12-23-2006 04:17:51




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 Re: OT broken valve spring in reply to Bummer, 12-23-2006 01:10:40  
I wouldn't pull the head. I would do as Tom has suggested. I did that on a 1957 Chevy. You will need to get that piston to TDC on the compression
stroke. When you remove that sparkplug reconnect it to the plug wire. With the plug grounded have some slowly bump the engine over until the plug fires with the starter. You may need to pull the
other plug wires to keep the engine from starting.
Put a piece of tape on the other wires and a number as to where they were removed. That was the first valve spring that I had to break. I should've installed new springs when we redid the head. Hal

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Allan In NE

12-23-2006 04:17:32




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 Re: OT broken valve spring in reply to Bummer, 12-23-2006 01:10:40  
That is a very rare failure. Are you sure it is a broken valve spring?

They can be swapped out in about 40 minutes.

Allan



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Jollyrancher OH

12-23-2006 03:08:38




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 Re: OT broken valve spring in reply to Bummer, 12-23-2006 01:10:40  
My 88 chevy 350 kept breaking springs after after 4th one it bent a valve so I changed both heads



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Tom in Central Pa

12-23-2006 03:01:58




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 Re: OT broken valve spring in reply to Bummer, 12-23-2006 01:10:40  
I would only replace the one spring, without removing the head. On the older models, it was possible to pressurize the cylinder thru the sparkplug hole with compressed air. Pull up and close the valve, the compressed air would hold it there. Then using the proper spring compressor, remove the valve retainer and replace as necessary. All the tools I used, air fitting, compressor, were from K-D.



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KEB

12-23-2006 08:17:02




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 Re: OT broken valve spring in reply to Tom in Central Pa, 12-23-2006 03:01:58  
If you use compressed air, make sure the engine can't turn, or better yet put the cylinder you're working on at bottom dead center. Once you've removed the rocker, the valve can stay closed regardless of the position of the camshaft.

A compression tester with a removable guage on the end of a hose makes a nice adapter. Mine has the same male quick coupler on the end of the hose that air tools do.

Keith

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