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Discussion Starter #1
Hey all, new member, nice to be here.

I've got a 2002 Outback with the 2.5 SOHC non-turbo engine. I recently had the timing belt jump on me. Towed it home and started getting into it.

Removed timing belt cover and it looks like one of the idlers lost a couple ball bearings. I imagine this created slack allowing belt to jump. I wanted to reset the cam sprockets to the proper timing so I set TDC (intake) on the balancer removed the belt and started trying to adjust cam. Was able to get passenger side sprocket in the proper position but when I try to adjust the driver's side sprocket I encounter resistance and notice the crank sprocket rotates too.

Have i overlooked something/made a mistake? Or does this mean the valves met the piston when the belt jumped?

Thanks in advance.
 

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1999 30th Anniversary Legacy Outback DOHC 2.5L 4EAT, 2008 Impreza WRX 2.5L 5MT, 2008 Impreza Wagon 2.5L 4EAT
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Subaru doesn't use TDC position when setting timing. Use the alignment marks on the cams and crankshaft

Crankshaft timing mark




Passenger side camshaft


Drivers side cam shaft
 

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Discussion Starter #3
Thank you for the quick reply, I was following instructions in the Chilton manual and assumed timing was based off TDC. I just went out and was able to orient all three marks in their proper position.
 

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Discussion Starter #4
Follow up question, how likely is it there was valve damage when the belt skipped? I'm hoping to test before buying a new timing belt kit. But wondering the best way to go about it?

What i was imagining is, with the marks back in alignment, reinstalling the old belt and turning the engine over to tdc where I can then run a leak down test.

Do you guys think it would be safe, with the old belt back in place to run a quick compression test? Or am I running a risk of jumping timing again and damaging valves that might be ok?
 

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1999 30th Anniversary Legacy Outback DOHC 2.5L 4EAT, 2008 Impreza WRX 2.5L 5MT, 2008 Impreza Wagon 2.5L 4EAT
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Slap on the old belt with a replacement idler and turn it over
 

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Outback 2011 3.6R Premium
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If the belt only jumped a few teeth then the chance of damage is low.

As suggested above install a new idler and turn it over.

Seagrass
 

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And by "turn it over", we mean "by hand for two full revolutions using a breaker bar on the crank socket". If that is successful, then, and only then use the electric starter.
 

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Discussion Starter #10
Update here:
  1. Got the timing set and the old belt back in place. Ran a compression test to find 50psi on cylinders 2+4 and 0psi on cylinders 1+3. Unless im overlooking something it seems to me there was valve/piston damage when the timing jumped.
 

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1999 30th Anniversary Legacy Outback DOHC 2.5L 4EAT, 2008 Impreza WRX 2.5L 5MT, 2008 Impreza Wagon 2.5L 4EAT
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Update here:
  1. Got the timing set and the old belt back in place. Ran a compression test to find 50psi on cylinders 2+4 and 0psi on cylinders 1+3. Unless im overlooking something it seems to me there was valve/piston damage when the timing jumped.
That would be my thoughts. Either take the heads off and send them out or drop in a used engine or a JDM EJ20 engine
 
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