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    Oil contamination

    Asked by Richard Lyon

    WOULD you troubleshoot the following problem with a 1996 Toyota LandCruiser Series 80 4.5 automatic and LPG? The cooling system is contaminated with oil carry-over to the radiator expansion tank. The cylinder head gasket was thought to be the cause. It has been renewed after the cylinder head was tested and found OK. The cooling system was flushed and the radiator tested OK. The vehicle was put back in service and several cooling-system flushes performed -- problem still not solved. The cylinder head gasket re-checked OK. More flushing. The problem still exists. Could it be transmission oil? Can any simple tests be done to determine the source of oil?

    Answered by CarsGuide

    26 Aug 2004 Graham Smith

    WE PUT your problem to Toyota experts and they say it is difficult to diagnose without seeing the vehicle or the colour of the contamination to determine whether the contamination is engine oil or transmission fluid. There is no mention of any signs of water contamination in either the transmission fluid or engine oil. Likewise, there is no mention of engine overheating. Toyota's guys suggested the following inspection: remove transmission coolant hoses from the radiator, pressurise the cooling system and check for leaks from the radiator where the transmission hoses were removed. Inspect the rear side of the timing-case area near the water pump. Remove the rocker cover to expose the rear side of the timing-case cover (just in front of timing chain). Pressurise the cooling system and check for leaks.

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