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Re: Brand new problem (scary!)
in theory that is a good idea but that is probably not why your belt jumped. being in Colorado I see tons of subarus, many are missing this part and never have a problem. If the belt is in good condition I would suspect a misfire issue caused the cam to push back and cause the belt to jump. the rotating mass of the cam is enough to keep it from pushing back against the belt and when the belt is pulling it should always be tight. could also be a bad tensioner but was trying to ignore the obvious as I assume they checked that stuff out.
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Current Stable:
1992 SVX
1979 K5 Blazer Cheyenne
1956 Plymouth Belvedere - Daisy
1967 Chevy C20
1953 Chevy 210
1969 Plymouth Satellite
1949 Chevy Thriftmaster
1959 Chevy Apache
1951 Chevy Stepside
1969 Chevy Camper Special
1978 Ford F150 w/ stroked 460
1986 Volvo 740 turbo wagon
1999 GMC 2500 Creep Van
1994 Impreza Outback
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