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Ordered. Should be here by tomorrow. I'll update y'all with results soon. Thanks.

UPDATE: I put a C-clamp on the bypass tube to force the water pump to pump up to the radiator. I got pulsing flow that had bubbles in it. My diagnosis is that the water pump is working at least somewhat and that it has a bad head gasket. Any opinions?

Thank you for the explanation of coolant flow. That's very helpful. Based on this, if the bypass pipe were blocked off/plugged so that coolant couldn't flow from the water flange back down to the pump, would coolant then be pumped up into the upper radiator hose, therefore confirming that the...

I suppose I was assuming it would cause the coolant to flow to the radiator (I really have no idea how this thing is plumbed. I'd really like to understand where coolant flows within and into and out of the block...). The engine was getting too hot when I had the thermostat installed, top of...

Thanks again. So I'm looking at ordering the Genuine Kubota part but I'm finding very different prices. One is from Coleman Equipment for $128, another from Messicks at $205, Kubota Generators Direct at $141, and $255 from my local dealer. Has anyone had any experience from any of these places...

Gentlemen, Thank you for confirming. Guess I'll have to order one. I've learned from those on here to go OEM due to impeller clearance issues but dang, $200+ 🤑

UPDATE: to see if the water pump had failed, I temporarily replaced the upper radiator hose with a clear one and removed the thermostat. The coolant was NOT flowing. Does this mean the water pump is bad OR will coolant not flow right away after start up? I left it idling a minute or two and NO...

Thanks everyone for the feedback. I ordered the correct radiator cap and plan to do some flushing of the radiator and block tonight. Re: the Battery. What smaller battery do y'all use? The one in there seems to fit the bottom bracket and I have read about folks re-locating the battery to the...

Thanks y'all. Ran at low rpm for 10 min. w/distilled water. Upper radiator hose 140F, lower hose 118F. My radiator cap says 7psi. Is that correct? Attaching some photos. PO put what appears to be a non-oem thermostat housing on there. All screens are clean and airflow coming into the "air...

Thanks for responding. Any tips on getting the valve out of the block? I'll get a photo in the morning if that helps.

Hi Everyone, Largely thanks to this forum I bought an early 90s G5200 that was supposedly restored. Unfortunately she overheats and as I started digging into the laundry list of potential causes, I've found that the coolant stop cock on the block is completely clogged with scale/gunk (I know...