Drain Radiator From The Block ? Farmnall H 1940

This is a picture of the plug near the carburetor on my 1941 Farmall H.

Is this the drain plug. I flushed the radiator, new hoses, and thermostat. Can I drain the rest of the fluid from the block by the screw plug as in this picture.
30062.jpg
 
I would take the water cover off, remove that plug and power wash good around all the cylinders.
 
(quoted from post at 11:17:30 11/15/15) I would take the water cover off, remove that plug and power wash good around all the cylinders.

You mean actually use a pressure washer. How much pressure. Where is the water cover. It that the cover just above the drain plug on the side. Will I need to new gasket or sealer to put the cover back on. What am I pressure washing, whats under the water cover.
 
Yes, the sheet metal cover behind the carburetor. When it comes off you will see the outside of the cylinders. The more pressure the better from a pressure washer to knock off scale and blow it back out of the engine. You will need a new gasket and likely a new cover. There are water diverters on the inside that are probably rusted off, they are not essential but nice to have and replacement covers are not too high. When you take the cover off you may see lots of scale and that may be the reason you cleaned the radiator.
 
You are looking right into the water jacket inside the block. It is all thick cast iron, so you will not hurt anything to poke around. I took the wand on mine and washed all around the outside of the
cylinders, make sure and poke it in everywhere. The gunk will come out the block drain.
 
Here is what Farmall H block looks like with the coolant header removed. This engine block was full of scale from hard water being used, & was overheating. I used muriatic acid to break up the scale, then magnetic to remove scale. Coolant temp's normal now. Not saying you have this problem, but its worth a look.

006_zps30567784.jpg
[/img]
 
No/yes== the process sprays high pressure water into the water jacket (where there is normally coolant) so it does get water in the engine, but not where it does not belong. (recommended procedure is to not over tighten the cover bolts, and use pipe sealer on them when installing to avoid leaks at their threads). Jim
 
(quoted from post at 20:42:31 11/15/15) In the pic, can see the acid & water mix. It did a great job in cleaning the block.

I see a the water cover, it looks like there is one on both side of the tractor. Do you take both off or just the one on the carburetor side. Also, do I need to take the exhaust/header off as in your picture. Is it necessary to take the exhaust/header to do this radiator/water cover cleaning. Does that exhaust/header ports need pressure washed as well. I'm a little confused on that part.......
 
(quoted from post at 20:42:31 11/15/15) In the pic, can see the acid & water mix. It did a great job in cleaning the block.
I also see you have a hose coming from your drain plug. What the purpose of that.
 
You do not need to remove the intake/exhaust manifold to get the coolant header off. It does make it easier, but no. Reason its off, on this engine the cylinder head was full of scale. So I removed the cylinder head after cleaning out the block. This engine was having series over heating problems, are you having overheating issues? I installed the hose to drain the block after using the acid/water to break up the scale. Didn't want acid/water to drain all over the floor. I just drained into a bucket. Hose is gone now, plug is back in the block. The plate that's on the distributor side of the engine is for access to the tappets. No need to take it off.
 
The pressure washer suggestion is good idea, you will get wet thou. I did that after got scale out of the block. I took the hoses off so nothing would go into the rad that I just had clean @ the rad shop.
 
(quoted from post at 19:50:21 11/16/15) The pressure washer suggestion is good idea, you will get wet thou. I did that after got scale out of the block. I took the hoses off so nothing would go into the rad that I just had clean @ the rad shop.

What type acid are your using and how do you apply it and leave in on. You talking about muratic acid.
 
(quoted from post at 19:40:36 11/16/15) You do not need to remove the intake/exhaust manifold to get the coolant header off. It does make it easier, but no. Reason its off, on this engine the cylinder head was full of scale. So I removed the cylinder head after cleaning out the block. This engine was having series over heating problems, are you having overheating issues? I installed the hose to drain the block after using the acid/water to break up the scale. Didn't want acid/water to drain all over the floor. I just drained into a bucket. Hose is gone now, plug is back in the block. The plate that's on the distributor side of the engine is for access to the tappets. No need to take it off.

I don't know if I am having overheating problems. I bought the tractor at an estate sale a couple years ago. The old man was 90 years old and his father bought it new in 1941. I ran it a few times and then realized there was no temperature gauge and the oil gauge was questionable. They told me it was taken care of by the original owner. Its all original with kerosene tank, original 6volt, vents in front of the radiator. So I am now getting back into it. New sediment bowl, oil change, thermostat. I have to clean the rust out of the tank now. I think it was ok until I let it set up the last few years with no gas in it. But I was wandering why there was no temperature gauge. It had the original thermostat (which was a real good beefy thermostat) compared with the one I bought from external link Supply as its new replacement. Maybe the guy was running it without a temp gauge. So Im not taking any chances now and fixing and replacing some key things.
 
Is your engine overheating? This H my Dad brought was badly. Have you removed the coolant header yet? When I took the header, all I could see was scale build up. I pushed a screw driver thru about 4" of scale till I got to the bottom of the cylinders. I brought a gallon of muriatic acid, mixed with water like the jug said to. Then drained it out the hose that's in previous picture I posted. The acid would break the scale up, then used a magnetic to pick up the scale. Did this for a week each day. Then pressure washed block out, removed the cylinder head. It was full of scale also, scale fell out just moving the head around. Put all back together, engine does not overheat anymore. But if your engine is not overheating you will not need to go thru all this that I did.
 
(quoted from post at 21:34:13 11/18/15) Is your engine overheating? This H my Dad brought was badly. Have you removed the coolant header yet? When I took the header, all I could see was scale build up. I pushed a screw driver thru about 4" of scale till I got to the bottom of the cylinders. I brought a gallon of muriatic acid, mixed with water like the jug said to. Then drained it out the hose that's in previous picture I posted. The acid would break the scale up, then used a magnetic to pick up the scale. Did this for a week each day. Then pressure washed block out, removed the cylinder head. It was full of scale also, scale fell out just moving the head around. Put all back together, engine does not overheat anymore. But if your engine is not overheating you will not need to go thru all this that I did.

I don't know if it was overheating. I bought it at an estate auction. The temp gauge wasnt on it, and Im not sure if the old oil gauge works. One family owned it the whole time since 1941. Its all original 6 volt with shutters, kerosesn fuel tank etc., was running when I bought it, but I didn't run it much since there was no gauges. Nobody in the family was left to ask any questions. So I dont even know if detergent oil or non detergent oil was used in it. Im new to the tractor world so Im learning.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top