no pressure in #4 ... lots of ?'s... UPDATED
#315350
05/11/09 08:14 PM
05/11/09 08:14 PM
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Joined: May 2003
Posts: 4,280
Medford OR
FrankenScamp
OP
master
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OP
master
Joined: May 2003
Posts: 4,280
Medford OR
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So my new 340 decided to do the unthinkable...bent valve?? Thats my only guess. Question #1: Will poor oiling to the top end contribute to a bent valve? I have oil to 6 of my 8 rockers(passenger side). Oil does make it to the other 2 but no where near as much. Very slight. What would cause this?? Question #2: If the cam bearing was improperly installed would I have any oil at all to the right side? The left side lubes up just fine. Question #3: Will bending a valve ruin the seat? Or can I just replace the valve if no damage was done to the piston/walls. All other cylinders have 150 psi and all the rockers move as they should. I watched them to make sure the are all moving the same distance up and down. Thanks for taking time to read my post and any info is greatly appreciated. 
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Re: no pressure in #4 all others good. lots of ?'s
[Re: FrankenScamp]
#315351
05/11/09 08:54 PM
05/11/09 08:54 PM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
So my new 340 decided to do the unthinkable...bent valve?? Thats my only guess.
Question #1: Will poor oiling to the top end contribute to a bent valve? I have oil to 6 of my 8 rockers(passenger side). Oil does make it to the other 2 but no where near as much. Very slight. What would cause this??
Question #2: If the cam bearing was improperly installed would I have any oil at all to the right side? The left side lubes up just fine.
Question #3: Will bending a valve ruin the seat? Or can I just replace the valve if no damage was done to the piston/walls.
All other cylinders have 150 psi and all the rockers move as they should. I watched them to make sure the are all moving the same distance up and down.
Thanks for taking time to read my post and any info is greatly appreciated.
I would say if you have oil to the rest of the rockers on that side you have an obstruction in the shaft.
Lots of luck with the bent valve. Guide possibly seized the stem. Probably damaging the piston along with the valve and guide and very possibly the seat. I would never try to put in a new valve with out at least touching up the valve on valve refacer to check for true. I would also make sure to lap the valve in and see where it is seating. Don't try to cut corners.
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Re: no pressure in #4 all others good. lots of ?'s
[Re: MoparforLife]
#315352
05/11/09 09:12 PM
05/11/09 09:12 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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That valve siezed in the guide & it hit a piston? I would pull the dist/inter shaft, turn the crank to the right spot & prime the pump w your drill & see exactly how much flow/distribution you do have & go from there.
live every 24 hour block of time like it's your last day on earth
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Re: no pressure in #4 all others good. lots of ?'s
[Re: Racer413]
#315356
05/11/09 09:27 PM
05/11/09 09:27 PM
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Joined: May 2003
Posts: 4,280
Medford OR
FrankenScamp
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OP
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Medford OR
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Quote:
how new was the 340? if the valve was too tight in the guide it could seize when it heated up.
its a fresh rebuild. The machine shop assembled the heads, I just bolted the motor together. I'm not looking to place blame as the shop is top notch...but they are human and they would b more than willing to help out im sure.
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Re: no pressure in #4 all others good. lots of ?'s
[Re: FrankenScamp]
#315357
05/11/09 09:31 PM
05/11/09 09:31 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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w more thought I think V/P collision from overrevving or from not enough V/P clearance to begin with or(MUCH)less likely the valve siezing in the guide. I think your oiling system is fine.
live every 24 hour block of time like it's your last day on earth
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Re: no pressure in #4 all others good. lots of ?'s
[Re: RapidRobert]
#315358
05/11/09 09:40 PM
05/11/09 09:40 PM
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Joined: Jan 2003
Posts: 10,707
North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,707
North Dakota
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Is it a mechanical or hydraulic cam? If hydraulic you should have no lash, if mechanical what does your cam card call for? How close are you to that number? If the valve is seized chance are it won't move. If actually bent, it probably won't return to closed but it should move towards more open. As a rough guide, take a steel rule and measure the installed height of the spring retainers. That should tell you how your valves compare.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: no pressure in #4 all others good. lots of ?'s
[Re: 734x4PW]
#315364
05/13/09 12:22 AM
05/13/09 12:22 AM
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Joined: Jan 2006
Posts: 366
San Gabriel, CA 91775
rexus31
enthusiast
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enthusiast
Joined: Jan 2006
Posts: 366
San Gabriel, CA 91775
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2007 Dodge Charger R/T, Road and Track Performance Group, Steel Blue
1965 Chrysler 300 Convertible, 383 4V, 727TF, Factory Air, Spanish Red
1964 Pontiac GTO, Tri-Power, 4 Speed, Grenadier Red
"What ain't no country I ever heard of. They speak English in What?" - Jules Winnfield
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Re: no pressure in #4 all others good. lots of ?'s
[Re: FrankenScamp]
#315366
05/13/09 01:04 AM
05/13/09 01:04 AM
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Joined: Jan 2006
Posts: 366
San Gabriel, CA 91775
rexus31
enthusiast
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enthusiast
Joined: Jan 2006
Posts: 366
San Gabriel, CA 91775
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Quote:
Head is off and on its back to the shop tomorrow. I had to double check the seat after seeing the second photo that was just posted cause that's exactaly what my valves/springs look like fron the top.
Thanks for all the help guys. 
So what did it look like? Did the piston look like it took a hit from the valve?
2007 Dodge Charger R/T, Road and Track Performance Group, Steel Blue
1965 Chrysler 300 Convertible, 383 4V, 727TF, Factory Air, Spanish Red
1964 Pontiac GTO, Tri-Power, 4 Speed, Grenadier Red
"What ain't no country I ever heard of. They speak English in What?" - Jules Winnfield
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Pull the plugs out of the shaft and clean it up. Lots of luck with the bent valve. Guide possibly seized the stem. That's be my guess too. Expecially if a valve has a lot of lash. Probably damaging the piston along with the valve and guide and very possibly the seat. Depends. I would never try to put in a new valve with out at least touching up the valve on valve refacer to check for true. I would also make sure to lap the valve in and see where it is seating. Don't try to cut corners. Without a doubt.
