Allis Chalmers WD Valve Seats
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=200744
Printed Date: 30 Nov 2024 at 11:23pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Allis Chalmers WD Valve Seats
Posted By: ForgivenCreation
Subject: Allis Chalmers WD Valve Seats
Date Posted: 05 Apr 2024 at 9:36pm
| This may sound strange but did the engine in my 1949 Allis Chalmers WD have valves seats? Was the head itself the valve seat? Got an exhaust valve that the seat is almost nonexistent. |
Replies:
Posted By: DrAllis
Date Posted: 05 Apr 2024 at 9:44pm
| Exhaust valves replaceable steel seats. Intake seats are ground into the head casting. |
Posted By: ForgivenCreation
Date Posted: 05 Apr 2024 at 10:55pm
Are the exhaust valves seats for the WD known for being eaten away? I have one that is super super bad. All the others are normal. Does this one need to be pulled out and replaced or can it be fixed.
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Posted By: DrAllis
Date Posted: 06 Apr 2024 at 6:46am
| Looks to me like an engine that has sat outside for 40 years without a rain cap on it and valve open. I doubt that it will grind smooth but you'll never know until you try. |
Posted By: Fred in Pa
Date Posted: 06 Apr 2024 at 8:04am
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Machine Shop can install seats , ------------- He who dies with the most toys is, nonetheless ,still dead. If all else fails ,Read all that is PRINTED. |
Posted By: ForgivenCreation
Date Posted: 06 Apr 2024 at 12:57pm
| Do any of yall have the spec for the exhaust seat face? |
Posted By: DrAllis
Date Posted: 06 Apr 2024 at 5:38pm
| Seat face width of 1/16" (.0625") |
Posted By: ForgivenCreation
Date Posted: 06 Apr 2024 at 6:42pm
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Alright got the old valve seat out! VERY VERY carefully used a dremel and made one spot really thin then used a flat punch with a lip ground in it as a lever on the inside edge of the seat and a hammer. Took some hits and a bit of heat but got it out! Also does anyone have the part number for the Exhaust valve seat? The hole OD measures 1.5615" Also Thank ya for the spec!  
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Posted By: SteveM C/IL
Date Posted: 06 Apr 2024 at 11:02pm
| A couple 3 spots of weld on the ID will shrink em to make removal easier. |
Posted By: Mikez
Date Posted: 06 Apr 2024 at 11:29pm
| Think we could help you with some nos seats. If your interested |
Posted By: tractorboy
Date Posted: 07 Apr 2024 at 1:54am
| That's a good start ! I used the dremal tool trick last year on a ford Y-block, then slightly heated head pocket & used a correct size bearing tool to tap the new one in. I had the new one in the freezer for a day. Good Luck, keith so.va. |
Posted By: ForgivenCreation
Date Posted: 07 Apr 2024 at 6:01pm
| Well for the life of me I can't find the exhaust valve seat. I can find them but they do not measure correct. Does anyone have the Part Number? |
Posted By: Mikez
Date Posted: 07 Apr 2024 at 6:10pm
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It’s number 26. Those are old numbers. New number is 241538 
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Posted By: Mikez
Date Posted: 07 Apr 2024 at 6:12pm
| I’d have to look but I think we have both |
Posted By: Mikez
Date Posted: 07 Apr 2024 at 6:14pm
| Oh and add 70 to beginning of those numbers when your dealing with agco |
Posted By: ForgivenCreation
Date Posted: 07 Apr 2024 at 7:02pm
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Cool, thank you!!! If you do end up having some let me know! |
Posted By: SteveM C/IL
Date Posted: 09 Apr 2024 at 10:24pm
| I think they require some punch work around them to "secure" them. An old service manual would say. |
Posted By: ForgivenCreation
Date Posted: 10 Apr 2024 at 1:48pm
| If a valve seat is to tall/depth can it be sanded down to the proper height? |
Posted By: Fred in Pa
Date Posted: 10 Apr 2024 at 3:33pm
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Hardened valve seats , your not going to get no where with sand paper . Sounds like you should just take to a good machine and do the head correctly . ------------- He who dies with the most toys is, nonetheless ,still dead. If all else fails ,Read all that is PRINTED. |
Posted By: ForgivenCreation
Date Posted: 10 Apr 2024 at 3:42pm
| After consulting a family member the operation is to take the correct sized valve seat grinding stone flip it upside down and grind the top of the seat down once installed I believe. |
Posted By: SteveM C/IL
Date Posted: 10 Apr 2024 at 6:41pm
| They are made in different thicknesses. You sure you have the correct one? |
Posted By: ForgivenCreation
Date Posted: 10 Apr 2024 at 8:23pm
| Yeah, there seem to be only two sizes a standard and oversized. The standard is the right OD but wrong depth and the oversize is the right depth but wrong OD. |
Posted By: ForgivenCreation
Date Posted: 23 Apr 2024 at 6:01pm
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Well yall, it was a success!!! I had to take about an 1/8" off the top once I got the seat in. With the seat froze in the freezer and the head at outside Temps the clearance was .015 took a couple taps to get it in. The stone was going to slow. To get the material off faster I used a 40 grit sanding pad, then the fine stone to true it back up and then cut the sealing face in. Still might stake it in. I did leave it sticking up off the surface of the head about .020 figured that would be ok.   
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