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Old 08-14-2012, 12:27 PM   #1
Scooby Newbie
Member#: 305565
Join Date: Jan 2012
Location: Gresham, Or
2001 rs impreza

Default ej251 rebuild

Have a bad ring on piston #3, do you have to spilt the block in order to change piston rings? If I have to split the block and hone all the cylinders, what else should be replaced? The engine has 128k.
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Old 08-14-2012, 12:48 PM   #2
Scooby Specialist
Member#: 165749
Join Date: Dec 2007
Chapter/Region: South East
Location: Central Floriderp

Nope. You can remove the pistons by just removing the heads. There is a plug on the front/back of the crankcase to get the wrist pins out. To hone you probably need to split the case because the rod might not go down far enough to hone the entire bore but I am just guessing on that.
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Old 08-14-2012, 02:17 PM   #3
Scooby Specialist
Member#: 154586
Join Date: Jul 2007
Chapter/Region: BAIC
Location: San Ramon
1996 Turbo Outback
9psi on 91 No EM


Like Raceface said;you have to remove the piston before splitting the block. Not sure you can hone it without splitting it either. Why do you suspect #3 rings?
If you have to do a rebuild you might as well just buy a used/good condition sb and swap it in. It isn't worth rebuilding especially if you mess it up and you have to do it twice. (ask me how I know). If you need a sb I know a guy in your area that can get one for you. He is very trustworthy and fair.
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