stuck motor

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r doud
40C crawler
40C crawler
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Joined: Tue Nov 17, 2020 9:41 pm

stuck motor

Post by r doud » Fri Nov 27, 2020 9:40 pm

what is the best way get a jd 40 motor unstuck. also tractor will not roll. put blaster every where i can think . it is a jd 40 i think, has 5 rollers. i take it back.model is 420 c serial 93177thanks Bob

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gregjo1948
350 crawler
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Location: Newark Valley,NY,USA

Re: stuck motor

Post by gregjo1948 » Sat Nov 28, 2020 4:25 am

After soaking the cylinders with PB blaster and the engine won't break loose using the starter, I feel the best way is to tear it down. After removing the crank, I use a block of wood to drive the pistons down and out. Clean the cylinders, piston, and etc.
Do the appropriate measurements and get the parts needed from Lavoy.
JD 350B diesel 6way blade, Case 580B Loader/backhoe, Farmall 504 high crop w/ flail boom mower, International 404 , International 284 diesel w/belly mower, 1972 Ford F600 dump truck, Galion 3-5 roller, Allis Chalmers D17, 1620 Ford

B Town
350 crawler
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Location: Western Iowa

Re: stuck motor

Post by B Town » Sat Nov 28, 2020 6:49 am

I agree with grego1948.

Here is an interesting alternative (5th post by JAJ)

viewtopic.php?f=1&t=13590

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E.Huffman
440 crawler
440 crawler
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Joined: Sat Nov 14, 2020 6:33 pm
Location: Dayton OH

Re: stuck motor

Post by E.Huffman » Sat Nov 28, 2020 7:56 am

On the 1958 420u we restored we let automatic transmission fluid set on the pistons and also penetrating oil.and from there it went real slow. Are you wanting to save the pistons to use or are you going to replace them?

r doud
40C crawler
40C crawler
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Re: stuck motor

Post by r doud » Sun Nov 29, 2020 7:38 pm

i would like to save the pistons.

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E.Huffman
440 crawler
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Re: stuck motor

Post by E.Huffman » Mon Nov 30, 2020 8:45 am

We used a block of wood and a hammer to try to knock it out with penetrating oil in it still. I have heard coke will do the trick due to the acid that is in it as well... :)

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Paul Buhler
350 crawler
350 crawler
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Joined: Wed May 21, 2008 6:25 pm
Location: Killington, VT

Re: stuck motor

Post by Paul Buhler » Mon Nov 30, 2020 4:16 pm

I agree with Greg too. This engine is small, and can be removed relatively easily. When I’ve dealt with stuck engines, unless they are an easy unstick, the rings,cylinders, and bearings, etc, become suspect. By doing a tear down, these parts can be inspected and repaired/replaced giving confidence that the machine will run more reliably. When I’ve short cut the process, I’ve had subsequent engine problems, usually at the most inopportune time.
I still tend to take the most cost effective approach as I see it at the time, meaning that I don’t do “with new” replacements unless absolutely necessary (rings, seals, and bearings usually the exceptions). Good luck.
Last edited by Paul Buhler on Tue Dec 01, 2020 5:54 pm, edited 2 times in total.
Paul Buhler
Killington, VT
420c 5 roll with 62 blade, FOPS, and Gearmatic 8a winch

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gregjo1948
350 crawler
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Re: stuck motor

Post by gregjo1948 » Tue Dec 01, 2020 3:13 am

If the engine won't break free after soaking with penetrating fluid and trying to crank it over with the starter, force is needed. Using force, like a block of wood, will usually break it free but, the key word there is break. You can damage the top of the piston and, more likely, break the lans and/or the rings. There could also be cylinder damage. Therefore, if it comes to beating on it, you should go all the way and remove the pistons to do a proper rebuild. After all, it's easy to remove the engine and it's only two little cylinders. Lavoy can probably supply the needed parts and maybe give you the needed specs.
JD 350B diesel 6way blade, Case 580B Loader/backhoe, Farmall 504 high crop w/ flail boom mower, International 404 , International 284 diesel w/belly mower, 1972 Ford F600 dump truck, Galion 3-5 roller, Allis Chalmers D17, 1620 Ford

r doud
40C crawler
40C crawler
Posts: 12
Joined: Tue Nov 17, 2020 9:41 pm

Re: stuck motor

Post by r doud » Sun Dec 06, 2020 10:38 pm

i might take a spark plug and knock the insulator off, weld a washer on ,thread it for a zerk fitting and hydraulic the piston down. once it moves i can get it to roll over.

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gregjo1948
350 crawler
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Re: stuck motor

Post by gregjo1948 » Mon Dec 07, 2020 3:29 am

Don't forget by forcing the grease into the cylinder, you're putting pressure in all directions in there and could force something to give(move) that you don't want to.
JD 350B diesel 6way blade, Case 580B Loader/backhoe, Farmall 504 high crop w/ flail boom mower, International 404 , International 284 diesel w/belly mower, 1972 Ford F600 dump truck, Galion 3-5 roller, Allis Chalmers D17, 1620 Ford

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Lavoy
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Re: stuck motor

Post by Lavoy » Mon Dec 07, 2020 9:35 am

I would echo what Greg said. A grease gun at 4000-10,000 psi WILL bend a rod, break in the cylinder wall, break the head, or other possibilities that cost money.
Lavoy
Parts and restoration for antique and late model John Deere crawlers.
Owner and moderator www.jdcrawlers.com

dtoots1
350 crawler
350 crawler
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Location: akron, ohio

Re: stuck motor

Post by dtoots1 » Mon Dec 07, 2020 2:33 pm

where are you at with the engine? have you taken any of it apart/?

also where are you located, it helps if you put a location in your profile...click on the login drop down box and then click on profile and add location...

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Stan Disbrow
350 crawler
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Re: stuck motor

Post by Stan Disbrow » Tue Dec 08, 2020 5:33 am

Hi,

When the pistons are truly stuck, bust out their tops and yank them out upwards using a Ford Model A hub puller bolted to the top of the block. It's the cast iron oil rings rust welded to the bores. They come out a lot easier up than down. Been there, done that.

Stan
There's No Such Thing As A Cheap Crawler!

Useta Have: '58 JD 420c 5-roller w/62 inside blade
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dtoots1
350 crawler
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Re: stuck motor

Post by dtoots1 » Mon Dec 14, 2020 10:02 am

am curious ...where are you at with this engine? I had my 2 cyl engine stuck and got it done..easily,(it had set for 15-20 years) tho had pb blaster an miracle oil setting for at least 6 months in the cyl....only one usually gets stuck...that would be the front cylinder....pull oil pan and loosen bearing cap enough to try to turn crank a bit to determine just which one is frozen....advise results and will get back to you and put your location in your profile...located in the login drop down box...someone may be nearby to help

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