On chain driven Subaru's head gasket failure is not as common, however it can still occur. One of the common signs of head gasket failure is coolant mixing into the engine oil. Another sign is the engine overheating, when no other cooling system issues are present. The cause of head gasket failure on chain driven Subaru engines is primarily due to overheating the engine, which then causes the cylinder head to warp. Similar to the belt driven Subaru engines, we replace the head gasket with a factory head gasket from Subaru, take the cylinder heads to a machine shop to have resurfaced, and install the head to the engine using factory specifications. We also complete an engine reseal of important components including camshaft carrier, timing cover, valve cover gaskets, and also install new spark plugs. At this time, we also recommend doing an upper oil pan reseal, as this is a common failure point on this engine and also requires the engine to be removed from the vehicle to be complete. This will ensure you have tens of thousands of miles to enjoy your Subaru.
Subaru timing belts need to be replaced after seven years or 105,000 miles; whichever comes first. Timing Chains do not require to be changed as often, sometimes they are good for the life of the vehicle. If you have a question of whether your Subaru has a Timing Belt or Timing Chain, we can answer that for you by giving us a call at 303-733-4544. As a general rule, all H6 Subaru's are timing chain, all Outbacks 2013 and newer are timing chain regardless of engine size. Forester started the timing chain engine 2011 and newer and Impreza NA, Crosstrek saw the timing chain introduced in 2012 and newer model cars. All others can be considered to be timing belt cars.