Freeing a Valve?
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=149425
Printed Date: 01 Apr 2026 at 3:59am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Freeing a Valve?
Posted By: CrestonM
Subject: Freeing a Valve?
Date Posted: 12 Apr 2018 at 10:44pm
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A friend of mine is working on an engine with an intake valve that is stuck open. What are some good things to try to get it unstuck without pulling the head? Thanks! |
Replies:
Posted By: Clay
Date Posted: 12 Apr 2018 at 11:07pm
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Have you tried the rope trick? |
Posted By: Clay
Date Posted: 12 Apr 2018 at 11:20pm
| http://https://video.search.yahoo.com/search/video?fr=tightropetb&p=stuck+valve+rope+trick#id=3&vid=a093bf13f8c6eb74e7829c445e9277ec&action=click" rel="nofollow - https://video.search.yahoo.com/search/video?fr=tightropetb&p=stuck+valve+rope+trick#id=3&vid=a093bf13f8c6eb74e7829c445e9277ec&action=click |
Posted By: CrestonM
Date Posted: 13 Apr 2018 at 12:11am
| Thanks! That's a good idea! I'd heard that before but forgot about it until now. I'll tell him! |
Posted By: DiyDave
Date Posted: 13 Apr 2018 at 4:46am
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here's the oz version... [TUBE]-ZQRqyTjuPc[/TUBE]
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Posted By: Nathan (SD)
Date Posted: 13 Apr 2018 at 8:26am
| Tap on it with a hammer. Sometimes the spring will lift it back to pre tap position. Continued tapping loosens them up eventually. Have done it twice over the years. |
Posted By: Allis dave
Date Posted: 13 Apr 2018 at 11:14am
| and generously oiled |
Posted By: Clay
Date Posted: 14 Apr 2018 at 12:08pm
| Kroil is the oil I have had the most success with, in these situations. Spray it on. Go have lunch. Give it a gentle tap when you get back to work. |
Posted By: R.W
Date Posted: 14 Apr 2018 at 2:39pm
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Oil and tap on it like others have said is what I've done a couple times. ------------- In Search Of: 1958 Allis Chalmers D17 Diesel serial #9643D |
Posted By: ALLISMAN32
Date Posted: 14 Apr 2018 at 8:00pm
| What make is the engine Creston? |
Posted By: CrestonM
Date Posted: 14 Apr 2018 at 11:18pm
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It's a Deere engine in a 55 combine. I'll tell the guy these tips and hopefully he'll get it unstuck! Combine only sat a year in a barn, so I'm kinda surprised it stuck after that short amount of time.
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Posted By: shameless dude
Date Posted: 15 Apr 2018 at 8:56am
| git a rope |
Posted By: Dick L
Date Posted: 15 Apr 2018 at 9:08am
| If something has not caused the valve stem to be bent I have had good luck placing a block as tall as the other valve stems beside the stuck down valve. Then use a screwdriver under the top of the spring and pry up as I tap on the top of the stem after removing the rocker arm first. With that short of time I might take a chance on light tapping on the rocker arm. If the stem goes down when tapping and there are no space in the spring and it stays down I would be a big fan in removing the head. If the engine was running rough when shut down the last time I would remove the head. On a 55 I would guess the engine has substantial wear in the guides unless recently overhauled. If it stuck from a burned valve and carbon has gone up a worn guide I would worry about the valve head striking the piston. The history of the engine would be helpful to the owner in making a decision on how to proceed if the valve does not free up easy. |
Posted By: Gerald J.
Date Posted: 15 Apr 2018 at 10:39am
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I'd be concerned about the valve seat and head being rusty if the valve stem is rusted in the valve guide. Then tapping on the valve stem could move the valve guide out of place and the valve seat may not let the valve close. I think its time to pull the head and do a complete valve job grinding all the valves and making sure the valve guides, valve springs, and keepers are all in good shape. Gerald J. |
Posted By: CrestonM
Date Posted: 15 Apr 2018 at 4:17pm
Hey, it ain't mine! I've tried preaching the Gleaner Gospel, but so far it ain't worked...too much green kool-aid I guess...
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shameless dude wrote: