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Duane R 
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Joined: 19 Oct 2023
Location: Alexis, IL
Points: 26
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 Topic: AC B project- valve cover
Posted: 19 Oct 2023 at 9:17pm |
Trying to rescue an Allis B tractor (1940 s/n 38660) with Woods L306 belly mower that’s been sitting in neighbors front yard for several years. Couldn’t stand to see it rot away Engine is froze tight. I’m trying to take the valve cover off. Took off the four nuts on top. Won’t move. What else am I missing? Operators and service manuals just say “remove the valve cover”. I can get a screw driver underneath it in the corners but something is holding it tight. Any ideas?
PS I took out the spark plugs and drain plug. Engine was completely full of water, took out 3-4 gallons from the cylinders, exhaust manifold, and oil pan. Guessing it came in through exhaust manifold. Am I wasting my time on this motor?
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KMAG
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Joined: 26 May 2020
Location: Elizabethtown,
Points: 669
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Posted: 19 Oct 2023 at 9:24pm |
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If you have winter freezes, that engine block is cracked.
So yes, time to look for another engine.
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Duane R
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Joined: 19 Oct 2023
Location: Alexis, IL
Points: 26
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Posted: 19 Oct 2023 at 9:32pm |
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Afraid your right. I’ll start looking. I hate when neglect destroys something so simple and cool like the B. ☹️. Thanks.
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Duane R
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Joined: 19 Oct 2023
Location: Alexis, IL
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Posted: 19 Oct 2023 at 9:36pm |
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Also, found your forum a month ago when I first thought about buying the tractor. I am impressed with all the knowledge you all share. Truly aces..
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Mikez
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Joined: 16 Jan 2013
Location: Usa
Points: 8380
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Posted: 19 Oct 2023 at 9:52pm |
Welcome to the forum. Try to find yourself an older original dealers parts book. Sometimes part numbers get changed over the years. Then figure out how to use the agco parts book’s website for the modern numbers. FYI the old allis chalmers numbers will most likely be six digits. Then in the mid 80s Deutz allis bought them they added 70 to beginning of part number and now agco. Then post on here there’s lots of us that have nos parts. Another fyi if you say wtb there’s a lot of computer generated scammers that will try to get you to email a friend that has what your looking for
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Alvin M
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Joined: 24 Jun 2018
Location: PA
Points: 764
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Posted: 20 Oct 2023 at 4:56am |
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There are 4 rubber packings under the washer that are tight
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AaronSEIA
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Joined: 11 Sep 2009
Location: Mt Pleasant, IA
Points: 2551
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Posted: 20 Oct 2023 at 5:49am |
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Nothing but friction is holding the valve cover down. I wouldn't call the block junk till you've completely torn it down. If you want to spend the money, the block itself may be good. Just needs a complete overhaul.
AaronSEIA
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Duane R
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Joined: 19 Oct 2023
Location: Alexis, IL
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Posted: 20 Oct 2023 at 6:14am |
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Bought operators, parts, and service manuals that are reprints of originals so that got me started since I’m a rookie at this. Good to know how the parts number changed over the years. No surprise since it struck me the tractor is 83 years old now!
So some careful pressure and lots of WD-40 should hopefully convince that valve cover to release.
Thanks!
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jaybmiller
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 22444
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Posted: 20 Oct 2023 at 6:22am |
use a sharp putty knife and go all way round the valve cover/head joint. last guy may have used a 'gasket sealer' in there. I did that on the forklift..never leaked after that ! I suspect the motor is now a 'treasure trove of parts' and I'd get another engine(heck whole tractor...) especially upgrade to one with starter.
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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WF owner
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Joined: 12 May 2013
Location: Bombay NY
Points: 4664
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Posted: 20 Oct 2023 at 6:35am |
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Spray some penetrating oil on the bolts.
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SteveM C/IL
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8235
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Posted: 20 Oct 2023 at 7:01am |
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If it's like my 45,the rubber seals under the nuts are squished in tight in the threads. If you can get it to unscrew from the stud it will get loose enough to remove.
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
Points: 81065
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Posted: 20 Oct 2023 at 8:34am |
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take a screw driver or packing knife and get the rubber washers off FIRST... then pry the cover off.
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Like them all, but love the "B"s.
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Steve in NJ
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Joined: 12 Sep 2009
Location: Andover, NJ
Points: 11788
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Posted: 20 Oct 2023 at 11:31am |
I'm wit' Jay on the sealer. Someone might have used RTV all the way around it to use the old gasket again. Those rubber washers really bite into the threads on those studs, so that might be your problem also. The engine in my B was full of water as well, but it was savable. I wouldn't condemn it till you got it apart and see what you have.... As long as there isn't a giant crack in the block, I would think its usable. Good luck, hope the engine is still good yet...... Steve@B&B
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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Duane R
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Joined: 19 Oct 2023
Location: Alexis, IL
Points: 26
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Posted: 20 Oct 2023 at 9:51pm |
Spot on. Soaked with WD-40. I used a jackknife to peel under the rubber packing that I couldn’t even see as it was crushed into the cover. Unscrewed the packing and the valve cover pops off. Hindsight showed me I didn’t look at the parts book close enough as it shows the washer and the packing. Need to learn the terminality better. Good news is the top of the head, springs, push rods, etc are clean with no rust. On to the next step…… Thanks for the help!
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