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Allis Chalmers Discussion Forum
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How do I free up a seized WD45

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Chuck Luedtke

08-02-2003 11:09:09




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I have a WD45 diesel that I am trying to fix up. I have the head etc. off of the motor, the radiator is out and the narrow front is off to access the crankshaft etc. Two of the six cylinders have some considerable rust in them both top and bottom, but the other four look like it ran yesterday. What is the safest way to free this engine up without breaking any major parts. I see that the diesel pistons and sleeve kits are rather expensive and would like to avoid that if at all possible. I ordered some Gibbs penetrating oil cause someone told me that was the "miracle stuff" but would like some other input so I can get this baby back to life. I don't have the starter to try and click her free. It is already in to be gone over. Thanks

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Mike

08-05-2003 20:01:14




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 Re: How do I free up a seized WD45 in reply to Chuck Luedtke, 08-02-2003 11:09:09  
I loosened up the rod bearings, then cleaned out the sleeves down to the piston with either a wire brush on a drill or a cylinder hone. Then applied brake fluid or diesel fuel on top of the pistons and let sit for a few days. Then back up the crank on one piston and, using a round oak block that fits the cylinder dia., I tap with a 20 oz hammer a few times. When it comes loose you can rock the crank back and forth till you can turn over . Have done this for many years on almost all brands of tractors and has worked very well, even on the very stubborn ones. Good luck

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JMS/MN

08-04-2003 09:34:05




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 Re: How do I free up a seized WD45 in reply to Chuck Luedtke, 08-02-2003 11:09:09  
Just finished a '37 WC that rusted tight. After months of soaking in various products, I took off the oil pan and head, disconnected the rods from the crank, and pushed each piston up through the block using a hydraulic jack. Also used a 3/4 inch rod as an extension to push on the boss of the piston pin- not the piston head. Made a jack attachment with a curved top (pipe) to push atgainst the connecting rod. Needed a skidloader bucket filled with sand, resting on top of the tractor frame to hold the tractor down on the tightest piston. Honed the cylinders and put new rings in- works fine now.

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Chuck Luedtke

08-04-2003 19:15:45




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 Re: Re: How do I free up a seized WD45 in reply to JMS/MN, 08-04-2003 09:34:05  
My dad just gave me a similar idea to what you are talking about. Were any of the sleeves pitted at all from the rust, or was it just surface rust. I have one with a little pit in the side of the piston sleeve and am hoping to get by without new sleeve and piston cause one cylinder will set me back $200.00 Thanks for the ideas.



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JMS/MN

08-06-2003 23:25:48




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 Re: Re: Re: How do I free up a seized WD45 in reply to Chuck Luedtke, 08-04-2003 19:15:45  
Was just surface rust- gained from a 4" downpour during a parade when the tractor was on a trailer, not running. One sleeve and piston should not be $200- You can replace all 4 cyl rings for under $100. Check with a salvage yard for a used cyl/piston if the few pits worry you- is this a parade or use tractor?



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Dave K

08-03-2003 10:11:24




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 Re: How do I free up a seized WD45 in reply to Chuck Luedtke, 08-02-2003 11:09:09  
Pulling is the way to cause the most damage, rocking is not much better. You may have frozen valves and it's a sure way to bend or break something. Soak in diesel fuel and penatrent and work them loose by turning the crank pully with a wrench or whatever. Check all valve components also as water getting in the exhaust can bind them up.

Dave



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Morgan

08-03-2003 10:56:42




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 Re: Re: How do I free up a seized WD45 in reply to Dave K, 08-03-2003 10:11:24  
You better re-read the original message because he said he had the head off. I learned my method right here on this message board and I stand by it. It has worked for over 30 tractors that I have owned and they are all out in the field right now working.



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Morgan

08-02-2003 16:57:04




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 Re: How do I free up a seized WD45 in reply to Chuck Luedtke, 08-02-2003 11:09:09  
Hello, I once owned a WD a couple of years ago that was stuck. The best way I have found to break them free is, if you haven't disconnected the piston rods from the crankshaft, jack up one rear tire, put the transmission in the fastest gear and rock the tire back and forth. Also, what I do is take an old cylinder hone and clean the cylinders that are rusty up to the top of the pistons so I don't damage the cylinder walls when it comes free. Make sure you have plenty of penetrating oil in all six cylinders to help it along. On my WD, I tried dragging it to break it free and it did not work. I read about jacking one wheel up and tried it and it freed it up quickly. I have seen people use their starter to try and free up a stuck engine and all they ended up doing was shear the teeth off the flywheel or the starter drive.

Try the rear wheel method. It might take a few days but it works and it is the safest way. Make sure you block up the tire that you are not jacking up.

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Gene

08-02-2003 17:08:16




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 Re: Re: How do I free up a seized WD45 in reply to Morgan, 08-02-2003 16:57:04  
I use a die grinder with a cone shaped fine wire brush and go over the cylinder walls of the stuck pistons and polish the wall up then blow all the junk out and use the devil out of diesel and marvel mystery oil. I don't like to pull or rock a engine as some times you can damage the piston ring lands and it will cost you more for a piston.



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