Stuck valve on WC: Fix without pulling head?
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=127288
Printed Date: 23 Sep 2025 at 3:34am
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Topic: Stuck valve on WC: Fix without pulling head?
Posted By: nowaktj
Subject: Stuck valve on WC: Fix without pulling head?
Date Posted: 15 Aug 2016 at 6:28pm
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You guys out here are pretty creative... what is a good way of unsticking exhaust valve without pulling the head? I have tried sneaking pry bars in to lift up on the rotor to no avail. It is a number 2 cylinder. I do have the tool to pull Keepers without pulling the head. ------------- D19D, D17D, WD, WC, Snobee, #83 Plow, SC Blade, 14' disk, 400 series planter, B , Terra Tiger, M Dozer w/Baker Blade, TL-12, 42S Grader, G |
Replies:
Posted By: CrestonM
Date Posted: 15 Aug 2016 at 6:33pm
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Is it stuck open or closed?
I've heard of guys who pull the valve cover, then hit the valve stem with a hammer, and that freed it up.
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Posted By: nowaktj
Date Posted: 15 Aug 2016 at 6:35pm
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It is stuck open. It seems to be stuck hard. I wonder if it is bent. ------------- D19D, D17D, WD, WC, Snobee, #83 Plow, SC Blade, 14' disk, 400 series planter, B , Terra Tiger, M Dozer w/Baker Blade, TL-12, 42S Grader, G |
Posted By: j.w.freck
Date Posted: 15 Aug 2016 at 6:36pm
| you might do what we did with the big radial aircraft engines(2800 and the 3350).called staking the valves.remove the rocker amr,lube the valve stem with croil and tap the valve with a rubber mallet or a wood hammer..... |
Posted By: Lon(MN)
Date Posted: 15 Aug 2016 at 6:54pm
| Grind the spring off and try to turn the valve with a vise grip. |
Posted By: LeonR2013
Date Posted: 15 Aug 2016 at 7:12pm
| Take the tool you have and remove the keepers and spring. Then put some paint thinner in a squirt bottle and shoot some thinner on the stem and tap it with a piece of wood. You might put some tape around the very top of the valve so it doesn't fall down on the piston. As suggested Kroil is really good penetrant to loosen things up too. |
Posted By: LeonR2013
Date Posted: 15 Aug 2016 at 7:12pm
Posted By: WDDave
Date Posted: 15 Aug 2016 at 7:13pm
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Might do more harm than good if it wont move with pry bars or vise grips. Any more than that you might damage the head if it is bent like you suspect. Might be more work but better and maybe cheaper in the long run to pull the head. ------------- WD ,wide front, with loader |
Posted By: Dick L
Date Posted: 15 Aug 2016 at 7:44pm
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Once you pull the head and do a proper repair of the problem you will have lost the fear of removing heads on your tractor. Takes a couple new gaskets and maybe a valve and guide. Might just be a cleaning of the guide and stem. Guessing can go on for ever. Even if you free it up you will still wonder why it stuck in the first place and will it do it again soon. If you would get it freed up to where it opened and closed and it didn't seat properly it would then burn the valve as well as the seat. Ya gotta love me now.
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Posted By: desertjoe
Date Posted: 15 Aug 2016 at 9:26pm
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Yep,,Yep,,,you just gotta love a guy like ole Dick Lemmon,,,,,  always got some good suggestions with tongue in cheek,,,,,,There IS one other suggestion,,,get you an old spark plug, break off the porcellin and weld a 1/4" quick coupler on the spark plug. Remove all the spark plugs and install your new "tool" into the cylinder with stuck valve. Make sure tractor is in neutral,,!!! .Remove valve cover and Hook your air hose onto the coupler. tapping on valve while air pressure is on cylinder "might" start moving the valve to the closed position. This should work to free valve unless,,,,,valve is bent,,in which case you are money ahead to pull head, cause you will ruin the valve guide tryin to force it outa there,,,,Hope this helps,,,, |
Posted By: dawntreader74
Date Posted: 15 Aug 2016 at 10:55pm
Posted By: dawntreader74
Date Posted: 15 Aug 2016 at 11:02pm
| take spark plug out turn piston down push around to feet of small rope in cyl' turn motor wear piston goes up should push valve up' lube it thin you can work it up or down pull rope out try it' worked for me lot's of times |
Posted By: Steve in NJ
Date Posted: 16 Aug 2016 at 6:48am
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If its just stuck from sitting and not bent, the Kroil down the valve and the rubber hammer idea should work. I've used that technic many times over the years on Antique cars that had stuck valves. In most cases, once the penetrant gets down in the guide and loosens the varnish, the tapping at the top of the valve usually will pop it up. Keep the pry bars outta' there. They do damage. If the valve doesn't come up after some fussin' with it, it could be bent. Then its time to pick up a head set, remove the head and get the whole thing checked out at the machine shop... Good Luck! Steve@B&B ------------- 39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife |
Posted By: SteveM C/IL
Date Posted: 16 Aug 2016 at 10:00am
| What is the likelihood its bent? I'd say little.What would be the cause?Soak and tap. |
Posted By: CTuckerNWIL
Date Posted: 16 Aug 2016 at 10:08am
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Had a neighbor that had a valve hang up on his lawn tractor. He juiced it up, did some monkeyin around and got it free, for a while. Every time it sat for any amount of time he seemed to have the same problem. A monthly ritual could have been ended with way less time and trouble by fixing the problem in the first place.
------------- http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
Posted By: Fred in Pa
Date Posted: 16 Aug 2016 at 11:58am
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Pull the manifold and look at stem. Do not put anything in the cyc. Piston can not hit valve to bend it with stock piston. ------------- He who dies with the most toys is, nonetheless ,still dead. If all else fails ,Read all that is PRINTED. |
Posted By: j.w.freck
Date Posted: 16 Aug 2016 at 7:28pm
| pull the damn head off and see what you are up aginst for certain.it is no earth shattering deal to pull the head.guessing and all the variables wont cut the mustard..... |
Posted By: Orange Blood
Date Posted: 16 Aug 2016 at 8:15pm
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It takes about 1 minute of fooling around to make the problem 1000 times worse, and much more expensive. It takes about 20 minutes to remove the head, once the coolant is drained, and you can repair it correctly, and it will last. May cost a bit more, but it won't stick again, if you keep it dry. ------------- Still in use: HD7 WC C CA WD 2-WD45 WD45LP WD45D D14 3-D17 D17LP 2-D19D D19LP 190XTD 190XTLP 720 D21 220 7020 7030 7040 7045 3-7060 Projects: 3-U UC 2-G 2-B 2-C CA 7-WC RC WDLP WF D14 D21 210 7045 N7 |
Posted By: j.w.freck
Date Posted: 16 Aug 2016 at 8:33pm
| I believe we solved the problem,orangeblood,sure is better than swolling a valve ,busting a rod,ruinening a head or a sleeve or possibly busting a crankshafh..... |
Posted By: Orange Blood
Date Posted: 17 Aug 2016 at 7:48am
I am not sure I follow what you are tying to say....... Are you saying, Shut Up OB, we got this handled, or are you agreeing with me. ------------- Still in use: HD7 WC C CA WD 2-WD45 WD45LP WD45D D14 3-D17 D17LP 2-D19D D19LP 190XTD 190XTLP 720 D21 220 7020 7030 7040 7045 3-7060 Projects: 3-U UC 2-G 2-B 2-C CA 7-WC RC WDLP WF D14 D21 210 7045 N7 |
j.w.freck wrote:Posted By: desertjoe
Date Posted: 17 Aug 2016 at 8:18am
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Now,,,now,,,Anthony,,,,,,,,, |
Posted By: Fred in Pa
Date Posted: 17 Aug 2016 at 8:22am
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AMAZING ------------- He who dies with the most toys is, nonetheless ,still dead. If all else fails ,Read all that is PRINTED. |
Posted By: Dick L
Date Posted: 17 Aug 2016 at 8:42am
The first wise guy don't have a chance! 
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Posted By: nowaktj
Date Posted: 22 Aug 2016 at 12:03pm
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I finally pulled the head and the root cause was that the valve was simply stuck from sitting (tractor was sitting inside a dirt floor machine shed for ~3 yrs). Without seeing this myself, I wouldn't have believed it how tight that vavle was. Little more background...the engine was a donor that had appeared to have been rebuilt recently so the guides were maybe tighter than something with 2000 hrs on it. I also thing the rope trick would have worked. ------------- D19D, D17D, WD, WC, Snobee, #83 Plow, SC Blade, 14' disk, 400 series planter, B , Terra Tiger, M Dozer w/Baker Blade, TL-12, 42S Grader, G |
Posted By: Dick L
Date Posted: 22 Aug 2016 at 2:51pm
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The rope trick might have worked! Pulling the head did work though. What might have gone wrong didn't. No sleepless night over this now. Good job!
I could write a book on the short cuts I have taken over my life time that went wrong. That of course would depend on my learning to read and write. Or is it reed an rite!
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