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Any more ideas for a stuck valve?

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Mike Schotte

02-08-2003 18:07:02




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The '49 SC project tractor now has a free engine- but I still have a stuck valve holding everything else up.

I tried the rope trick last weekend and stuffed all the nylon rope I could get into the cylinder. Well- it wasn't enough. There's still too much clearance and I'm able to rotate the engine 360 degrees without it pushing up on the underside of this valve.

third party image

I've got the valve tapped ALL the way down now, and the pushrod removed. I've tried prying, tapping, and channel locks to rotate the valve, but it's not budging.

Anybody have any ideas how to get this thing to move? I don't know how much stress that valve keeper can take- and I'd really like to keep that valve spring from flying out and taking my teeth with it...

-Schotte

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JRN

02-14-2003 20:19:32




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 Re: Any more ideas for a stuck valve? in reply to Mike Schotte, 02-08-2003 18:07:02  
If you pull up on the valve, pull STRAIGHT up. A valve stem the size of the ones on an SC will bend easily and just a very slight bend will make the valve stick worse. If you do pull the head and tap the valve up from below, once again be careful. A little tweak on the valve stem in the valve head area means a leaking and eventually burned valve.



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dave

02-12-2003 20:16:41




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 Re: Any more ideas for a stuck valve? in reply to Mike Schotte, 02-08-2003 18:07:02  
Perhaps this is not going to effect your situation, but this last fall at our tractor show we had a gas engine that a valve had stuck while running. After spinning it with a battery powered drill for 20 min. and squirting wd-40, oil and much foul language by all of us old experienced know it all's--- A young whipper snapper came up and with my permission gave it a shot of starting fluid around the valve guide. You could still hear the hiss from the spray cans first hisssss when it completly freed it up. It started right off and ran for 2 more show days without a bit of problems. Us old timers swore to never telling anyone of this so I decided to type it instead. Totaly unbelievable.

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BLR

02-10-2003 20:07:57




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 Re: Any more ideas for a stuck valve? in reply to Mike Schotte, 02-08-2003 18:07:02  
Mike,
I can't tell exactly from the pic you have posted, but if you have any spring compression left you can give the following a try.

1. Put the #3 piston on top dead center. Maybe even stuff the the nylon cord in if you can. This will prevent the valve from falling down when you get it loose.

2. Roll the rocker arm over, using 2 screw drivers or prybars position them so the blade end is reacting on the rocker and the shanks are on each side of the valve stem. By pushing down you may be able to release the valve spring cap enough to get the retainers out and then the spring off. If that can happen maybe you can get the valve loose by twisting. Actually, it used to be possible to purchase an overhead spring compressor to do this kind of thing. It might be worth a trip to your local NAPA store to see if they have one.

3. If you are successful you can reverse the process. Using a spark plug, you may want to fabricate an adapter that you can hook up to an air compressor to keep the valve in. If you can pack enough cord in that may be adequate as well.

Good luck and let us know how you do.

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Jerry

02-10-2003 06:44:08




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 Re: Any more ideas for a stuck valve? in reply to Mike Schotte, 02-08-2003 18:07:02  
If you have the carb. off of this engine, try using a small propane torch through the pluge hole. Sometimes a little heat goes a long way. Keep a hand on the valve stem and you may be able to feel the heat, after it cools it will most likely come loose.



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Ralph in NH

02-09-2003 13:46:39




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 Re: Any more ideas for a stuck valve? in reply to Mike Schotte, 02-08-2003 18:07:02  
Hi Mike
My 2 cents. All I know is, I had three stuck valves like that in my 49 LA last fall and I let them soak in PB Blaster. Don't know if you have that around your area but it's the best stuff since sliced bread. I also had three bent push rods and I have gotten all the valves free with that stuff. Haven't started the old girl yet but she's all freed up. What all these other guys said was great advice and they certainly know a lot more than me about things but that worked for me so thought I'd send it along. Good luck

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bob

02-09-2003 08:23:06




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 Re: Any more ideas for a stuck valve? in reply to Mike Schotte, 02-08-2003 18:07:02  
Start it and run it on three cylinders. After a few warm-up & cool down cycles it might help the valve come loose. Otherwise I think you'll be best served pulling the head and making sure that valve isn't bent. As others have said, the rope trick may do more harm than good if you don't get pressure applied to the center of the valve.



