Head valve adjustment
Thread Starter
Cruising
Joined: Jun 2018
Posts: 12
Likes: 7
From: Chicago
Dropped Head valve
Drivers side intake valve cylinder #3 dropped during some maintenance work, dropped by about 1 inch(intake manifold is off the car) and I can see the rocker arm pressed downward. What’s the best way to go about lifting the intake valve while the head is still attached to the block. Any help would be great!
thanks
thanks
Last edited by DemonZ; May 5, 2021 at 08:40 PM.
Drifting
Joined: Mar 2015
Posts: 1,421
Likes: 302
From: CSRA, SC
Sounds like the valve keepers popped out? If the spring was there the valve wouldn't have dropped. You'll probably need a spark plug air hose to pump up the cylinder to hold the valve up while you reinstall the keepers. What happened to drop the valve?
Thread Starter
Cruising
Joined: Jun 2018
Posts: 12
Likes: 7
From: Chicago
Last edited by DemonZ; May 6, 2021 at 09:45 AM.
Drifting
Joined: Mar 2015
Posts: 1,421
Likes: 302
From: CSRA, SC
Maybe a pic would help but I fail to understand how a valve can just "fall" when the spring is pushing it up as designed with almost 100lbs of force unless you rotated the engine and the cam opened the valve.
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,668
I agree. If the spring, retainer, and keepers are in place, even checking springs are powerfull enough to seat the valve. More info, and maybe a pic, would be helpful.......
Acct Suspended APR 2026 by request
Joined: Dec 2010
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2020 Corvette of the Year Finalist (performance mods)
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I'm confused too, he said the rocker tip was down so the valve should be open... you also don't need a valve spring tool to remove the rocker, just take the bolt out... the keepers will hold the retainers and springs in place assuming none of the keepers have popped out which is not very likely but always possible
Last edited by StingrayRebel; May 6, 2021 at 10:55 AM.
Thread Starter
Cruising
Joined: Jun 2018
Posts: 12
Likes: 7
From: Chicago
is it possible the intake valve on cylinder #3 is perfectly normal? I noticed all the other intake valves are sealed closed but the intake valve in cylinder #3 is open. I noticed the intake valve to be open after I vacuumed the port during some maintenance work. In the pictures shown you can see the valve spring is compressed by rocker #3 and intake valve is in the open position. Don’t want to bolt on the manifold and fire up the car and possibly have a valve issue.
Last edited by DemonZ; May 6, 2021 at 07:19 PM.
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Drifting
Joined: Mar 2018
Posts: 1,365
Likes: 414
From: New Jersey
Why do you think the valve shouldn't be open? That's what valves do, they open and close. If your worried you can turn the engine by hand and watch if the valve opens and then closes. If you continue to turn the engine another valve will open and close. If it's working just start it up, it will be fine.
Le Mans Master
Joined: Jul 2010
Posts: 6,013
Likes: 726
OIf it was me i would turn the engine, Not crank turn by hand with tool. The valve will move there is nothing wrong here. If there is speedy007 will by you dinner.
Team Owner
Joined: May 2001
Posts: 87,375
Likes: 1,593
From: Western NY
I'll toss this into the mix, "just because". In one of the pictures that "demon" posted, it does look like there's a fair amount of carbot in that valve that's open. Anybody think that maybe a chunk of carbon is stuck on the valve seat, keeping the valve partially open?
Thread Starter
Cruising
Joined: Jun 2018
Posts: 12
Likes: 7
From: Chicago
thanks to everyone for the advice. I ended up turning
the engine over by hand and everything was working properly.
Last edited by DemonZ; May 9, 2021 at 11:51 PM.