Replaced exhaust manifold gasket and antifreeze poured out

I replaced the exhaust gaskets on my 8N. While removing the four bolts that held the manifold, some antifreeze came
pouring out of one of the bolt holes. Just prior to doing a gasket change, the tractor overheated, so I thought it
was a good time to change the exhaust gaskets since I had to let the tractor cool down anyway.Does antifreeze
normally come out of the holes when the exhaust manifold gets removed? A lot of antifreeze came pouring out of the
wall when I removed the exhaust manifold. Is something really wrong with the tractor?

My little 284 IH does that too. Bolt holes are drilled thru.

Allan

Some of the manifold bolt/stud holes extend through the block casting into the water jacket.

Clean the threads and use thread sealant when going back together.

Ease of manufacturing. Its not much fun to drill and tap blind hole as it is to do through hole. Blind hole cause more tap breakage, hence assembly line machining interruptions.

You'll find head studs/bolts do same thing

Thanks to Howdy, Barry, Bob, and Allan. I just thought when I removed the exhaust manifold, that I surely had a cracked block since my tractor overheated to begin with. I just installed a new thermostat last year ( the proper way I made sure), so why the overheat issue then? Could it be the water pump? How can I test a water pump. Oh, one last thing...when I noticed the tractor forcing steam out the radiator cap, I stopped the 8N, let it cool a little bit by opening the rad cap slightly, then with my shoe in hand, opened the radiator cap all the way, and it spewed out antifreeze over 3 feet in the air straight up. I also need to check the thermostat to be sure it opens in boiling water. But again, how do I test the water pump?

Sounds like you may have a blown head gasket--leaking compression into the water jacket. Also, it could have a cracked head.

If an 8N is a flathead [weren't they all?]...the manifold doesn't bolt to the head.

It's very rare for a water pump to fail to move water.

Typically when a water pump "fails", it will leak, and maybe the bearings will get loose and it will rattle around, but it will still pump.

A good way to tell if the pump is working, and the coolant is circulating, is to fill the radiator, get the engine up to temperature, fast idle the engine, and carefully look into the radiator to see the coolant circulating. Also if the radiator tank is hot to the touch, and the air coming through the radiator is warm, the pump is circulating coolant.

Sounds like your tractor got really hot for it to send water and steam that hard out the cap. Any possibility the radiator is clogged with grass? Another possibility is the radiator is clogged internally. This can be detected by feeling the front of the core. It should feel equally hot side to side without any cold spots, warmer at the top, cooler as you go down, but still equal side to side.

As you said, check the thermostat.

But good possibility the head gasket is leaking. Evidence is mystery coolant loss with no external leak. Steam out the exhaust on a warm day. Radiator pressurizing quickly, even before the engine is up to temp. also blowing pressure out the cap. Engine miss, or difficulty with the starter turning the engine, (liquid lock). You can also let it sit overnight, pull the plugs, crank it through and watch for water to blow from a cylinder.

Hi Steve@Advance,
You surely covered a lot of good common sense items I need to check. It's possible the grass I cut is clogging the radiator so proper airflow may be limited. I'll also pull rad cap to see if it opens in boiling water, and see if exhaust pipe blows moisture out it's tail, and moisture out the plugs for a cracked block, hot/cold spots on radiator itself...what great tips. Thanks Steve

I know this suggestion sounds like an insult to your intelligence, so please don't take it that way- I have learned this from experience. If it is overheating, check your fan belt tension. A slack belt can slow a water pump down to the point that it will not flow enough without any squeal or noise. I am not ashamed to admit that this has happened to me more than once. They tend to get overlooked on tractors until the generator/alternator stops charging enough or you have overheating problems.

Hello Wesley, I take no offense at all, and to tell the truth, I never even thought about the belt possibly being
loose...great tip. I'm guessing a wiggle of the belt of not more than a half inch should be the mark of acceptance,
anything more should be tightened. I'll add the tip to my list of possibilities.
Respectfully,
Philip