Something broke...
Le Mans Master
Joined: Sep 2003
Posts: 8,847
Likes: 795
From: Longview Texas
I thought GM would know how to make springs that do not fail at 35,000 miles by now, unless the engine was over reved or abused.
What is going on?
I thought that without pressure in the cylinder, the valve could drop all the way into the cylinder. If you change springs or guides without removing the head, don't you have to remove the spark plug and pressurize the cylinder to keep the valves from dropping?
What is going on?
I thought that without pressure in the cylinder, the valve could drop all the way into the cylinder. If you change springs or guides without removing the head, don't you have to remove the spark plug and pressurize the cylinder to keep the valves from dropping?
Intermediate
Joined: Jun 2008
Posts: 45
Likes: 0
From: Akron area Ohio
the reason the valve isnt falling is probably because its bent and hanging up in the guide.
If this happened when it was running there is no way in hell i wouldnt pull the head.
upgrade springs, heads and check the piston. Piston should be OK.
If this happened when it was running there is no way in hell i wouldnt pull the head.
upgrade springs, heads and check the piston. Piston should be OK.
Advanced
Joined: Jan 2007
Posts: 93
Likes: 0
From: Florida
Pull the heads. It's really not as painful a process as you may think. Just make sure to replace the head bolts (stretch to torque).
Le Mans Master
Joined: Feb 2003
Posts: 6,683
Likes: 144
From: Memphis Tennessee
I agree with the group here, pull the head and determine everything that is wrong. Short of that, you "could" use a boroscope and look around from the plug opening. You could see the piston at that point, but will not really be able to determine whether you have a bent valve.
By the looks of things (valve still up high in the head) I would bet you do have a bent valve.
Best of luck with her, and get back up and running ASAP.
By the looks of things (valve still up high in the head) I would bet you do have a bent valve.
Best of luck with her, and get back up and running ASAP.
