i assume your engine is a mechanical 3126...My problem is the engine 3126 sending diesel to radiator and lost of power
if so then theres three things that may cause fuel in coolant. from the most likely to the unlikely:
- A cracked fuel injector sleeve. the sleeve is replaceable and it would be wice to replace all six sleeves at the same time. the sleeve replacement procedure requires special tooling. this will affect output power because fuel pressure in the leaking injector sleeve is lower than required and the crack may leak coolant inside the sleeve causing a failed injector.
- A failed fuel cooler (if equipped). if the cooler is installed in the fuel return line it will not affect engine performance directly. if installed on the fuel suction line a failed fuel cooler will leak both ways and will affect engine performance because cooland is being drawn into the fuel system.
- A crack in the cylinder head itself. this is very unlikely since the fuel gallery bore (passage) is the highest chamber in the head casting. if a crack would reach as far as the fuel gallery it would also cause serious coolant and combustion leaks thus leading to reduced engine performance, hard starting etc.
Remember that each and everytime an injector has been removed the bottom sleeve must be machined before assembly!. this also requires a special reamer tool.
hope this helps, cheers!