stuck 400 gas tractor engine

[Anonymous-0]

I know it has been talked about before,but how do you determine which piston is stuck without taking off the head first?Want to try the grease gun thing but was wondering ,do you do it to more that 1 cylinder(one that is up)or more than 1.Thanks for any advice you can give.Dave a

 

[old]

Can be very hard to tell. Either way I ALWAYS do the transmission fluid thing first and let it sit for a few weeks. One way to maybe tell which one is the problem is if the spark plug in that cylinder is very rusty but that only works about 50% of the time
Hobby farm

 

[caseman-d]

Could fill al the cylinders with fluid and see if one never gets lower, or possibly pull the pan pff and look for a rusty sleeve. Now does the 400 have inspection covers like the D series ???
caseman-d

 

[Pat T]

It may well be stuck on the cylinder(s) with the exhaust valve open - open to the elements and moisture. You could remove the valve covers to see and maybe get an idea. Good luck with it, patience is a virtue here!

 

[Anonymous-0]

The 2 major causes of engine siezure are overheat where the rings actually weld themselves to the cylinder walls with heat fusion or moisture into the cylinder from a leaky head or rain/snow thru the exhaust stack and then thru the valve causing the rings to rust to the cylinder.After an overheat siezure it is wise to pull the head and do a good assessment of the damage.For rust siezure pour about 2 quarts of diesl fuel with a cup full of transmission oil into the exhaust manifold and let it sit for about 48 hours.Pull start the tractor and there will be a 90% chance that it will free up.Generally there is no ring or cylinder damage and after a quick oil change it is good to go.I did this to my 930 case 2 years ago and have put a couple of hundred hours on it since