jamesm113 Posted January 30, 2011 Share Posted January 30, 2011 As I understand, there were three iterations of this part - the plastic, aluminium and steel. My car had 11831AA150 put in in 2007, is that the plastic, steel or aluminium part? Is new steel part susceptible to leaking? Thanks Quote Link to comment Share on other sites More sharing options...
lmdew Posted January 31, 2011 Share Posted January 31, 2011 I don't know which one you have: Aluminum is best, IMHO as it expands as the same rate as the engine. Steel and Plastic are both going to move at slightly different rates to the engine block. All 3 are OK if they are pulled, cleaned and resealed with quality RTV and the screws put in will lock-tight. Quote Link to comment Share on other sites More sharing options...
Mike104 Posted January 31, 2011 Share Posted January 31, 2011 There are three part numbers identified here: http://opposedforces.com/parts/legacy/us_b11/type_45/engine/cylinder_block/illustration_1/ In order they list the following P/N's: 11831AA080 (Plastic) 11831AA150 11831AA210 The last part number is the only currently offered for sale by Subaru Dealers. From this photo of the 210 it looks like steel: I would say you do not have the plastic one installed. I don't remember if the aluminum one came before or after the plastic one. Quote Link to comment Share on other sites More sharing options...
987687 Posted February 1, 2011 Share Posted February 1, 2011 (edited) I don't know which one you have: Aluminum is best, IMHO as it expands as the same rate as the engine. Steel and Plastic are both going to move at slightly different rates to the engine block. All 3 are OK if they are pulled, cleaned and resealed with quality RTV and the screws put in will lock-tight. The steel one is the latest revision, and said to be the best. That's what I'm getting for my EJ22 swap engine. It currently has the aluminum one, but for such a cheap part, why risk pulling the engine again? All three are NOT ok, the plastic ones crack. That's not good. Don't re-use a plastic one. Edited February 1, 2011 by 987687 Quote Link to comment Share on other sites More sharing options...
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