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Joined: Aug 2022
Posts: 9 Likes: 1
Grease Monkey
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OP
Grease Monkey
Joined: Aug 2022
Posts: 9 Likes: 1 |
Well with every win there is bound to be a stumbling block. Feeling pretty good about getting the 1941 216 engine unseized, with my wife's help we took a peek under the valve cover. Wouldn't you know it. I have one valve that is stuck. I have an exhaust valve stuck open. Any ideas on the easiest way to loosen it up? I took the rockers off and have been soaking it down with MMO. Figured it worked for the cylinders. I'm not against pulling the head as a last resort but want to try everything else first. All of your experience is greatly appreciated.
1941 Chevy Special Deluxe 2 door sedan
1960 Chevy Impala flat top sports sedan
1961 Chevy Apache C30 step side long box
1966 Chevy Bel Air Sedan
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Joined: Feb 2002
Posts: 562 Likes: 1
Oil Can Mechanic
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Oil Can Mechanic
Joined: Feb 2002
Posts: 562 Likes: 1 |
If you can get a vise grip on the valve stem try to rotate it, wiggle back and forth and keep soaking it. Might try heating the valve guide with a torch.
Dick
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Joined: Jan 2006
Posts: 7,046 Likes: 107
Hall Monitor ChatMaster - 7,000
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Hall Monitor ChatMaster - 7,000
Joined: Jan 2006
Posts: 7,046 Likes: 107 |
I've read accounts of other having success by soaking in various penetrants and lubricants. What worked for me was pulling the head and doing a valve job. Said valve job included the manual cleaning of all valves.
VCCA Member 43216
Save a life, adopt a senior shelter pet.
1938 HB Business Coupe
1953 210 Sedan
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Joined: Sep 2007
Posts: 654 Likes: 3
Oil Can Mechanic
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Oil Can Mechanic
Joined: Sep 2007
Posts: 654 Likes: 3 |
I used penetrant and a rubber hammer to tap on the top of the valve springs on an old Continental overhead valve engine.
Last edited by J Franklin; 08/18/22 10:50 PM.
J Franklin
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Joined: Nov 2001
Posts: 19,758 Likes: 63
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 63 |
I have used a brass drift and hammer to tap on the top of the valve stem. Together with penetrating oil have never found one that I couldn't get to move and eventually move up and down with the push rod. As the valve gets further open the spring exerts more upward pressure and eventually enough to start to move it up a little bit. Continued working a little bit at a time is the key.
How Sweet the roar of a Chevy four!
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Joined: May 2002
Posts: 6,149 Likes: 42
ChatMaster - 6,000
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ChatMaster - 6,000
Joined: May 2002
Posts: 6,149 Likes: 42 |
Keep soaking and gentle tapping, mostly if you are not in a hurry it will eventually come loose. Make sure the piston for the cylinder is at least an inch down the bore so there is no chance of punching piston and valve together causing naughty words.
Tony
1938 1/2 ton Hope to drive it before I retire
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Joined: Sep 2006
Posts: 1,255 Likes: 10
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: Sep 2006
Posts: 1,255 Likes: 10 |
I helped an aircraft mechanic unstick a valve some time back. Take a piece of hemp or other natural fiber rope and thread it into the spark plug hole leaving a pigtail out to facilitate future removal. Turn the engine over by hand to get that cylinder on top center, or as close as possible. Then you can remove the valve spring keepers and spring. He used a loose drill chuck tightened onto the valve stem to move it up and down with lubricant without worry that it could drop down into the combustion chamber. He would tap it down and then use a mechanics heel bar to carefully pry the drill chuck back up. After loosening it up everything can be put back together, and then the rope removed. This method won't damage the valve stem. And the natural fiber that may be shed by the rope will just burn up.
Art
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