ok, i've took the pistons out of the block, i put them in order ready to mark as 1/2 & so on. but i kicked them, know they have right & left on them. but at the bottom of each piston, theres eather an 'a' or an 'b'.

so which pot does each go 'a' to the back or 'b'
and is it the same for the right side to the left.
please help.

 

Using logic here! If you took one circlip out from each side, and left the other clip in, you might be able to figure out which way they go back if you know which side they came out of!

 

the problem is, i only noticed the letters after cleaning them.
other wise i would have thought that to.

i took all the clips out so i could clean the pistons.

 

Doh!

 

call hdc subaru (Howard) ask him as he rebuilds them day after day 01422 846868

 

i've just kind of read, there is a very slight difference in size from pist 'a' to piston 'b', is this true

does this mean the block is different to match each piston
i need to know how to sort this problem out.
thanks

 

i'll give him a buzz mate. thanks for that

 

if you call now he might still be there

 

just rang, but he gone home. need to ring back at 8 in the morning.

 

If you look on the top of the block, each bore is marked with either an "A", or a "B".

So all you can really do at this point is make sure A's go in A bores, and B's go in B bores.

There should also be a dot on each piston, and this should point towards the front on all of the pistons.

Did you take the rings out too, and have they also been mixed up ?

If so, I'd get the bored honed, and new rings.


Mark.

 

no mate, the rings are fine. does this go for all subaru pistons mate, i'm going to have a look. thanks for that.

 

As Mark described, and if you have "kicked" them - make sure the skirts,crowns + ring lands have not been marked or damaged.

 

just checked, its right at the top of the block in the centre. is that it, your a life saver mate.

why diden't scoobyclinic say anything like that. i asked them about getting a set of sti v4 pistons. they said some thing about some being 'a' & some being 'b', but they said i can not get it right as there are 'c' pistons too. but should it be the same for the sti pistons too, being eather 'a' or 'b'.
well thanks again

 

no mate, there fine. when i say kicked them, it was more like tapped them but there was on a quilt. just incase any oil went on the floor.

i'll be selling the pistons soon, how much can you get for them