Pulled the head on my WD
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=23920
Printed Date: 17 May 2024 at 5:44am
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Topic: Pulled the head on my WD
Posted By: redline
Subject: Pulled the head on my WD
Date Posted: 11 Jan 2011 at 10:40pm
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I think I have a pretty good idea where the compression went on #4. The cylinder sleeve looks good yet, but the head and #4 piston took a pretty good beating. I have an extra rod to use, as I would think the original might not be trustworthy any more after absorbing such a shock, but I don't have an extra oversize piston to use. I am hoping to fix this up inexpensively-not because I have to, just because it is a challenge.
What do you suppose the chances are of saving this cylinder head? It took quite a beating. Is it worth taking in for magnafluxing?
Don't scold me for damaging a tractor this way, this is how I bought it!
    ------------- If it weren't for the last minute, I wouldn't get anything done! |
Replies:
Posted By: Bob D. (La)
Date Posted: 12 Jan 2011 at 5:21am
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Ouch!!! Momma, he hit me and broke my valve. Now I've got a runny nose. Hope you find the parts to put it together like you want.Think I remember someone advertizing some pistons or maybe piston and liner within the last month or so. God Bless. ------------- When you find yourself in a hole,PUT DOWN THE SHOVEL!!! |
Posted By: Steve M C/IL
Date Posted: 12 Jan 2011 at 6:32am
| Head is likely ok but magnaflux would be smart.I'd replace the other valve too.all the pounding might have lowered it 's integrity . |
Posted By: Ted J
Date Posted: 12 Jan 2011 at 7:46am
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I wonder how it got that way??
------------- "Allis-Express" 19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17 |
Posted By: redline
Date Posted: 12 Jan 2011 at 7:55am
my theory is it was started with a sticking valve, and the piston and exhaust valve were introduced in a rough manner. I am no expert, but it seems to me that could weaken the stem and also get it started flexing each time it closed. Probably could only flex about "x" number of times 'til the head popped off. The valve head was discovered in the bottom of the oil pan along with some aluminum chunks.
That to have been a horrible racket when it let go.
  ------------- If it weren't for the last minute, I wouldn't get anything done! |
Posted By: JC-WI
Date Posted: 12 Jan 2011 at 9:31am
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Did some one try to get rid of the miss with new sparkplugs?
Think if you plane the head, it will look a lot better, Oh crap, , looks like it's got harden ex. valve seat inserts. If I remember right, they have to be removed and recut when the head is planed... Oh, thats right, you going to do it as cheap as you can. Well then just grab a file and run over that area just to file off any metal protruding. And replace intake fale while at it.
Second thing is, look your piston over and see who made it or any numbers. You should check the weight of them pistons to make sure they all weigh the same. You don't want more vibes than what it had before. ... Whats with that offset circle ontop of the piston, does the others have that too?
By the way, that hole in the piston was on of those unexpected decompression releasers. lol
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Posted By: DaveKamp
Date Posted: 12 Jan 2011 at 1:34pm
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Hmmm... yeah, that's some interesting heiroglyphics that the valve fragments left in the top of that piston. Good thing it was a dished piston to begin with... otherwise, it'd probably be a whole lot worse. Check the sleeve really good, just in case that valve wedged in there enough to swell out the piston and open a slight crack in the sleeve. From a low-budget repair challenge perspective, think I'd check the mains closely, look for bent rods on the other three cylinders, and of course the crank... but don't think it'd be necessary to yank the engine or crank... if the rod's okay, I'd say stick a used piston and sleeve in, scrub the head, inspect, mebbie magnaflux it, put in a used valve, lap it, a different spring, reassemble and fire it up... and listen for odd noises (which is always a challenge in old engines). I'll bet that old girl will go back to business as usual. |
Posted By: FHOliver
Date Posted: 12 Jan 2011 at 2:19pm
| keep us posted how you make out, nice to get that old girl purring again. She didnt deserve that whipping !! |
Posted By: Gerald J.
Date Posted: 12 Jan 2011 at 4:28pm
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I popped the head off a sodium filled valve in a VW once. It locked up the engine with the head of the valve on edge in a new slot it the top of the piston. It was an aluminum head too, so I replaced head, valves, pistons and cylinders, ended up with a bigger bore kit. I think what did it was that on a previous valve job, I'd replaced the original aluminum bronze valve guides with steel to get a longer wear life, but the steel didn't stay in good contact with the aluminum head when it expanded and so the valve overheated. I wan't pushing it hard when it broke, but there was a brrrrp and no more engine power. Probably just a few revolutions. Having free sodium metal running around makes taking that engine part rather interesting as bits of metal ignite from moisture or the heat of the torch expanding the piston to get the piston pin out. Gerald J. |
Posted By: mlpankey
Date Posted: 12 Jan 2011 at 4:36pm
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Is it a dished piston or just a busted piston? send me that head I will install some new 5/16 bronze guides and valves with some port work for a fee. ------------- people if they don't already know it you can't tell them. quote yogi berra |
Posted By: Bob(FL)
Date Posted: 12 Jan 2011 at 4:56pm
| Mitch, I think you left the r out of free. |
Posted By: mlpankey
Date Posted: 12 Jan 2011 at 4:58pm
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nope ------------- people if they don't already know it you can't tell them. quote yogi berra |
Posted By: Lonn
Date Posted: 12 Jan 2011 at 6:11pm
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Guys, some of you are seeing an optical illusion. The piston is not dished and does not have an offset circle on top. It's the piston at the bottom of the cylinder with the shiny walls giving you the illusion. Just had to point that out otherwise all good advise. ------------- -- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... - Wink I am a Russian Bot |
Posted By: redline
Date Posted: 12 Jan 2011 at 9:43pm
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I appreciate all of the input on this. I have decided to use a set of standard sleeves and pistons in this unit that I found on ebay a while back. I know, it isn't as cheap as I originally intended, but finding a good used oversize piston that matched could be a problem. I think I will dress up the head and install good valves on #4 and then take a look at the head. I might take it to a machine shop yet. It was fun to think about being frugal, but I just might want to depend on this tractor sometime. Thanks again, I will keep you all posted on my progress. ------------- If it weren't for the last minute, I wouldn't get anything done! |