...Engine. Starts Fine.? I am building a 4x4. Recently had an engine replaced in it with a Toyota 3C-T Turbo Diesel. It starts fine. Revs good. No Smoke in Exhaust. No coolant in the engine oil. No overheating under light conditions. No exhaust bubbles in the radiator. But every-time I have taken it off-road which places load on the engine; I have noticed oil in the radiator and loss of coolant in the radiator. I have been continuously monitoring this. It is a manual engine so there are no transmission cooler. Also have taken out the oil cooler next to the filter. I have also bypassed the coolant from the Turbo to rule out the possibility. Does this mean the head gasket is broken? Is the cylinder block cracked?