Started my valve spring swap!!!
Thread Starter
Drifting
Joined: May 2008
Posts: 1,517
Likes: 319
From: Hewitt TX
Started my valve spring swap!!!
As the title states, it only took me about 45 minutes to get the coil packs off, spark plugs out, vavle covers off, rockers off and push rods out. It has taken me the last couple hours trying to get the damn keepers loose on the forst cylinder I am doing. I can get the ones on the intake valve loose but the exhaust valve starts opening and lets the air pressure out of the cylinder before I can get them loose. I have tapped lightly with a hammer but no luck. it seemed to wor on the intake valve. Any ideas? I am usin a double compressor. I guess I should have gotten a single! 
Tech Contributor
Joined: Jan 2007
Posts: 19,456
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From: Dyer, IN
As the title states, it only took me about 45 minutes to get the coil packs off, spark plugs out, vavle covers off, rockers off and push rods out. It has taken me the last couple hours trying to get the damn keepers loose on the forst cylinder I am doing. I can get the ones on the intake valve loose but the exhaust valve starts opening and lets the air pressure out of the cylinder before I can get them loose. I have tapped lightly with a hammer but no luck. it seemed to wor on the intake valve. Any ideas? I am usin a double compressor. I guess I should have gotten a single!
Thread Starter
Drifting
Joined: May 2008
Posts: 1,517
Likes: 319
From: Hewitt TX
Tech Contributor
Joined: Jan 2007
Posts: 19,456
Likes: 1,165
From: Dyer, IN
You don't need the nylon cord, if the piston is at TDC. Even if the valve drops...it will just rest on the piston, you can still pull it back up by the valve stem.
Le Mans Master
Joined: Dec 2000
Posts: 5,245
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From: Blue Ridge Georgia
How much pressure do you have the compressor set at? I had mine at 90 lbs. I don't understand, put the pressure on and start to tighten the spring compressor then give it a tap with the hammer.
Thread Starter
Drifting
Joined: May 2008
Posts: 1,517
Likes: 319
From: Hewitt TX
My compressor is on 100 psi. I just cant get the damn exhaust valve to break loose. I put som pressure on it with the spring compressor and the valve instantly begins to move. I have spent over a hour tapping on it in various ways and still no luck. I guess I am going with TDC method.
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Tech Contributor
Joined: Jan 2007
Posts: 19,456
Likes: 1,165
From: Dyer, IN
Tech Contributor
Joined: Jan 2007
Posts: 19,456
Likes: 1,165
From: Dyer, IN
Tech Contributor
Joined: Jan 2007
Posts: 19,456
Likes: 1,165
From: Dyer, IN
Hmmmm.....single stage...I would assume. Not much on the CFM there. My guess is, that's part of your problem.
If I remember correctly, the bleed air duct pressure on a 747 was only like 50-60 psi.....it's all about the volume.
If I remember correctly, the bleed air duct pressure on a 747 was only like 50-60 psi.....it's all about the volume.
Last edited by lucky131969; Apr 20, 2011 at 07:14 PM.
Thread Starter
Drifting
Joined: May 2008
Posts: 1,517
Likes: 319
From: Hewitt TX
It says 9.1 SCFM at 90 psi. You are correct on the 747 Bleed Air Duct pressure. That is alot of volume as the ducting is 8-10 inch i think.
Tech Contributor
Joined: Jan 2007
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From: Dyer, IN
Advanced
Joined: Nov 2010
Posts: 64
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From: Waipahu Hawaii
My compressor is on 100 psi. I just cant get the damn exhaust valve to break loose. I put som pressure on it with the spring compressor and the valve instantly begins to move. I have spent over a hour tapping on it in various ways and still no luck. I guess I am going with TDC method.
I just wish the springs themselves were as tough as their keepers! 
I remember using some random 3/8 socket over the retainer to avoid damaging anything important.
Last edited by freeman4ever; Apr 20, 2011 at 08:20 PM. Reason: to add
Thread Starter
Drifting
Joined: May 2008
Posts: 1,517
Likes: 319
From: Hewitt TX
I was on the verge of beating [not tapping] the **** out a few of the valves to get the keepers to give it up. I just wish the springs themselves were as tough as their keepers!
I remember using some random 3/8 socket over the retainer to avoid damaging anything important.
I just wish the springs themselves were as tough as their keepers! I remember using some random 3/8 socket over the retainer to avoid damaging anything important.
Advanced
Joined: Nov 2010
Posts: 64
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From: Waipahu Hawaii
Burning Brakes
Joined: Aug 2007
Posts: 831
Likes: 2
From: Houston Texas
Wow - Have gotten those locks off yet?
Seems you have an issue- all the posts I have read on swapping valve springs seem to suggest all you have to do is "tap" the side of the retainer to loosen the locks- and then compress the springs.
Silly question since you are a mechanic- but you did remove the rocker arms right? If not- that would explain the compressor not holding up the valves.
Seems you have an issue- all the posts I have read on swapping valve springs seem to suggest all you have to do is "tap" the side of the retainer to loosen the locks- and then compress the springs.
Silly question since you are a mechanic- but you did remove the rocker arms right? If not- that would explain the compressor not holding up the valves.
Last edited by NatB; Apr 20, 2011 at 10:10 PM.