D7 17A Pony motor crank case flooding.

This is a weird one. I am getting water in the crankcase. Yesterday I saw the oil had become cloudy (a sign of water). When I drained the crankcase water first came out. It was clear, no colorant or smell. I let it drain for a long time and refilled.

When I started it the first thing that happened is that oil and water blew out the dipstick hole then it it stopped doing that and ran well.

When I shut it down it was a water and oil mix again, but it ran well and started the diesel.

The radiator level is not changing and I use Caterpillar's red coolant. I am trying to figure out two things:
1. How can that much water suddenly enter the crankcase on startup and then seemingly stop. It is like a slug of water enters and then stops.
2. What is the source of the water? The exhaust has a rain cap. The radiator level is constant. Water has gotten into the gearbox too. But that I attribute to the very worn bushings and seals on the lever shafts. However it gets in, it seems to only happen at startup.

Any thoughts or experiences would be appreciated.

If your radiator have bubble when is running it could be a crack head if no bubble it should be a crack sleeve or brooken sleeve oring

Are there sleeves in the pony engine? Remember the title is Pony Engine. The main engine is fine. The weird thing is that at startup with a fresh oil change the water comes in almost instantly blowing oil/water out the dipstick and then it runs fine.

Sorry The poney have no sleeve and it should be a crack head or head gasket broke or bad water circulation

When I first crank the pony engine the dipstick wants to blow out. That is when the water comes in . After that it settles down. Clear exhaust and runs good.

Not sure what you mean by bad water circulation.

The poney have some hole for water circulation and these hole could be cloggel and the block could be crack too

If you have coolant/antifreeze in the diesel engine and you have clear water in pony that would most likely be condensation. No other part of the tractor has water get in the pony. I am not as familiar with your side mount pony, but the opposed on D2,4,and 6 are notaries for having rust and any other gunk settle out in the passages of the pony. The smaller ponys need the head pulled and the passages cleaned far more often than most are.

From my experience with your type of pony there is a big o ring that seals pony to diesel blokes that can fail. But that be coolant not clear water.

9G-D7 - starting engine crankcase always had water in it, petcocks on bottom open, drain water before starting, then the oil would become milky after start up. Even very short time with the Starting Engine Running. Remember these do not have their own cooling system but rely upon the diesel's water pump and coolant system. Besides gasket issue at the head, there is another place that water can enter the crankcase. That is a crack in the starting engine block. The 9G in this case had experienced freeze damage and a crack was located behind the valve stems in the block. Something to check if your starting engine is "making" white oil in the crankcase. Every minute the diesel is turning, water is circulating through the starting engine. -- cts

My guess is that rain water is finding it's way down the hand crank shaft and through the seal into the right angle adaptor. A small amount of water holds in the drive adaptor when you change the oil and mixes through each time you run the engine. I've had the same thing happen with my one, the seal is easy to replace.