John Deere 4650 tractor. 466 engine is ( suspected) hydraulic-ed. Coolant in a cylinder??? Suspected cracked head/liner, bad gasket or cavitated liner. I'm currently in the process of stripping it down to remove the head to check it out. Anything special to look out for as I go about stripping hardware of it. I'm at the point of removing the intercooler. Presume that after I remove mounting bolts and tubes it can be pulled off of the turbo at the joint. Presume there's an O-ring seal there or something? Not looking forward to removing the exhaust manifold as I'm sure there will be some stubborn bolts that'll break off. Any advice much appreciated.