JD 450G engine froze

[byro01]

I am new to this forum and have a few questions. I am trying to get a JD 450G crawler with a front end loader going for a friend and seem to be having a time getting the engine unstuck. It has been sitting a couple of years but ran great before parked. I remove the hyraulic pump, belt, removed valve cover and made sure none of the valves were stuck, and removed the injector lines and tried to get some oil down in the cylinders. It still will not turn. I tried removing the flywheel and getting a prybar on the flywheel but no good angle to do this with the frame in the way. Anyone have any other ideas??? Also, if you were to pull this machine without it running is it geared so that when the tracks turn it should turn the engine over? Thanks for any advice
The engine is a john deere diesel, I believe the model was M-53

[mini kahuna]

stuck engines are not fun,penatrating oil down the cylinders,hope to get it to break loose.

I don't want to break your spirit but I have never gotten a stuck engine to run right...got a couple to break loose but ended up taking them apart because of the cylinders being so pitted.

[JD450loader]

I just recently delt with this over the winter with a machine i bought unseen, it was delivered put a new battery in and new starter and clunk is all i got. pulled the injectors and injection rail out and PB blaster poured out of the head, so i next removed the head to find the froze motor. If you are able to get it free like the previous member posted you will have lots of problems, such as spun rod or main bearing, little to no compression,broke piston ring etc. if you get my drift. Is there water in the motor oil? If so i would take the head off and see how bad your cylinders look and go from there. If you tear down now you can salvage crank , cam, head, and rods more than likely. Then you could do a in frame rebuild kit aftermarket and carry on. thats my 2cents

[MarkW]

All the previous posters bring up valid points.

Having said that, if the motor is truly only stuck because it was sitting for a while, and was running fine when it was turned off then probably what has happened is moisture entered through the exhaust and into the cylinder that has the open exhaust valve. This will be the stuck cylinder, and your time is best spent focusing on this particular cylinder and not the others.

As mentioned, put some oil and diesel in all the cylinders through the injector ports. Then remove the valve cover and back off the exhaust valve clearance until the you the valve closed.

Now fire up your lathe or find someone with one and make up a fitting to go into the injector port that has a grease nipple on it, fill the cylinder absolutely full with oil, install the fitting and use a grease gun to break the engine free.

As mentioned, if there is any significant water in there you;ll get into another completely different can of worms but you caqn cross that bridge when you get the engine unstuck and fired up.

[digitup2]

Another idea that the king of obsolete did and I have tried is to get an old starter for that model engine and weld a sturdy turning handle on the input shaft to the starter Bendix.This worked great for me but was only a 353 Detroit that had sat for twelve years.I don't know if he still shows it on the web site or not .Digitup.

[byro01]

Thanks for all of the advice. I took the valve cover off and pryed the valves open and tried to get some transmission fluid to seep through the valve guides. The motor was not long overhauled before it was parked, so as someone mentioned I think it is mostly moisture. Hopefully the cylinders are not pitted. I like the idea of welding a breaker handle to an input shaft. I may try this as the next option. Any other ideas feel free to respond. I will keep everyone posted. Thanks again