1550 Head Questions

Drug this 1550 home today to save it from the scrapper. Was parked under cover 10-15 years ago because of a "cracked head". PO bought another head, but did not install it because it did not have the water port at the front of the head in order to run coolant water to the 2 speed. I'll take the original head to the machinist and have it checked for cracks for certain, but am curious if I can use the other head and just tap a hole for the 2 speed coolant?

Tractor s/n is 169018-504, original head number is either 186402K or 188402k, can't tell for certain. Replacement head is 186402, but does not have the coolant port. Block casting number is 160918A.

Assuming the original head turns out to be bad, should I try to use the other head the PO had purchased and tap a hole in it, or should I try to find another head with correct features?
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I would be curious where the cracks are, seeing that your 1550 is a precombustion chamber diesel. Cracks are common
and usually not harmful.

Could be the previous owner needed to get a second opinion.
 
O. K. First of all going by memory, but early heads have smaller valves than later heads just like a 550. Get the head pressure tested to see if it leaks. Also the Oliver part number (six digits +As) will be stamped over on a machined surface of the left (exhaust manifold) side of the head. Look for those numbers on the heads. Questions? J.
 
I'd try to get the tractor going first,I bought a 1550 diesel awhile back that the owner said it had a bad head 'or something' as they had a head job done and never could get it started so they pull it back in the woods.The reason it never started was they never had fuel to the injection pump and they were using a car battery on one side and a huge 6 volt on the other I checked it over and we pull it about 100ft fired off and ran fine even with 4 year old fuel in it.So you might get lucky.
 
Got a chance to look at the head tonight and feel pretty confident that it wasn't a crack that caused this thing to be parked. The pics are of the 3rd and 5th cylinder areas. Looks like cavitation to me, but what do you think? This looks to me like something that happened over time, right? Also took a pic of the head casting numbers. You were right about the earlier head having much smaller valves. I guess this all means that I'm in the market for another 1550 diesel head.
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