My D7E Ser#48A7052 arrived last week. I knew it had some head trouble when I bought it. The previous owner said that it started blowing water out of the turbo and had attempted to fix it. After a short Q&A, my suspicions were confirmed that they just had enough of spending money with no real results in fixing the problem. They removed and replaced the reworked heads TWICE!(Same heads just rebuilt) Anyway, we were able to get the pony started. The diesel block is stuck so we've got some work to do there. We moved straight on to removing the heads since we couldn't turn the big motor.(Decomp open of course) The intake and cylinders were full of water from the head trouble. Upon removing the heads, we noticed that the gaskets looked good. Also, both heads have all new parts assembled in them. The next day, my dad cleaned the heads good and waited for them to dry out from the hot Georgia sun. We generally do this just so we might have an idea as to whether it's even worth the trouble to have the head shop pressure test. Upon quick inspection, he noticed cracks around the PC chambers in the same spot on both heads for #2 and #4. So, in searching for replacement heads, I notice that there appear to be two different casting #'s available. Mine are 1M2960. I see a lot of heads online that seem to cross to a 4N7000. Any body have a clue as to why there are two different casting #'s? Did CAT find a lot of cracked 1M2960's? I'm currently shopping for availability and cost vs. repairing these heads. But, I don't want to just repair heads that were inferior in the first place. Thoughts? Thanks, Zane
[attachment=30406]Number2CylinderHeadCrack.jpg[/attachment][attachment=30407]Number4CylinderHeadCrack.jpg[/attachment]
