A blown head gasket in a turbo model usually indicates a replacement engine. Engines EJ 205, 207, 255, and 257 DOHC 4-cylinder turbo from 1991-current, causes and options Internal head gasket leaks in turbo models are usually caused by problems with one or more of the peripheral components, such as excessive turbo boost, failure of cooling fans, defective wiring, radiator leaks and blocked radiator cores. However, we have also seen an increase of liberty/Outback H6 EZ engines with internal defective gaskets at about 150 to 200 000km. Over the years we have not seen many non-turbo models with internal head gasket issues, while we have replaced many turbo WRX, STI, Liberty RS ¬¬, Forester GT/XT head gaskets, and if in the advanced stages, provided exchange engines. If the gasket fails in this way, a variety of problems can occur, from compression loss (leading to power reduction, or a rough running engine), to exhaust gases being forced into the cooling system, leading to the engine overheating and increased engine wear due to the motor oil being mixed with coolant. Occasionally, there will be a compression leak in the gasket, which will have to be replaced, before severe damage occurs. Either of these may cause engine damage and significant operational problems like burning oil and overheating, which may show up as white exhaust smoke. When a head gasket fails it can either leak engine oil to coolant or coolant to the compression chamber. You may see bubbles in the overflow reservoir, or sludgy residue on the walls of the overflow reservoir, or random engine overheating. Due to the extreme range of hot and cold temperatures and pressures on a large surface it is common for head gaskets to leak between chambers over time. The Subaru head gasket has to cope with high internal temperatures and combustion gases under high pressure. It seals both the combustion chambers and the coolant passages in a Subaru engine. It is the most critical gasket in the engine and the most difficult to diagnose. Subaru Internal head gasket leaks (mainly turbo models EJ 205, 207, 255, and 257 The head gasket forms a seal between the Subaru engine block and cylinder head.
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