Honda Engine >> OIL IN THE COOLING SYSTEM
Honda Engine >> OIL IN THE COOLING SYSTEM
Oil In The Cooling System On
Honda 1.8L Engines
AERA members have reported engine oil in the cooling system on Honda 1.8L engines. The cause of this condition may be from an internal crack in the cylinder head from engine overheating. This particular crack may be occasionally overlooked, as it is in a concealed area.
The location of the crack is directly below the center camshaft bearing bore of the cylinder head in a cast line near the radius where the casting rises to form the cam bore. A crack in this location may be overlooked in a dye-penetrant test, as the indication may be thought to be the cast line. Pressure testing the head will reveal the length of the crack which will extend to the adjacent head bolt hole. That hole carries pressurized oil to feedthe rocker arm assembly and camshaft.
Only limited amounts of coolant will enter the engine oil supply with this type of crack, as that area remains submerged with engine oil after the engine is shut off. Successful repair of this type of crack is generally made by welding or pinning the cracked area and machining the affected areas.
The AERA Technical Committee
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