|This is a picture of the most common Subaru engine, the 2.5 liter 4 cylinder. This engine can be found in all 2000-2010 outbacks legacys, impresza’s, & foresters & later on some models. If your car is a turbo or an H6 a lot of these principals will be the same but the costs are higher.
This particular engine came from a 2006 Impreza & has some updates, but nothing that will concern us for this posting.
The suggested interval for Subarus timing belt replacement is every 105,000 miles. People call us and ask “How much does it cost to do this job?”
IF… we JUST replace the timing belt by itself, it’s just under $400.00.
BUT…. notice all those pulleys that belt goes around?
They have all been spinning at the same RPM as the engine, for the same 105,000 miles. Those pulleys should be replaced at the same time.
|This is a picture of the upper Idler pulley on the passenger side of the engine. Notice the Black outer seal face & it’s distance in relation to the face of the pulley itself. This tells us it is a 2 row bearing pulley, one row of bearings towards the front & another towards the rear.||This pulley is located on the passenger lower side of the engine. Notice the red (sometimes green if it’s been replaced before) face of the pulley & it’s distance to the face of it’s pulley. This indicates it’s a single row bearing. We see these single row bearing pulleys fail a lot. More is better, right? In this case it’s definitely true. Why wouldn’t you upgrade to a double row bearing, especially if the cost is just a few dollars more per pulley?||This shows another single row red faced bearing pulley. This one, along with the others are called “Idler” pulleys as they guide the belt & don’t “drive” anything during the rotation of the belt. The solid looking pulley is the water pump pulley. This means that if you didn’t replace it at the same time as the belt & you might have to tear everything back apart (or pay someone) to replace it if it were to start leaking.||This is the timing belt tensioner pulley assembly. Its job is to take up the slack & keep the belt tensioned as the belt stretches over time. Subaru has made enough updates to this part that we don’t trust it to outlast any of the others. It too would be replaced during one of our “proper” t/belt jobs.|