Farmboy4221

New User
Hey All I have a farmall H I just got my hands on previous owner just had a different head put on the engine and all the valves gone through it smokes a little blue and oil pressure is low after it warms up according to my gauge I haven't threaded a psi gauge in yet but I'm thinking rings and bearings is my issue??? I know this isn't the correct way of thinking because I am a Ag mechanic myself and I know it would be a bear but I'm up for the challenge has anyone attempted removing pistons and rods out the bottom of the block to install rings and put back together my old F-20 has plenty of room for this task I know it's not the politically correct way to install new rings I just want to kno if is actually possible thanks in advance guys!!!!!
 
It will not allow the pistons to get past the crank. if the crank is out, the ehgine is out, so why not go with a gasket. Checking cylinder sleeve wear is very difficult with the head on. Jim
 

It just doesn't make sense.....but ok.

If it where possible to even get them out, getting them ack in would be the trick, haha.

I imagine you had the answer before the question....
 
No don't do that. How would you ream the ridge at the top of the cylinder? You don't want your new rings smacking the ridge! How would you set up a ring compressor?
 
Dad has removed and installed pistons in Massey Harris 44 special diesels. Not in a farmall h to my knowledge.
 
I don't think there was enough room for the piston to come down and wiggle past the crank, maybe am wrong. I have unbolted the rods and had to pound out a stuck piston from the bottom, up out the top. And that is hard to swing a hammer up like that. I had the head off, and if it would have pounded down I surely would have taken that path.
 
Pull the head and see if there's a ridge at the top of the sleeve. You may need a ridge reamer. Drain the oil and remove the oil pan. You can remove the rods and pistons out the top. Hal
 
Before spending money, put some Marvel Mystery Oil or Sea Foam in the fuel and run two or three tanks through it. You may free up the rings. Put some 20w50 oil in it after you know what oil pressure it is carrying hot.

A little blue smoke clears out mosquitoes. It will probably run for many years just like it is.
 
Careful about that word "ag mechanic" cause anybody with knowlege knows you cant remove a piston from the bottom with the crank still in the engine
 
Possibly if he could do it with f series why not ask on H. I have replaced pistons and rings on a d and c series case. with out removing head. Agreed not usually fees able , Had DC case Babbitt rod fail second year of farming. No money extra and crop to put out. In one hour rod replaced from parts tractor, back in field through hand holes.
 
Could even throw in a Z Moline here. The head (if you want to call it that) is on the side of block. The cylinders are dead end so piston has to come out the bottom. I haven't been around enough of them to know if they will come out without removing the crank but am willing to wager a little that they will. Tough to remove the ridge also.
 
H has a center bearing crankshaft, F20s have open center crank with the ball bearings at each end of crankshaft so there is room to pull pistons from bottom of F20s while H has interference with crankshaft bolted tight- might be able to do last bit of wiggle with crankshaft bearings unbolted? ridge reaming from bottom pull usually require a long handle reamer/cutter- they exist but not usually a normal stocking item at the tool counters. Aircraft mechs for the old radial engine may have some in their tool kit. Some ring kits will have a top 'service' ring with a step or taper at their top, designed to go into a 'unreamed' cylinder. Ring compressor for the bottom install piston can be a short sided oversize hose clamp or the usual longer sleeve rig with close clearance side clamp screw instead of long side handle and strap. Some hydraulic cylinder and pistons with a 'ring' use these compressors as well as some old steam cylinders. Have fun. RN.
 

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