Can it be determined from the engine number if it is a Phase I or Phase II. Engine #066409. 99 Outback with piston slap. Thanks, Jack
1935 Dodge 1/2 ton pickup 1951 Studebaker Commander Starlight Coupe 1970 VW Karmann Ghia Coupe 1999 Subaru Outback wagon 2001 Mazda Tribute SUV
It's likely Phase II but apparently the hardcore crowd is also having trouble distinguishing between the two:
In any case; to eliminate the slap you'll have to use pistons of a different design with a longer cylindrical sidewall portion (97 and later pistons are "skirtless").
Using OEM pistons is not likely to improve this condition permanently, but after market pistons for the EJ25 are readily available.
florian
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