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LEE

02-09-2003 07:00:59




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 Re: Any more ideas for a stuck valve? in reply to Mike Schotte, 02-08-2003 18:07:02  
NOW THAT YOU HAVE THE VALVE DEPRESSED YOU MAY HAVE TO PULL HEAD, IF YOU CAN GET THE VALVE SPRING OFF AND INSTALL AN OLD DRILL CHUCK, SOAK IT WITH PENETRATING OIL AND TRY A SOCKET AND RATCHET TO TURN VALVE. DID THIS ONCE ON AN OLD CHEVY TRUCK ENGINE.



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Jim in Michigan

02-09-2003 06:23:25




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 Re: Any more ideas for a stuck valve? in reply to Mike Schotte, 02-08-2003 18:07:02  
Take the head off, do a valve job and put it back together...You should do a valve job on it now since it is stuck,,once they stick it seems like then they will stick again after sitting just a short time,,,Jim



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JERRY WHIPPLE

02-09-2003 04:21:14




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 Re: Any more ideas for a stuck valve? in reply to Mike Schotte, 02-08-2003 18:07:02  
Mike, Your picture shows that the studs are not blocked by the manifold . Then why not pull the head and manifold as a unit. If you think the valve is bent and want to check it, they make a tool to look inside the cylinder, great tool. Jerry



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Mike Schwartz

02-08-2003 22:47:28




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 Re: Any more ideas for a stuck valve? in reply to Mike Schotte, 02-08-2003 18:07:02  
Mike, I don't know how hard you had to tap on the valve to get it to go down, but if it went without to much trouble I have an idea that might work. On my F-30 I was able to get a pry bar under the valve spring and pry up on the valve. If you have been soaking it and you have gotten it to move down I think that you should be able to get it to come back up. I think that I read that you were just hoping to get the tractor running to check it out without putting much money into it, since you have the hood and the valve cover off pulling the head won't take very much more time. You can reuse the head gasket to run the engine after you free up the valve, just use Coppercoat spray on it before you put it back together. Good luck, Mike S.

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Mike Schotte

02-08-2003 23:21:26




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 Re: Re: Any more ideas for a stuck valve? in reply to Mike Schwartz, 02-08-2003 22:47:28  
Hi Mike,

Yes- you are correct... I am trying to start this one without pulling the head. It's not a restoration project, but it's not a "parts" tractor yet, either.

Two valves were originally stuck, but one has since popped back up and is now free.

I've been soaking these valves for about two months now.

I don't have any evidence to suggest that the stuck valve is bent- but the pushrod for that valve was bent when I pulled it out.

I had thought about prying on the valve spring- but I didn't want to pry against the machined surface of the valve cover seat.

It would be nice to devise some sort of slide hammer that could allow you to pull up evenly on it.

With regards to the gaskets- yes, I was trying to avoid a new $90.00 head gasket. I suppose it is possible to re-use the old one temporarily... but I would bet good money that the exhaust gaskets wouldn't survive me removing the manifold.

Thanks, -Schotte

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Nedd

02-11-2003 06:26:56




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 Re: Re: Re: Any more ideas for a stuck valve? in reply to Mike Schotte, 02-08-2003 23:21:26  
Had that problem on a DC and took a brand new vise grips with sharp corners and clamped onto the stem at the very top. Oiled the heck out of it and twisted it back up. Took a block of wood and pushed it down again. Then twisted it back up again. Tractor ran good for a year then that valve broke and went thruogh the piston. Hope you have better luck.



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611B-Andy

02-08-2003 19:43:29




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 Re: Any more ideas for a stuck valve? in reply to Mike Schotte, 02-08-2003 18:07:02  
Don't really like the rope idea as if you don't get the rope centered under the valve you will bend it.
If it were mine I would pull the head. I'm facing the same problem with a '29 Gravely tractor. There are NO parts available! I will use heat on the block/guide area[ very carefully] to expand the block and hope for the best as all mechanical tries haven't worked.
Don't know much about parts for the older Case's, if the valve is available, pull the head, tap the valve through. The stem may be damaged anyway. Good Luck

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Lew

02-08-2003 19:27:37




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 Re: Any more ideas for a stuck valve? in reply to Mike Schotte, 02-08-2003 18:07:02  
Have you tried squirting some solvent or penetrating oil on the valve stem? If it is stuck not bent it is probably held by some crud buildup and a solvent might loosen it.If there is any compression left in the spring, you could be sure the piston it at top dead center (in case the valve drops), then remove the keeper and spring and try to pry or pull it up by the now exposed stem. However if it is bent none of these stunts will work. In an engine that is running, I have freed stuck valves by slowly pouring auto tranny oil down the intake, Worked well on an old straight eight with three stuck valves. Exhaust manifold got very red before success was attained but it eventually did the job. Don't know if 3 of 4 cyclinders working would run well enough to do that trick.

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