Picked up this head a few years ago from machine shop. Off a TD6. Customer never came back to pick up. Fully reconditioned. I never looked at it much. Just tucked it away.
Got it out to put on a SMD I have and noticed this brass plug blocking off large, injector side water passage between cyls 1 and 2. You can see there was some pinning done around it, probably to fix a crack. My question is: Is this an unfinished fix of the crack around the water port? Was it a homemade way to redirect coolant flow? Should I drill it out? This tractor still had the restrictor plates on all 4 of the large coolant passages going into the block so I'm not sure if I should leave restrictor out of that hole and use the rest? Has anyone else ever seen this?